HADOOP-13203 S3A: Support fadvise "random" mode for high performance readPositioned() reads. Contributed by Rajesh Balamohan and stevel.
This commit is contained in:
Steve Loughran
parent
67089875f0
commit
4ee3543625
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@ -105,7 +105,10 @@ protected void validatePositionedReadArgs(long position,
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Preconditions.checkArgument(buffer != null, "Null buffer");
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if (buffer.length - offset < length) {
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throw new IndexOutOfBoundsException(
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FSExceptionMessages.TOO_MANY_BYTES_FOR_DEST_BUFFER);
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FSExceptionMessages.TOO_MANY_BYTES_FOR_DEST_BUFFER
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+ ": request length=" + length
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+ ", with offset ="+ offset
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+ "; buffer capacity =" + (buffer.length - offset));
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}
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}
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@ -271,7 +271,7 @@ public void testSeekPastEndOfFileThenReseekAndRead() throws Throwable {
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public void testSeekBigFile() throws Throwable {
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describe("Seek round a large file and verify the bytes are what is expected");
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Path testSeekFile = path("bigseekfile.txt");
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byte[] block = dataset(65536, 0, 255);
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byte[] block = dataset(100 * 1024, 0, 255);
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createFile(getFileSystem(), testSeekFile, false, block);
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instream = getFileSystem().open(testSeekFile);
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assertEquals(0, instream.getPos());
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@ -291,6 +291,15 @@ public void testSeekBigFile() throws Throwable {
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assertEquals("@8191", block[8191], (byte) instream.read());
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instream.seek(0);
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assertEquals("@0", 0, (byte) instream.read());
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// try read & readFully
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instream.seek(0);
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assertEquals(0, instream.getPos());
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instream.read();
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assertEquals(1, instream.getPos());
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byte[] buf = new byte[80 * 1024];
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instream.readFully(1, buf, 0, buf.length);
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assertEquals(1, instream.getPos());
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}
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@Test
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@ -23,6 +23,10 @@
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/**
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* All the constants used with the {@link S3AFileSystem}.
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*
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* Some of the strings are marked as {@code Unstable}. This means
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* that they may be unsupported in future; at which point they will be marked
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* as deprecated and simply ignored.
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*/
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@InterfaceAudience.Public
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@InterfaceStability.Evolving
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@ -154,4 +158,36 @@ private Constants() {
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/** read ahead buffer size to prevent connection re-establishments. */
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public static final String READAHEAD_RANGE = "fs.s3a.readahead.range";
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public static final long DEFAULT_READAHEAD_RANGE = 64 * 1024;
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/**
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* Which input strategy to use for buffering, seeking and similar when
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* reading data.
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* Value: {@value}
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*/
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@InterfaceStability.Unstable
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public static final String INPUT_FADVISE =
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"fs.s3a.experimental.input.fadvise";
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/**
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* General input. Some seeks, some reads.
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* Value: {@value}
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*/
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@InterfaceStability.Unstable
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public static final String INPUT_FADV_NORMAL = "normal";
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/**
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* Optimized for sequential access.
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* Value: {@value}
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*/
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@InterfaceStability.Unstable
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public static final String INPUT_FADV_SEQUENTIAL = "sequential";
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/**
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* Optimized purely for random seek+read/positionedRead operations;
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* The performance of sequential IO may be reduced in exchange for
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* more efficient {@code seek()} operations.
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* Value: {@value}
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*/
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@InterfaceStability.Unstable
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public static final String INPUT_FADV_RANDOM = "random";
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}
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@ -29,6 +29,7 @@
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import java.util.List;
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import java.util.Map;
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import java.util.concurrent.ExecutorService;
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import java.util.Objects;
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import java.util.concurrent.TimeUnit;
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import com.amazonaws.auth.EnvironmentVariableCredentialsProvider;
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@ -82,7 +83,6 @@
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import org.apache.hadoop.util.Progressable;
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import org.apache.hadoop.util.VersionInfo;
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import static org.apache.commons.lang.StringUtils.*;
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import static org.apache.hadoop.fs.s3a.Constants.*;
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import static org.apache.hadoop.fs.s3a.S3AUtils.*;
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import static org.apache.hadoop.fs.s3a.Statistic.*;
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@ -126,6 +126,7 @@ public class S3AFileSystem extends FileSystem {
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private S3AInstrumentation instrumentation;
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private S3AStorageStatistics storageStatistics;
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private long readAhead;
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private S3AInputPolicy inputPolicy;
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// The maximum number of entries that can be deleted in any call to s3
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private static final int MAX_ENTRIES_TO_DELETE = 1000;
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@ -227,6 +228,8 @@ public StorageStatistics provide() {
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serverSideEncryptionAlgorithm =
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conf.getTrimmed(SERVER_SIDE_ENCRYPTION_ALGORITHM);
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inputPolicy = S3AInputPolicy.getPolicy(
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conf.getTrimmed(INPUT_FADVISE, INPUT_FADV_NORMAL));
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} catch (AmazonClientException e) {
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throw translateException("initializing ", new Path(name), e);
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}
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@ -482,6 +485,26 @@ AmazonS3Client getAmazonS3Client() {
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return s3;
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}
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/**
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* Get the input policy for this FS instance.
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* @return the input policy
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*/
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@InterfaceStability.Unstable
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public S3AInputPolicy getInputPolicy() {
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return inputPolicy;
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}
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/**
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* Change the input policy for this FS.
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* @param inputPolicy new policy
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*/
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@InterfaceStability.Unstable
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public void setInputPolicy(S3AInputPolicy inputPolicy) {
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Objects.requireNonNull(inputPolicy, "Null inputStrategy");
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LOG.debug("Setting input strategy: {}", inputPolicy);
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this.inputPolicy = inputPolicy;
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}
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public S3AFileSystem() {
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super();
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}
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@ -537,7 +560,8 @@ public FSDataInputStream open(Path f, int bufferSize)
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}
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return new FSDataInputStream(new S3AInputStream(bucket, pathToKey(f),
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fileStatus.getLen(), s3, statistics, instrumentation, readAhead));
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fileStatus.getLen(), s3, statistics, instrumentation, readAhead,
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inputPolicy));
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}
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/**
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@ -1745,6 +1769,7 @@ public String toString() {
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"S3AFileSystem{");
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sb.append("uri=").append(uri);
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sb.append(", workingDir=").append(workingDir);
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sb.append(", inputPolicy=").append(inputPolicy);
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sb.append(", partSize=").append(partSize);
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sb.append(", enableMultiObjectsDelete=").append(enableMultiObjectsDelete);
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sb.append(", maxKeys=").append(maxKeys);
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@ -0,0 +1,76 @@
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/*
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* Licensed to the Apache Software Foundation (ASF) under one
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* or more contributor license agreements. See the NOTICE file
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* distributed with this work for additional information
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* regarding copyright ownership. The ASF licenses this file
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* to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.apache.hadoop.fs.s3a;
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import org.apache.hadoop.classification.InterfaceAudience;
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import org.apache.hadoop.classification.InterfaceStability;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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import java.util.Locale;
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import static org.apache.hadoop.fs.s3a.Constants.*;
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/**
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* Filesystem input policy.
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*/
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@InterfaceAudience.Private
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@InterfaceStability.Unstable
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public enum S3AInputPolicy {
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Normal(INPUT_FADV_NORMAL),
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Sequential(INPUT_FADV_SEQUENTIAL),
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Random(INPUT_FADV_RANDOM);
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private static final Logger LOG =
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LoggerFactory.getLogger(S3AInputPolicy.class);
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private final String policy;
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S3AInputPolicy(String policy) {
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this.policy = policy;
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}
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@Override
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public String toString() {
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return policy;
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}
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/**
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* Choose an FS access policy.
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* Always returns something,
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* primarily by downgrading to "normal" if there is no other match.
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* @param name strategy name from a configuration option, etc.
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* @return the chosen strategy
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*/
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public static S3AInputPolicy getPolicy(String name) {
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String trimmed = name.trim().toLowerCase(Locale.ENGLISH);
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switch (trimmed) {
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case INPUT_FADV_NORMAL:
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return Normal;
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case INPUT_FADV_RANDOM:
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return Random;
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case INPUT_FADV_SEQUENTIAL:
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return Sequential;
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default:
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LOG.warn("Unrecognized " + INPUT_FADVISE + " value: \"{}\"", trimmed);
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return Normal;
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}
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}
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}
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@ -77,9 +77,9 @@ public class S3AInputStream extends FSInputStream implements CanSetReadahead {
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private final long contentLength;
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private final String uri;
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public static final Logger LOG = S3AFileSystem.LOG;
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public static final long CLOSE_THRESHOLD = 4096;
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private final S3AInstrumentation.InputStreamStatistics streamStatistics;
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private long readahead;
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private final S3AInputPolicy inputPolicy;
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private long readahead = Constants.DEFAULT_READAHEAD_RANGE;
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/**
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* This is the actual position within the object, used by
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@ -87,8 +87,16 @@ public class S3AInputStream extends FSInputStream implements CanSetReadahead {
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*/
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private long nextReadPos;
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/* Amount of data desired from the request */
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private long requestedStreamLen;
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/**
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* The end of the content range of the last request.
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* This is an absolute value of the range, not a length field.
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*/
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private long contentRangeFinish;
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/**
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* The start of the content range of the last request.
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*/
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private long contentRangeStart;
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public S3AInputStream(String bucket,
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String key,
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@ -96,7 +104,8 @@ public S3AInputStream(String bucket,
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AmazonS3Client client,
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FileSystem.Statistics stats,
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S3AInstrumentation instrumentation,
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long readahead) {
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long readahead,
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S3AInputPolicy inputPolicy) {
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Preconditions.checkArgument(StringUtils.isNotEmpty(bucket), "No Bucket");
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Preconditions.checkArgument(StringUtils.isNotEmpty(key), "No Key");
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Preconditions.checkArgument(contentLength >= 0 , "Negative content length");
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@ -107,6 +116,7 @@ public S3AInputStream(String bucket,
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this.stats = stats;
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this.uri = "s3a://" + this.bucket + "/" + this.key;
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this.streamStatistics = instrumentation.newInputStreamStatistics();
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this.inputPolicy = inputPolicy;
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setReadahead(readahead);
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}
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@ -120,21 +130,23 @@ public S3AInputStream(String bucket,
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*/
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private synchronized void reopen(String reason, long targetPos, long length)
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throws IOException {
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requestedStreamLen = this.contentLength;
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if (wrappedStream != null) {
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closeStream("reopen(" + reason + ")", requestedStreamLen);
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closeStream("reopen(" + reason + ")", contentRangeFinish);
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}
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LOG.debug("reopen({}) for {} at targetPos={}, length={}," +
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" requestedStreamLen={}, streamPosition={}, nextReadPosition={}",
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uri, reason, targetPos, length, requestedStreamLen, pos, nextReadPos);
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contentRangeFinish = calculateRequestLimit(inputPolicy, targetPos,
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length, contentLength, readahead);
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LOG.debug("reopen({}) for {} range[{}-{}], length={}," +
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" streamPosition={}, nextReadPosition={}",
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uri, reason, targetPos, contentRangeFinish, length, pos, nextReadPos);
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streamStatistics.streamOpened();
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try {
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GetObjectRequest request = new GetObjectRequest(bucket, key)
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.withRange(targetPos, requestedStreamLen);
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.withRange(targetPos, contentRangeFinish);
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wrappedStream = client.getObject(request).getObjectContent();
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contentRangeStart = targetPos;
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if (wrappedStream == null) {
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throw new IOException("Null IO stream from reopen of (" + reason + ") "
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+ uri);
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@ -205,8 +217,13 @@ private void seekInStream(long targetPos, long length) throws IOException {
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long forwardSeekRange = Math.max(readahead, available);
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// work out how much is actually left in the stream
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// then choose whichever comes first: the range or the EOF
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long forwardSeekLimit = Math.min(remaining(), forwardSeekRange);
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if (diff <= forwardSeekLimit) {
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long remainingInCurrentRequest = remainingInCurrentRequest();
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long forwardSeekLimit = Math.min(remainingInCurrentRequest,
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forwardSeekRange);
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boolean skipForward = remainingInCurrentRequest > 0
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&& diff <= forwardSeekLimit;
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if (skipForward) {
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// the forward seek range is within the limits
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LOG.debug("Forward seek on {}, of {} bytes", uri, diff);
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streamStatistics.seekForwards(diff);
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@ -231,14 +248,16 @@ private void seekInStream(long targetPos, long length) throws IOException {
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streamStatistics.seekBackwards(diff);
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} else {
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// targetPos == pos
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// this should never happen as the caller filters it out.
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// Retained just in case
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LOG.debug("Ignoring seek {} to {} as target position == current",
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uri, targetPos);
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if (remainingInCurrentRequest() > 0) {
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// if there is data left in the stream, keep going
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return;
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}
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}
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// if the code reaches here, the stream needs to be reopened.
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// close the stream; if read the object will be opened at the new pos
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closeStream("seekInStream()", this.requestedStreamLen);
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closeStream("seekInStream()", this.contentRangeFinish);
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pos = targetPos;
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}
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@ -255,9 +274,7 @@ public boolean seekToNewSource(long targetPos) throws IOException {
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*/
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private void lazySeek(long targetPos, long len) throws IOException {
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//For lazy seek
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if (targetPos != this.pos) {
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seekInStream(targetPos, len);
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}
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//re-open at specific location if needed
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if (wrappedStream == null) {
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@ -284,7 +301,6 @@ public synchronized int read() throws IOException {
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return -1;
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}
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int byteRead;
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try {
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lazySeek(nextReadPos, 1);
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@ -328,7 +344,6 @@ private void onReadFailure(IOException ioe, int length) throws IOException {
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* This updates the statistics on read operations started and whether
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* or not the read operation "completed", that is: returned the exact
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* number of bytes requested.
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* @throws EOFException if there is no more data
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* @throws IOException if there are other problems
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*/
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@Override
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@ -357,7 +372,9 @@ public synchronized int read(byte[] buf, int off, int len)
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streamStatistics.readOperationStarted(nextReadPos, len);
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bytesRead = wrappedStream.read(buf, off, len);
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} catch (EOFException e) {
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throw e;
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onReadFailure(e, len);
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// the base implementation swallows EOFs.
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return -1;
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} catch (IOException e) {
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onReadFailure(e, len);
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bytesRead = wrappedStream.read(buf, off, len);
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@ -397,7 +414,7 @@ public synchronized void close() throws IOException {
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closed = true;
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try {
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// close or abort the stream
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closeStream("close() operation", this.contentLength);
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closeStream("close() operation", this.contentRangeFinish);
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// this is actually a no-op
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super.close();
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} finally {
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@ -420,13 +437,17 @@ public synchronized void close() throws IOException {
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*/
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private void closeStream(String reason, long length) {
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if (wrappedStream != null) {
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boolean shouldAbort = length - pos > CLOSE_THRESHOLD;
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// if the amount of data remaining in the current request is greater
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// than the readahead value: abort.
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long remaining = remainingInCurrentRequest();
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boolean shouldAbort = remaining > readahead;
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if (!shouldAbort) {
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try {
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// clean close. This will read to the end of the stream,
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// so, while cleaner, can be pathological on a multi-GB object
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wrappedStream.close();
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streamStatistics.streamClose(false);
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streamStatistics.streamClose(false, remaining);
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} catch (IOException e) {
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// exception escalates to an abort
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LOG.debug("When closing {} stream for {}", uri, reason, e);
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@ -437,11 +458,13 @@ private void closeStream(String reason, long length) {
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// Abort, rather than just close, the underlying stream. Otherwise, the
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// remaining object payload is read from S3 while closing the stream.
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wrappedStream.abort();
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streamStatistics.streamClose(true);
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streamStatistics.streamClose(true, remaining);
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}
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LOG.debug("Stream {} {}: {}; streamPos={}, nextReadPos={}," +
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" length={}",
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uri, (shouldAbort ? "aborted":"closed"), reason, pos, nextReadPos,
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" request range {}-{} length={}",
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uri, (shouldAbort ? "aborted" : "closed"), reason,
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pos, nextReadPos,
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contentRangeStart, contentRangeFinish,
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length);
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wrappedStream = null;
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}
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@ -451,7 +474,7 @@ private void closeStream(String reason, long length) {
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public synchronized int available() throws IOException {
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checkNotClosed();
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long remaining = remaining();
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long remaining = remainingInFile();
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if (remaining > Integer.MAX_VALUE) {
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return Integer.MAX_VALUE;
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}
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|
|
@ -462,10 +485,35 @@ public synchronized int available() throws IOException {
|
|||
* Bytes left in stream.
|
||||
* @return how many bytes are left to read
|
||||
*/
|
||||
protected long remaining() {
|
||||
@InterfaceAudience.Private
|
||||
@InterfaceStability.Unstable
|
||||
public synchronized long remainingInFile() {
|
||||
return this.contentLength - this.pos;
|
||||
}
|
||||
|
||||
/**
|
||||
* Bytes left in the current request.
|
||||
* Only valid if there is an active request.
|
||||
* @return how many bytes are left to read in the current GET.
|
||||
*/
|
||||
@InterfaceAudience.Private
|
||||
@InterfaceStability.Unstable
|
||||
public synchronized long remainingInCurrentRequest() {
|
||||
return this.contentRangeFinish - this.pos;
|
||||
}
|
||||
|
||||
@InterfaceAudience.Private
|
||||
@InterfaceStability.Unstable
|
||||
public synchronized long getContentRangeFinish() {
|
||||
return contentRangeFinish;
|
||||
}
|
||||
|
||||
@InterfaceAudience.Private
|
||||
@InterfaceStability.Unstable
|
||||
public synchronized long getContentRangeStart() {
|
||||
return contentRangeStart;
|
||||
}
|
||||
|
||||
@Override
|
||||
public boolean markSupported() {
|
||||
return false;
|
||||
|
|
@ -480,16 +528,26 @@ public boolean markSupported() {
|
|||
@Override
|
||||
@InterfaceStability.Unstable
|
||||
public String toString() {
|
||||
String s = streamStatistics.toString();
|
||||
synchronized (this) {
|
||||
final StringBuilder sb = new StringBuilder(
|
||||
"S3AInputStream{");
|
||||
sb.append(uri);
|
||||
sb.append(" wrappedStream=")
|
||||
.append(wrappedStream != null ? "open" : "closed");
|
||||
sb.append(" read policy=").append(inputPolicy);
|
||||
sb.append(" pos=").append(pos);
|
||||
sb.append(" nextReadPos=").append(nextReadPos);
|
||||
sb.append(" contentLength=").append(contentLength);
|
||||
sb.append(" ").append(streamStatistics.toString());
|
||||
sb.append(" contentRangeStart=").append(contentRangeStart);
|
||||
sb.append(" contentRangeFinish=").append(contentRangeFinish);
|
||||
sb.append(" remainingInCurrentRequest=")
|
||||
.append(remainingInCurrentRequest());
|
||||
sb.append('\n').append(s);
|
||||
sb.append('}');
|
||||
return sb.toString();
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Subclass {@code readFully()} operation which only seeks at the start
|
||||
|
|
@ -542,7 +600,7 @@ public S3AInstrumentation.InputStreamStatistics getS3AStreamStatistics() {
|
|||
}
|
||||
|
||||
@Override
|
||||
public void setReadahead(Long readahead) {
|
||||
public synchronized void setReadahead(Long readahead) {
|
||||
if (readahead == null) {
|
||||
this.readahead = Constants.DEFAULT_READAHEAD_RANGE;
|
||||
} else {
|
||||
|
|
@ -555,7 +613,48 @@ public void setReadahead(Long readahead) {
|
|||
* Get the current readahead value.
|
||||
* @return a non-negative readahead value
|
||||
*/
|
||||
public long getReadahead() {
|
||||
public synchronized long getReadahead() {
|
||||
return readahead;
|
||||
}
|
||||
|
||||
/**
|
||||
* Calculate the limit for a get request, based on input policy
|
||||
* and state of object.
|
||||
* @param inputPolicy input policy
|
||||
* @param targetPos position of the read
|
||||
* @param length length of bytes requested; if less than zero "unknown"
|
||||
* @param contentLength total length of file
|
||||
* @param readahead current readahead value
|
||||
* @return the absolute value of the limit of the request.
|
||||
*/
|
||||
static long calculateRequestLimit(
|
||||
S3AInputPolicy inputPolicy,
|
||||
long targetPos,
|
||||
long length,
|
||||
long contentLength,
|
||||
long readahead) {
|
||||
long rangeLimit;
|
||||
switch (inputPolicy) {
|
||||
case Random:
|
||||
// positioned.
|
||||
// read either this block, or the here + readahead value.
|
||||
rangeLimit = (length < 0) ? contentLength
|
||||
: targetPos + Math.max(readahead, length);
|
||||
break;
|
||||
|
||||
case Sequential:
|
||||
// sequential: plan for reading the entire object.
|
||||
rangeLimit = contentLength;
|
||||
break;
|
||||
|
||||
case Normal:
|
||||
default:
|
||||
rangeLimit = contentLength;
|
||||
|
||||
}
|
||||
// cannot read past the end of the object
|
||||
rangeLimit = Math.min(contentLength, rangeLimit);
|
||||
return rangeLimit;
|
||||
}
|
||||
|
||||
}
|
||||
|
|
|
|||
|
|
@ -67,6 +67,8 @@ public class S3AInstrumentation {
|
|||
private final MutableCounterLong streamReadOperations;
|
||||
private final MutableCounterLong streamReadFullyOperations;
|
||||
private final MutableCounterLong streamReadsIncomplete;
|
||||
private final MutableCounterLong streamBytesReadInClose;
|
||||
private final MutableCounterLong streamBytesDiscardedInAbort;
|
||||
private final MutableCounterLong ignoredErrors;
|
||||
|
||||
private final MutableCounterLong numberOfFilesCreated;
|
||||
|
|
@ -75,7 +77,8 @@ public class S3AInstrumentation {
|
|||
private final MutableCounterLong numberOfFilesDeleted;
|
||||
private final MutableCounterLong numberOfDirectoriesCreated;
|
||||
private final MutableCounterLong numberOfDirectoriesDeleted;
|
||||
private final Map<String, MutableCounterLong> streamMetrics = new HashMap<>();
|
||||
private final Map<String, MutableCounterLong> streamMetrics =
|
||||
new HashMap<>(30);
|
||||
|
||||
private static final Statistic[] COUNTERS_TO_CREATE = {
|
||||
INVOCATION_COPY_FROM_LOCAL_FILE,
|
||||
|
|
@ -125,6 +128,8 @@ public S3AInstrumentation(URI name) {
|
|||
streamCounter(STREAM_READ_FULLY_OPERATIONS);
|
||||
streamReadsIncomplete =
|
||||
streamCounter(STREAM_READ_OPERATIONS_INCOMPLETE);
|
||||
streamBytesReadInClose = streamCounter(STREAM_CLOSE_BYTES_READ);
|
||||
streamBytesDiscardedInAbort = streamCounter(STREAM_ABORT_BYTES_DISCARDED);
|
||||
numberOfFilesCreated = counter(FILES_CREATED);
|
||||
numberOfFilesCopied = counter(FILES_COPIED);
|
||||
bytesOfFilesCopied = counter(FILES_COPIED_BYTES);
|
||||
|
|
@ -362,6 +367,8 @@ private void mergeInputStreamStatistics(InputStreamStatistics statistics) {
|
|||
streamReadOperations.incr(statistics.readOperations);
|
||||
streamReadFullyOperations.incr(statistics.readFullyOperations);
|
||||
streamReadsIncomplete.incr(statistics.readsIncomplete);
|
||||
streamBytesReadInClose.incr(statistics.bytesReadInClose);
|
||||
streamBytesDiscardedInAbort.incr(statistics.bytesDiscardedInAbort);
|
||||
}
|
||||
|
||||
/**
|
||||
|
|
@ -386,6 +393,8 @@ public final class InputStreamStatistics implements AutoCloseable {
|
|||
public long readOperations;
|
||||
public long readFullyOperations;
|
||||
public long readsIncomplete;
|
||||
public long bytesReadInClose;
|
||||
public long bytesDiscardedInAbort;
|
||||
|
||||
private InputStreamStatistics() {
|
||||
}
|
||||
|
|
@ -426,13 +435,18 @@ public void streamOpened() {
|
|||
* The inner stream was closed.
|
||||
* @param abortedConnection flag to indicate the stream was aborted,
|
||||
* rather than closed cleanly
|
||||
* @param remainingInCurrentRequest the number of bytes remaining in
|
||||
* the current request.
|
||||
*/
|
||||
public void streamClose(boolean abortedConnection) {
|
||||
public void streamClose(boolean abortedConnection,
|
||||
long remainingInCurrentRequest) {
|
||||
closeOperations++;
|
||||
if (abortedConnection) {
|
||||
this.aborted++;
|
||||
bytesDiscardedInAbort += remainingInCurrentRequest;
|
||||
} else {
|
||||
closed++;
|
||||
bytesReadInClose += remainingInCurrentRequest;
|
||||
}
|
||||
}
|
||||
|
||||
|
|
@ -522,6 +536,8 @@ public String toString() {
|
|||
sb.append(", ReadOperations=").append(readOperations);
|
||||
sb.append(", ReadFullyOperations=").append(readFullyOperations);
|
||||
sb.append(", ReadsIncomplete=").append(readsIncomplete);
|
||||
sb.append(", BytesReadInClose=").append(bytesReadInClose);
|
||||
sb.append(", BytesDiscardedInAbort=").append(bytesDiscardedInAbort);
|
||||
sb.append('}');
|
||||
return sb.toString();
|
||||
}
|
||||
|
|
|
|||
|
|
@ -71,33 +71,37 @@ public enum Statistic {
|
|||
OBJECT_PUT_REQUESTS("object_put_requests",
|
||||
"Object put/multipart upload count"),
|
||||
OBJECT_PUT_BYTES("object_put_bytes", "number of bytes uploaded"),
|
||||
STREAM_ABORTED("streamAborted",
|
||||
STREAM_ABORTED("stream_aborted",
|
||||
"Count of times the TCP stream was aborted"),
|
||||
STREAM_BACKWARD_SEEK_OPERATIONS("streamBackwardSeekOperations",
|
||||
STREAM_BACKWARD_SEEK_OPERATIONS("stream_backward_seek_pperations",
|
||||
"Number of executed seek operations which went backwards in a stream"),
|
||||
STREAM_CLOSED("streamClosed", "Count of times the TCP stream was closed"),
|
||||
STREAM_CLOSE_OPERATIONS("streamCloseOperations",
|
||||
STREAM_CLOSE_OPERATIONS("stream_close_operations",
|
||||
"Total count of times an attempt to close a data stream was made"),
|
||||
STREAM_FORWARD_SEEK_OPERATIONS("streamForwardSeekOperations",
|
||||
STREAM_FORWARD_SEEK_OPERATIONS("stream_forward_seek_operations",
|
||||
"Number of executed seek operations which went forward in a stream"),
|
||||
STREAM_OPENED("streamOpened",
|
||||
"Total count of times an input stream to object store was opened"),
|
||||
STREAM_READ_EXCEPTIONS("streamReadExceptions",
|
||||
STREAM_READ_EXCEPTIONS("stream_read_exceptions",
|
||||
"Number of seek operations invoked on input streams"),
|
||||
STREAM_READ_FULLY_OPERATIONS("streamReadFullyOperations",
|
||||
"count of readFully() operations in streams"),
|
||||
STREAM_READ_OPERATIONS("streamReadOperations",
|
||||
STREAM_READ_FULLY_OPERATIONS("stream_read_fully_operations",
|
||||
"Count of readFully() operations in streams"),
|
||||
STREAM_READ_OPERATIONS("stream_read_operations",
|
||||
"Count of read() operations in streams"),
|
||||
STREAM_READ_OPERATIONS_INCOMPLETE("streamReadOperationsIncomplete",
|
||||
STREAM_READ_OPERATIONS_INCOMPLETE("stream_read_operations_incomplete",
|
||||
"Count of incomplete read() operations in streams"),
|
||||
STREAM_SEEK_BYTES_BACKWARDS("streamBytesBackwardsOnSeek",
|
||||
STREAM_SEEK_BYTES_BACKWARDS("stream_bytes_backwards_on_seek",
|
||||
"Count of bytes moved backwards during seek operations"),
|
||||
STREAM_SEEK_BYTES_READ("streamBytesRead",
|
||||
STREAM_SEEK_BYTES_READ("stream_bytes_read",
|
||||
"Count of bytes read during seek() in stream operations"),
|
||||
STREAM_SEEK_BYTES_SKIPPED("streamBytesSkippedOnSeek",
|
||||
STREAM_SEEK_BYTES_SKIPPED("stream_bytes_skipped_on_seek",
|
||||
"Count of bytes skipped during forward seek operation"),
|
||||
STREAM_SEEK_OPERATIONS("streamSeekOperations",
|
||||
"Number of read exceptions caught and attempted to recovered from");
|
||||
STREAM_SEEK_OPERATIONS("stream_seek_operations",
|
||||
"Number of seek operations during stream IO."),
|
||||
STREAM_CLOSE_BYTES_READ("stream_bytes_read_in_close",
|
||||
"Count of bytes read when closing streams during seek operations."),
|
||||
STREAM_ABORT_BYTES_DISCARDED("stream_bytes_discarded_in_abort",
|
||||
"Count of bytes discarded by aborting the stream");
|
||||
|
||||
Statistic(String symbol, String description) {
|
||||
this.symbol = symbol;
|
||||
|
|
|
|||
|
|
@ -657,6 +657,78 @@ the available memory. These settings should be tuned to the envisioned
|
|||
workflow (some large files, many small ones, ...) and the physical
|
||||
limitations of the machine and cluster (memory, network bandwidth).
|
||||
|
||||
### S3A Experimental "fadvise" input policy support
|
||||
|
||||
**Warning: EXPERIMENTAL: behavior may change in future**
|
||||
|
||||
The S3A Filesystem client supports the notion of input policies, similar
|
||||
to that of the Posix `fadvise()` API call. This tunes the behavior of the S3A
|
||||
client to optimise HTTP GET requests for the different use cases.
|
||||
|
||||
#### "sequential" (default)
|
||||
|
||||
Read through the file, possibly with some short forward seeks.
|
||||
|
||||
The whole document is requested in a single HTTP request; forward seeks
|
||||
within the readahead range are supported by skipping over the intermediate
|
||||
data.
|
||||
|
||||
This is leads to maximum read throughput —but with very expensive
|
||||
backward seeks.
|
||||
|
||||
|
||||
#### "normal"
|
||||
|
||||
This is currently the same as "sequential".
|
||||
|
||||
#### "random"
|
||||
|
||||
Optimised for random IO, specifically the Hadoop `PositionedReadable`
|
||||
operations —though `seek(offset); read(byte_buffer)` also benefits.
|
||||
|
||||
Rather than ask for the whole file, the range of the HTTP request is
|
||||
set to that that of the length of data desired in the `read` operation
|
||||
(Rounded up to the readahead value set in `setReadahead()` if necessary).
|
||||
|
||||
By reducing the cost of closing existing HTTP requests, this is
|
||||
highly efficient for file IO accessing a binary file
|
||||
through a series of `PositionedReadable.read()` and `PositionedReadable.readFully()`
|
||||
calls. Sequential reading of a file is expensive, as now many HTTP requests must
|
||||
be made to read through the file.
|
||||
|
||||
For operations simply reading through a file: copying, distCp, reading
|
||||
Gzipped or other compressed formats, parsing .csv files, etc, the `sequential`
|
||||
policy is appropriate. This is the default: S3A does not need to be configured.
|
||||
|
||||
For the specific case of high-performance random access IO, the `random` policy
|
||||
may be considered. The requirements are:
|
||||
|
||||
* Data is read using the `PositionedReadable` API.
|
||||
* Long distance (many MB) forward seeks
|
||||
* Backward seeks as likely as forward seeks.
|
||||
* Little or no use of single character `read()` calls or small `read(buffer)`
|
||||
calls.
|
||||
* Applications running close to the S3 data store. That is: in EC2 VMs in
|
||||
the same datacenter as the S3 instance.
|
||||
|
||||
The desired fadvise policy must be set in the configuration option
|
||||
`fs.s3a.experimental.input.fadvise` when the filesystem instance is created.
|
||||
That is: it can only be set on a per-filesystem basis, not on a per-file-read
|
||||
basis.
|
||||
|
||||
<property>
|
||||
<name>fs.s3a.experimental.input.fadvise</name>
|
||||
<value>random</value>
|
||||
<description>Policy for reading files.
|
||||
Values: 'random', 'sequential' or 'normal'
|
||||
</description>
|
||||
</property>
|
||||
|
||||
[HDFS-2744](https://issues.apache.org/jira/browse/HDFS-2744),
|
||||
*Extend FSDataInputStream to allow fadvise* proposes adding a public API
|
||||
to set fadvise policies on input streams. Once implemented,
|
||||
this will become the supported mechanism used for configuring the input IO policy.
|
||||
|
||||
## Troubleshooting S3A
|
||||
|
||||
Common problems working with S3A are
|
||||
|
|
@ -832,6 +904,10 @@ a failure should not lose data —it may result in duplicate datasets.
|
|||
* Because the write only begins on a `close()` operation, it may be in the final
|
||||
phase of a process where the write starts —this can take so long that some things
|
||||
can actually time out.
|
||||
* File IO performing many seek calls/positioned read calls will encounter
|
||||
performance problems due to the size of the HTTP requests made. On S3a,
|
||||
the (experimental) fadvise policy "random" can be set to alleviate this at the
|
||||
expense of sequential read performance and bandwidth.
|
||||
|
||||
The slow performance of `rename()` surfaces during the commit phase of work,
|
||||
including
|
||||
|
|
|
|||
|
|
@ -0,0 +1,91 @@
|
|||
/*
|
||||
* Licensed to the Apache Software Foundation (ASF) under one
|
||||
* or more contributor license agreements. See the NOTICE file
|
||||
* distributed with this work for additional information
|
||||
* regarding copyright ownership. The ASF licenses this file
|
||||
* to you under the Apache License, Version 2.0 (the
|
||||
* "License"); you may not use this file except in compliance
|
||||
* with the License. You may obtain a copy of the License at
|
||||
*
|
||||
* http://www.apache.org/licenses/LICENSE-2.0
|
||||
*
|
||||
* Unless required by applicable law or agreed to in writing, software
|
||||
* distributed under the License is distributed on an "AS IS" BASIS,
|
||||
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
||||
* See the License for the specific language governing permissions and
|
||||
* limitations under the License.
|
||||
*/
|
||||
|
||||
package org.apache.hadoop.fs.s3a;
|
||||
|
||||
import org.junit.Assert;
|
||||
import org.junit.Test;
|
||||
import org.junit.runner.RunWith;
|
||||
import org.junit.runners.Parameterized;
|
||||
|
||||
import java.util.Arrays;
|
||||
import java.util.Collection;
|
||||
|
||||
/**
|
||||
* Unit test of the input policy logic, without making any S3 calls.
|
||||
*/
|
||||
@RunWith(Parameterized.class)
|
||||
public class TestS3AInputPolicies {
|
||||
|
||||
private S3AInputPolicy policy;
|
||||
private long targetPos;
|
||||
private long length;
|
||||
private long contentLength;
|
||||
private long readahead;
|
||||
private long expectedLimit;
|
||||
|
||||
public static final long _64K = 64 * 1024;
|
||||
public static final long _128K = 128 * 1024;
|
||||
public static final long _256K = 256 * 1024;
|
||||
public static final long _1MB = 1024L * 1024;
|
||||
public static final long _10MB = _1MB * 10;
|
||||
|
||||
public TestS3AInputPolicies(S3AInputPolicy policy,
|
||||
long targetPos,
|
||||
long length,
|
||||
long contentLength,
|
||||
long readahead,
|
||||
long expectedLimit) {
|
||||
this.policy = policy;
|
||||
this.targetPos = targetPos;
|
||||
this.length = length;
|
||||
this.contentLength = contentLength;
|
||||
this.readahead = readahead;
|
||||
this.expectedLimit = expectedLimit;
|
||||
}
|
||||
|
||||
@Parameterized.Parameters
|
||||
public static Collection<Object[]> data() {
|
||||
return Arrays.asList(new Object[][]{
|
||||
{S3AInputPolicy.Normal, 0, -1, 0, _64K, 0},
|
||||
{S3AInputPolicy.Normal, 0, -1, _10MB, _64K, _10MB},
|
||||
{S3AInputPolicy.Normal, _64K, _64K, _10MB, _64K, _10MB},
|
||||
{S3AInputPolicy.Sequential, 0, -1, 0, _64K, 0},
|
||||
{S3AInputPolicy.Sequential, 0, -1, _10MB, _64K, _10MB},
|
||||
{S3AInputPolicy.Random, 0, -1, 0, _64K, 0},
|
||||
{S3AInputPolicy.Random, 0, -1, _10MB, _64K, _10MB},
|
||||
{S3AInputPolicy.Random, 0, _128K, _10MB, _64K, _128K},
|
||||
{S3AInputPolicy.Random, 0, _128K, _10MB, _256K, _256K},
|
||||
{S3AInputPolicy.Random, 0, 0, _10MB, _256K, _256K},
|
||||
{S3AInputPolicy.Random, 0, 1, _10MB, _256K, _256K},
|
||||
{S3AInputPolicy.Random, 0, _1MB, _10MB, _256K, _1MB},
|
||||
{S3AInputPolicy.Random, 0, _1MB, _10MB, 0, _1MB},
|
||||
{S3AInputPolicy.Random, _10MB + _64K, _1MB, _10MB, _256K, _10MB},
|
||||
});
|
||||
}
|
||||
|
||||
@Test
|
||||
public void testInputPolicies() throws Throwable {
|
||||
Assert.assertEquals(
|
||||
String.format("calculateRequestLimit(%s, %d, %d, %d, %d)",
|
||||
policy, targetPos, length, contentLength, readahead),
|
||||
expectedLimit,
|
||||
S3AInputStream.calculateRequestLimit(policy, targetPos,
|
||||
length, contentLength, readahead));
|
||||
}
|
||||
}
|
||||
|
|
@ -22,11 +22,17 @@
|
|||
import org.apache.hadoop.fs.FSDataInputStream;
|
||||
import org.apache.hadoop.fs.FileSystem;
|
||||
import org.apache.hadoop.fs.Path;
|
||||
import org.apache.hadoop.fs.s3a.Constants;
|
||||
import org.apache.hadoop.fs.contract.ContractTestUtils;
|
||||
import org.apache.hadoop.fs.s3a.S3AFileStatus;
|
||||
import org.apache.hadoop.fs.s3a.S3AFileSystem;
|
||||
import org.apache.hadoop.fs.s3a.S3AInputPolicy;
|
||||
import org.apache.hadoop.fs.s3a.S3AInputStream;
|
||||
import org.apache.hadoop.fs.s3a.S3AInstrumentation;
|
||||
import org.apache.hadoop.io.IOUtils;
|
||||
import org.apache.hadoop.io.Text;
|
||||
import org.apache.hadoop.io.compress.CompressionCodec;
|
||||
import org.apache.hadoop.io.compress.CompressionCodecFactory;
|
||||
import org.apache.hadoop.util.LineReader;
|
||||
import org.junit.After;
|
||||
import org.junit.Assume;
|
||||
import org.junit.Before;
|
||||
|
|
@ -34,6 +40,7 @@
|
|||
import org.slf4j.Logger;
|
||||
import org.slf4j.LoggerFactory;
|
||||
|
||||
import java.io.EOFException;
|
||||
import java.io.IOException;
|
||||
|
||||
import static org.apache.hadoop.fs.contract.ContractTestUtils.*;
|
||||
|
|
@ -53,13 +60,13 @@ public class TestS3AInputStreamPerformance extends S3AScaleTestBase {
|
|||
public static final int BLOCK_SIZE = 32 * 1024;
|
||||
public static final int BIG_BLOCK_SIZE = 256 * 1024;
|
||||
|
||||
/** Tests only run if the there is a named test file that can be read */
|
||||
/** Tests only run if the there is a named test file that can be read. */
|
||||
private boolean testDataAvailable = true;
|
||||
private String assumptionMessage = "test file";
|
||||
|
||||
/**
|
||||
* Open the FS and the test data. The input stream is always set up here.
|
||||
* @throws IOException
|
||||
* @throws IOException IO Problems.
|
||||
*/
|
||||
@Before
|
||||
public void openFS() throws IOException {
|
||||
|
|
@ -70,9 +77,10 @@ public void openFS() throws IOException {
|
|||
testDataAvailable = false;
|
||||
} else {
|
||||
testData = new Path(testFile);
|
||||
s3aFS = (S3AFileSystem) FileSystem.newInstance(testData.toUri(), conf);
|
||||
Path path = this.testData;
|
||||
bindS3aFS(path);
|
||||
try {
|
||||
testDataStatus = s3aFS.getFileStatus(testData);
|
||||
testDataStatus = s3aFS.getFileStatus(this.testData);
|
||||
} catch (IOException e) {
|
||||
LOG.warn("Failed to read file {} specified in {}",
|
||||
testFile, KEY_CSVTEST_FILE, e);
|
||||
|
|
@ -81,98 +89,131 @@ public void openFS() throws IOException {
|
|||
}
|
||||
}
|
||||
|
||||
private void bindS3aFS(Path path) throws IOException {
|
||||
s3aFS = (S3AFileSystem) FileSystem.newInstance(path.toUri(), getConf());
|
||||
}
|
||||
|
||||
/**
|
||||
* Cleanup: close the stream, close the FS.
|
||||
*/
|
||||
@After
|
||||
public void cleanup() {
|
||||
describe("cleanup");
|
||||
IOUtils.closeStream(in);
|
||||
IOUtils.closeStream(s3aFS);
|
||||
}
|
||||
|
||||
/**
|
||||
* Declare that the test requires the CSV test dataset
|
||||
* Declare that the test requires the CSV test dataset.
|
||||
*/
|
||||
private void requireCSVTestData() {
|
||||
Assume.assumeTrue(assumptionMessage, testDataAvailable);
|
||||
}
|
||||
|
||||
/**
|
||||
* Open the test file with the read buffer specified in the setting
|
||||
* {@link #KEY_READ_BUFFER_SIZE}
|
||||
* Open the test file with the read buffer specified in the setting.
|
||||
* {@link #KEY_READ_BUFFER_SIZE}; use the {@code Normal} policy
|
||||
* @return the stream, wrapping an S3a one
|
||||
* @throws IOException
|
||||
* @throws IOException IO problems
|
||||
*/
|
||||
FSDataInputStream openTestFile() throws IOException {
|
||||
int bufferSize = getConf().getInt(KEY_READ_BUFFER_SIZE,
|
||||
DEFAULT_READ_BUFFER_SIZE);
|
||||
FSDataInputStream stream = s3aFS.open(testData, bufferSize);
|
||||
streamStatistics = getInputStreamStatistics(stream);
|
||||
return stream;
|
||||
return openTestFile(S3AInputPolicy.Normal, 0);
|
||||
}
|
||||
|
||||
/**
|
||||
* assert tha the stream was only ever opened once
|
||||
* Open the test file with the read buffer specified in the setting
|
||||
* {@link #KEY_READ_BUFFER_SIZE}.
|
||||
* This includes the {@link #requireCSVTestData()} assumption; so
|
||||
* if called before any FS op, will automatically skip the test
|
||||
* if the CSV file is absent.
|
||||
*
|
||||
* @param inputPolicy input policy to use
|
||||
* @param readahead readahead/buffer size
|
||||
* @return the stream, wrapping an S3a one
|
||||
* @throws IOException IO problems
|
||||
*/
|
||||
FSDataInputStream openTestFile(S3AInputPolicy inputPolicy, long readahead)
|
||||
throws IOException {
|
||||
requireCSVTestData();
|
||||
return openDataFile(s3aFS, this.testData, inputPolicy, readahead);
|
||||
}
|
||||
|
||||
/**
|
||||
* Open a test file with the read buffer specified in the setting
|
||||
* {@link #KEY_READ_BUFFER_SIZE}.
|
||||
*
|
||||
* @param path path to open
|
||||
* @param inputPolicy input policy to use
|
||||
* @param readahead readahead/buffer size
|
||||
* @return the stream, wrapping an S3a one
|
||||
* @throws IOException IO problems
|
||||
*/
|
||||
private FSDataInputStream openDataFile(S3AFileSystem fs,
|
||||
Path path,
|
||||
S3AInputPolicy inputPolicy,
|
||||
long readahead) throws IOException {
|
||||
int bufferSize = getConf().getInt(KEY_READ_BUFFER_SIZE,
|
||||
DEFAULT_READ_BUFFER_SIZE);
|
||||
S3AInputPolicy policy = fs.getInputPolicy();
|
||||
fs.setInputPolicy(inputPolicy);
|
||||
try {
|
||||
FSDataInputStream stream = fs.open(path, bufferSize);
|
||||
if (readahead >= 0) {
|
||||
stream.setReadahead(readahead);
|
||||
}
|
||||
streamStatistics = getInputStreamStatistics(stream);
|
||||
return stream;
|
||||
} finally {
|
||||
fs.setInputPolicy(policy);
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Assert that the stream was only ever opened once.
|
||||
*/
|
||||
protected void assertStreamOpenedExactlyOnce() {
|
||||
assertOpenOperationCount(1);
|
||||
}
|
||||
|
||||
/**
|
||||
* Make an assertion count about the number of open operations
|
||||
* Make an assertion count about the number of open operations.
|
||||
* @param expected the expected number
|
||||
*/
|
||||
private void assertOpenOperationCount(int expected) {
|
||||
assertEquals("open operations in " + streamStatistics,
|
||||
private void assertOpenOperationCount(long expected) {
|
||||
assertEquals("open operations in\n" + in,
|
||||
expected, streamStatistics.openOperations);
|
||||
}
|
||||
|
||||
/**
|
||||
* Log how long an IOP took, by dividing the total time by the
|
||||
* count of operations, printing in a human-readable form
|
||||
* count of operations, printing in a human-readable form.
|
||||
* @param operation operation being measured
|
||||
* @param timer timing data
|
||||
* @param count IOP count.
|
||||
*/
|
||||
protected void logTimePerIOP(NanoTimer timer, long count) {
|
||||
LOG.info("Time per IOP: {} nS", toHuman(timer.duration() / count));
|
||||
}
|
||||
|
||||
@Test
|
||||
public void testTimeToOpenAndReadWholeFileByByte() throws Throwable {
|
||||
requireCSVTestData();
|
||||
describe("Open the test file %s and read it byte by byte", testData);
|
||||
long len = testDataStatus.getLen();
|
||||
NanoTimer timeOpen = new NanoTimer();
|
||||
in = openTestFile();
|
||||
timeOpen.end("Open stream");
|
||||
NanoTimer readTimer = new NanoTimer();
|
||||
long count = 0;
|
||||
while (in.read() >= 0) {
|
||||
count ++;
|
||||
}
|
||||
readTimer.end("Time to read %d bytes", len);
|
||||
bandwidth(readTimer, count);
|
||||
assertEquals("Not enough bytes were read)", len, count);
|
||||
long nanosPerByte = readTimer.nanosPerOperation(count);
|
||||
LOG.info("An open() call has the equivalent duration of reading {} bytes",
|
||||
toHuman( timeOpen.duration() / nanosPerByte));
|
||||
protected void logTimePerIOP(String operation,
|
||||
NanoTimer timer,
|
||||
long count) {
|
||||
LOG.info("Time per {}: {} nS",
|
||||
operation, toHuman(timer.duration() / count));
|
||||
}
|
||||
|
||||
@Test
|
||||
public void testTimeToOpenAndReadWholeFileBlocks() throws Throwable {
|
||||
requireCSVTestData();
|
||||
int blockSize = _1MB;
|
||||
describe("Open the test file %s and read it in blocks of size %d",
|
||||
testData, BLOCK_SIZE);
|
||||
testData, blockSize);
|
||||
long len = testDataStatus.getLen();
|
||||
in = openTestFile();
|
||||
byte[] block = new byte[BLOCK_SIZE];
|
||||
byte[] block = new byte[blockSize];
|
||||
NanoTimer timer2 = new NanoTimer();
|
||||
long count = 0;
|
||||
// implicitly rounding down here
|
||||
long blockCount = len / BLOCK_SIZE;
|
||||
long blockCount = len / blockSize;
|
||||
for (long i = 0; i < blockCount; i++) {
|
||||
int offset = 0;
|
||||
int remaining = BLOCK_SIZE;
|
||||
int remaining = blockSize;
|
||||
NanoTimer blockTimer = new NanoTimer();
|
||||
int reads = 0;
|
||||
while (remaining > 0) {
|
||||
|
|
@ -189,15 +230,14 @@ public void testTimeToOpenAndReadWholeFileBlocks() throws Throwable {
|
|||
}
|
||||
timer2.end("Time to read %d bytes in %d blocks", len, blockCount );
|
||||
bandwidth(timer2, count);
|
||||
LOG.info("{}", streamStatistics);
|
||||
logStreamStatistics();
|
||||
}
|
||||
|
||||
@Test
|
||||
public void testLazySeekEnabled() throws Throwable {
|
||||
requireCSVTestData();
|
||||
describe("Verify that seeks do not trigger any IO");
|
||||
long len = testDataStatus.getLen();
|
||||
in = openTestFile();
|
||||
long len = testDataStatus.getLen();
|
||||
NanoTimer timer = new NanoTimer();
|
||||
long blockCount = len / BLOCK_SIZE;
|
||||
for (long i = 0; i < blockCount; i++) {
|
||||
|
|
@ -206,24 +246,14 @@ public void testLazySeekEnabled() throws Throwable {
|
|||
in.seek(0);
|
||||
blockCount++;
|
||||
timer.end("Time to execute %d seeks", blockCount);
|
||||
logTimePerIOP(timer, blockCount);
|
||||
LOG.info("{}", streamStatistics);
|
||||
logTimePerIOP("seek()", timer, blockCount);
|
||||
logStreamStatistics();
|
||||
assertOpenOperationCount(0);
|
||||
assertEquals("bytes read", 0, streamStatistics.bytesRead);
|
||||
}
|
||||
|
||||
@Test
|
||||
public void testReadAheadDefault() throws Throwable {
|
||||
requireCSVTestData();
|
||||
describe("Verify that a series of forward skips within the readahead" +
|
||||
" range do not close and reopen the stream");
|
||||
executeSeekReadSequence(BLOCK_SIZE, Constants.DEFAULT_READAHEAD_RANGE);
|
||||
assertStreamOpenedExactlyOnce();
|
||||
}
|
||||
|
||||
@Test
|
||||
public void testReadaheadOutOfRange() throws Throwable {
|
||||
requireCSVTestData();
|
||||
try {
|
||||
in = openTestFile();
|
||||
in.setReadahead(-1L);
|
||||
|
|
@ -231,39 +261,75 @@ public void testReadaheadOutOfRange() throws Throwable {
|
|||
} catch (IllegalArgumentException e) {
|
||||
// expected
|
||||
}
|
||||
|
||||
}
|
||||
|
||||
@Test
|
||||
public void testReadBigBlocksAvailableReadahead() throws Throwable {
|
||||
requireCSVTestData();
|
||||
describe("set readahead to available bytes only");
|
||||
executeSeekReadSequence(BIG_BLOCK_SIZE, 0);
|
||||
// expect that the stream will have had lots of opens
|
||||
assertTrue("not enough open operations in " + streamStatistics,
|
||||
streamStatistics.openOperations > 1);
|
||||
}
|
||||
|
||||
@Test
|
||||
public void testReadBigBlocksBigReadahead() throws Throwable {
|
||||
requireCSVTestData();
|
||||
public void testReadWithNormalPolicy() throws Throwable {
|
||||
describe("Read big blocks with a big readahead");
|
||||
executeSeekReadSequence(BIG_BLOCK_SIZE, BIG_BLOCK_SIZE * 2);
|
||||
executeSeekReadSequence(BIG_BLOCK_SIZE, BIG_BLOCK_SIZE * 2,
|
||||
S3AInputPolicy.Normal);
|
||||
assertStreamOpenedExactlyOnce();
|
||||
}
|
||||
|
||||
@Test
|
||||
public void testDecompressionSequential128K() throws Throwable {
|
||||
describe("Decompress with a 128K readahead");
|
||||
executeDecompression(128 * 1024, S3AInputPolicy.Sequential);
|
||||
assertStreamOpenedExactlyOnce();
|
||||
}
|
||||
|
||||
/**
|
||||
* Execute a seek+read sequence
|
||||
* Execute a decompression + line read with the given input policy.
|
||||
* @param readahead byte readahead
|
||||
* @param inputPolicy read policy
|
||||
* @throws IOException IO Problems
|
||||
*/
|
||||
private void executeDecompression(long readahead,
|
||||
S3AInputPolicy inputPolicy) throws IOException {
|
||||
CompressionCodecFactory factory
|
||||
= new CompressionCodecFactory(getConf());
|
||||
CompressionCodec codec = factory.getCodec(testData);
|
||||
long bytesRead = 0;
|
||||
int lines = 0;
|
||||
|
||||
FSDataInputStream objectIn = openTestFile(inputPolicy, readahead);
|
||||
ContractTestUtils.NanoTimer timer = new ContractTestUtils.NanoTimer();
|
||||
try (LineReader lineReader = new LineReader(
|
||||
codec.createInputStream(objectIn), getConf())) {
|
||||
Text line = new Text();
|
||||
int read;
|
||||
while ((read = lineReader.readLine(line)) > 0) {
|
||||
bytesRead += read;
|
||||
lines++;
|
||||
}
|
||||
} catch (EOFException eof) {
|
||||
// done
|
||||
}
|
||||
timer.end("Time to read %d lines [%d bytes expanded, %d raw]" +
|
||||
" with readahead = %d",
|
||||
lines,
|
||||
bytesRead,
|
||||
testDataStatus.getLen(),
|
||||
readahead);
|
||||
logTimePerIOP("line read", timer, lines);
|
||||
logStreamStatistics();
|
||||
}
|
||||
|
||||
private void logStreamStatistics() {
|
||||
LOG.info(String.format("Stream Statistics%n{}"), streamStatistics);
|
||||
}
|
||||
|
||||
/**
|
||||
* Execute a seek+read sequence.
|
||||
* @param blockSize block size for seeks
|
||||
* @param readahead what the readahead value of the stream should be
|
||||
* @throws IOException IO problems
|
||||
*/
|
||||
protected void executeSeekReadSequence(long blockSize,
|
||||
long readahead) throws IOException {
|
||||
requireCSVTestData();
|
||||
long readahead,
|
||||
S3AInputPolicy policy) throws IOException {
|
||||
in = openTestFile(policy, readahead);
|
||||
long len = testDataStatus.getLen();
|
||||
in = openTestFile();
|
||||
in.setReadahead(readahead);
|
||||
NanoTimer timer = new NanoTimer();
|
||||
long blockCount = len / blockSize;
|
||||
LOG.info("Reading {} blocks, readahead = {}",
|
||||
|
|
@ -277,11 +343,187 @@ protected void executeSeekReadSequence(long blockSize,
|
|||
blockCount,
|
||||
blockSize,
|
||||
readahead);
|
||||
logTimePerIOP(timer, blockCount);
|
||||
logTimePerIOP("seek(pos + " + blockCount+"); read()", timer, blockCount);
|
||||
LOG.info("Effective bandwidth {} MB/S",
|
||||
timer.bandwidthDescription(streamStatistics.bytesRead -
|
||||
streamStatistics.bytesSkippedOnSeek));
|
||||
LOG.info("{}", streamStatistics);
|
||||
logStreamStatistics();
|
||||
}
|
||||
|
||||
public static final int _4K = 4 * 1024;
|
||||
public static final int _8K = 8 * 1024;
|
||||
public static final int _16K = 16 * 1024;
|
||||
public static final int _32K = 32 * 1024;
|
||||
public static final int _64K = 64 * 1024;
|
||||
public static final int _128K = 128 * 1024;
|
||||
public static final int _256K = 256 * 1024;
|
||||
public static final int _1MB = 1024 * 1024;
|
||||
public static final int _2MB = 2 * _1MB;
|
||||
public static final int _10MB = _1MB * 10;
|
||||
public static final int _5MB = _1MB * 5;
|
||||
|
||||
private static final int[][] RANDOM_IO_SEQUENCE = {
|
||||
{_2MB, _128K},
|
||||
{_128K, _128K},
|
||||
{_5MB, _64K},
|
||||
{_1MB, _1MB},
|
||||
};
|
||||
|
||||
@Test
|
||||
public void testRandomIORandomPolicy() throws Throwable {
|
||||
executeRandomIO(S3AInputPolicy.Random, (long) RANDOM_IO_SEQUENCE.length);
|
||||
assertEquals("streams aborted in " + streamStatistics,
|
||||
0, streamStatistics.aborted);
|
||||
}
|
||||
|
||||
@Test
|
||||
public void testRandomIONormalPolicy() throws Throwable {
|
||||
long expectedOpenCount = RANDOM_IO_SEQUENCE.length;
|
||||
executeRandomIO(S3AInputPolicy.Normal, expectedOpenCount);
|
||||
assertEquals("streams aborted in " + streamStatistics,
|
||||
4, streamStatistics.aborted);
|
||||
}
|
||||
|
||||
/**
|
||||
* Execute the random IO {@code readFully(pos, bytes[])} sequence defined by
|
||||
* {@link #RANDOM_IO_SEQUENCE}. The stream is closed afterwards; that's used
|
||||
* in the timing too
|
||||
* @param policy read policy
|
||||
* @param expectedOpenCount expected number of stream openings
|
||||
* @throws IOException IO problems
|
||||
* @return the timer
|
||||
*/
|
||||
private ContractTestUtils.NanoTimer executeRandomIO(S3AInputPolicy policy,
|
||||
long expectedOpenCount)
|
||||
throws IOException {
|
||||
describe("Random IO with policy \"%s\"", policy);
|
||||
byte[] buffer = new byte[_1MB];
|
||||
long totalBytesRead = 0;
|
||||
|
||||
in = openTestFile(policy, 0);
|
||||
ContractTestUtils.NanoTimer timer = new ContractTestUtils.NanoTimer();
|
||||
for (int[] action : RANDOM_IO_SEQUENCE) {
|
||||
int position = action[0];
|
||||
int range = action[1];
|
||||
in.readFully(position, buffer, 0, range);
|
||||
totalBytesRead += range;
|
||||
}
|
||||
int reads = RANDOM_IO_SEQUENCE.length;
|
||||
timer.end("Time to execute %d reads of total size %d bytes",
|
||||
reads,
|
||||
totalBytesRead);
|
||||
in.close();
|
||||
assertOpenOperationCount(expectedOpenCount);
|
||||
logTimePerIOP("byte read", timer, totalBytesRead);
|
||||
LOG.info("Effective bandwidth {} MB/S",
|
||||
timer.bandwidthDescription(streamStatistics.bytesRead -
|
||||
streamStatistics.bytesSkippedOnSeek));
|
||||
logStreamStatistics();
|
||||
return timer;
|
||||
}
|
||||
|
||||
S3AInputStream getS3aStream() {
|
||||
return (S3AInputStream) in.getWrappedStream();
|
||||
}
|
||||
|
||||
@Test
|
||||
public void testRandomReadOverBuffer() throws Throwable {
|
||||
describe("read over a buffer, making sure that the requests" +
|
||||
" spans readahead ranges");
|
||||
int datasetLen = _32K;
|
||||
Path dataFile = new Path(getTestPath(), "testReadOverBuffer.bin");
|
||||
byte[] sourceData = dataset(datasetLen, 0, 64);
|
||||
// relies on the field 'fs' referring to the R/W FS
|
||||
writeDataset(fs, dataFile, sourceData, datasetLen, _16K, true);
|
||||
byte[] buffer = new byte[datasetLen];
|
||||
int readahead = _8K;
|
||||
int halfReadahead = _4K;
|
||||
in = openDataFile(fs, dataFile, S3AInputPolicy.Random, readahead);
|
||||
|
||||
LOG.info("Starting initial reads");
|
||||
S3AInputStream s3aStream = getS3aStream();
|
||||
assertEquals(readahead, s3aStream.getReadahead());
|
||||
byte[] oneByte = new byte[1];
|
||||
assertEquals(1, in.read(0, oneByte, 0, 1));
|
||||
// make some assertions about the current state
|
||||
assertEquals("remaining in\n" + in,
|
||||
readahead - 1, s3aStream.remainingInCurrentRequest());
|
||||
assertEquals("range start in\n" + in,
|
||||
0, s3aStream.getContentRangeStart());
|
||||
assertEquals("range finish in\n" + in,
|
||||
readahead, s3aStream.getContentRangeFinish());
|
||||
|
||||
assertStreamOpenedExactlyOnce();
|
||||
|
||||
describe("Starting sequence of positioned read calls over\n%s", in);
|
||||
NanoTimer readTimer = new NanoTimer();
|
||||
int currentPos = halfReadahead;
|
||||
int offset = currentPos;
|
||||
int bytesRead = 0;
|
||||
int readOps = 0;
|
||||
|
||||
// make multiple read() calls
|
||||
while (bytesRead < halfReadahead) {
|
||||
int length = buffer.length - offset;
|
||||
int read = in.read(currentPos, buffer, offset, length);
|
||||
bytesRead += read;
|
||||
offset += read;
|
||||
readOps++;
|
||||
assertEquals("open operations on request #" + readOps
|
||||
+ " after reading " + bytesRead
|
||||
+ " current position in stream " + currentPos
|
||||
+ " in\n" + fs
|
||||
+ "\n " + in,
|
||||
1, streamStatistics.openOperations);
|
||||
for (int i = currentPos; i < currentPos + read; i++) {
|
||||
assertEquals("Wrong value from byte " + i,
|
||||
sourceData[i], buffer[i]);
|
||||
}
|
||||
currentPos += read;
|
||||
}
|
||||
assertStreamOpenedExactlyOnce();
|
||||
// assert at the end of the original block
|
||||
assertEquals(readahead, currentPos);
|
||||
readTimer.end("read %d in %d operations", bytesRead, readOps);
|
||||
bandwidth(readTimer, bytesRead);
|
||||
LOG.info("Time per byte(): {} nS",
|
||||
toHuman(readTimer.nanosPerOperation(bytesRead)));
|
||||
LOG.info("Time per read(): {} nS",
|
||||
toHuman(readTimer.nanosPerOperation(readOps)));
|
||||
|
||||
describe("read last byte");
|
||||
// read one more
|
||||
int read = in.read(currentPos, buffer, bytesRead, 1);
|
||||
assertTrue("-1 from last read", read >= 0);
|
||||
assertOpenOperationCount(2);
|
||||
assertEquals("Wrong value from read ", sourceData[currentPos],
|
||||
(int) buffer[currentPos]);
|
||||
currentPos++;
|
||||
|
||||
|
||||
// now scan all the way to the end of the file, using single byte read()
|
||||
// calls
|
||||
describe("read() to EOF over \n%s", in);
|
||||
long readCount = 0;
|
||||
NanoTimer timer = new NanoTimer();
|
||||
LOG.info("seeking");
|
||||
in.seek(currentPos);
|
||||
LOG.info("reading");
|
||||
while(currentPos < datasetLen) {
|
||||
int r = in.read();
|
||||
assertTrue("Negative read() at position " + currentPos + " in\n" + in,
|
||||
r >= 0);
|
||||
buffer[currentPos] = (byte)r;
|
||||
assertEquals("Wrong value from read from\n" + in,
|
||||
sourceData[currentPos], r);
|
||||
currentPos++;
|
||||
readCount++;
|
||||
}
|
||||
timer.end("read %d bytes", readCount);
|
||||
bandwidth(timer, readCount);
|
||||
LOG.info("Time per read(): {} nS",
|
||||
toHuman(timer.nanosPerOperation(readCount)));
|
||||
|
||||
assertEquals("last read in " + in, -1, in.read());
|
||||
}
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in New Issue