HBASE-2324 Refactoring of TableRecordReader (mapred / mapreduce) for reuse outside the scope of InputSplit / RecordReader
git-svn-id: https://svn.apache.org/repos/asf/hadoop/hbase/trunk@923404 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Michael Stack
parent
11999bd2b3
commit
9013c837e8
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@ -434,6 +434,8 @@ Release 0.21.0 - Unreleased
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(Kay Kay via Stack)
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HBASE-2279 Hbase Shell does not have any tests (Alexey Kovyrin via Stack)
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HBASE-2314 [shell] Support for getting counters (Alexey Kovyrin via Stack)
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HBASE-2324 Refactoring of TableRecordReader (mapred / mapreduce) for reuse
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outside the scope of InputSplit / RecordReader (Kay Kay via Stack)
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NEW FEATURES
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HBASE-1961 HBase EC2 scripts
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@ -24,23 +24,16 @@ import java.io.IOException;
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import org.apache.commons.logging.Log;
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import org.apache.commons.logging.LogFactory;
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import org.apache.hadoop.hbase.HConstants;
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import org.apache.hadoop.hbase.UnknownScannerException;
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import org.apache.hadoop.hbase.HBaseConfiguration;
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import org.apache.hadoop.hbase.client.HTable;
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import org.apache.hadoop.hbase.client.Result;
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import org.apache.hadoop.hbase.client.Scan;
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import org.apache.hadoop.hbase.client.ResultScanner;
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import org.apache.hadoop.hbase.filter.Filter;
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import org.apache.hadoop.hbase.io.ImmutableBytesWritable;
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import org.apache.hadoop.hbase.regionserver.HRegion;
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import org.apache.hadoop.hbase.util.Writables;
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import org.apache.hadoop.hbase.util.Bytes;
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import org.apache.hadoop.mapred.InputFormat;
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import org.apache.hadoop.mapred.InputSplit;
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import org.apache.hadoop.mapred.JobConf;
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import org.apache.hadoop.mapred.RecordReader;
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import org.apache.hadoop.mapred.Reporter;
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import org.apache.hadoop.util.StringUtils;
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/**
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* A Base for {@link TableInputFormat}s. Receives a {@link HTable}, a
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@ -80,157 +73,6 @@ implements InputFormat<ImmutableBytesWritable, Result> {
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private TableRecordReader tableRecordReader;
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private Filter rowFilter;
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/**
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* Iterate over an HBase table data, return (Text, RowResult) pairs
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*/
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protected class TableRecordReader
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implements RecordReader<ImmutableBytesWritable, Result> {
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private byte [] startRow;
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private byte [] endRow;
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private byte [] lastRow;
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private Filter trrRowFilter;
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private ResultScanner scanner;
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private HTable htable;
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private byte [][] trrInputColumns;
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/**
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* Restart from survivable exceptions by creating a new scanner.
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*
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* @param firstRow
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* @throws IOException
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*/
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public void restart(byte[] firstRow) throws IOException {
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if ((endRow != null) && (endRow.length > 0)) {
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if (trrRowFilter != null) {
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Scan scan = new Scan(firstRow, endRow);
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scan.addColumns(trrInputColumns);
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scan.setFilter(trrRowFilter);
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this.scanner = this.htable.getScanner(scan);
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} else {
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LOG.debug("TIFB.restart, firstRow: " +
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Bytes.toStringBinary(firstRow) + ", endRow: " +
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Bytes.toStringBinary(endRow));
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Scan scan = new Scan(firstRow, endRow);
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scan.addColumns(trrInputColumns);
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this.scanner = this.htable.getScanner(scan);
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}
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} else {
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LOG.debug("TIFB.restart, firstRow: " +
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Bytes.toStringBinary(firstRow) + ", no endRow");
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Scan scan = new Scan(firstRow);
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scan.addColumns(trrInputColumns);
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// scan.setFilter(trrRowFilter);
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this.scanner = this.htable.getScanner(scan);
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}
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}
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/**
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* Build the scanner. Not done in constructor to allow for extension.
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*
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* @throws IOException
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*/
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public void init() throws IOException {
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restart(startRow);
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}
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/**
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* @param htable the {@link HTable} to scan.
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*/
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public void setHTable(HTable htable) {
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this.htable = htable;
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}
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/**
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* @param inputColumns the columns to be placed in {@link Result}.
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*/
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public void setInputColumns(final byte [][] inputColumns) {
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this.trrInputColumns = inputColumns;
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}
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/**
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* @param startRow the first row in the split
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*/
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public void setStartRow(final byte [] startRow) {
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this.startRow = startRow;
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}
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/**
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*
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* @param endRow the last row in the split
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*/
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public void setEndRow(final byte [] endRow) {
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this.endRow = endRow;
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}
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/**
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* @param rowFilter the {@link Filter} to be used.
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*/
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public void setRowFilter(Filter rowFilter) {
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this.trrRowFilter = rowFilter;
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}
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public void close() {
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this.scanner.close();
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}
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/**
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* @return ImmutableBytesWritable
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*
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* @see org.apache.hadoop.mapred.RecordReader#createKey()
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*/
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public ImmutableBytesWritable createKey() {
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return new ImmutableBytesWritable();
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}
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/**
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* @return RowResult
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*
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* @see org.apache.hadoop.mapred.RecordReader#createValue()
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*/
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public Result createValue() {
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return new Result();
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}
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public long getPos() {
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// This should be the ordinal tuple in the range;
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// not clear how to calculate...
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return 0;
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}
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public float getProgress() {
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// Depends on the total number of tuples and getPos
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return 0;
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}
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/**
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* @param key HStoreKey as input key.
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* @param value MapWritable as input value
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* @return true if there was more data
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* @throws IOException
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*/
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public boolean next(ImmutableBytesWritable key, Result value)
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throws IOException {
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Result result;
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try {
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result = this.scanner.next();
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} catch (UnknownScannerException e) {
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LOG.debug("recovered from " + StringUtils.stringifyException(e));
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restart(lastRow);
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this.scanner.next(); // skip presumed already mapped row
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result = this.scanner.next();
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}
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if (result != null && result.size() > 0) {
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key.set(result.getRow());
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lastRow = key.get();
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Writables.copyWritable(result, value);
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return true;
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}
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return false;
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}
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}
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/**
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* Builds a TableRecordReader. If no TableRecordReader was provided, uses
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* the default.
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@ -0,0 +1,138 @@
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/**
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* Copyright 2010 The Apache Software Foundation
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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.hbase.mapred;
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import java.io.IOException;
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import org.apache.hadoop.hbase.client.HTable;
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import org.apache.hadoop.hbase.client.Result;
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import org.apache.hadoop.hbase.filter.Filter;
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import org.apache.hadoop.hbase.io.ImmutableBytesWritable;
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import org.apache.hadoop.mapred.RecordReader;
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/**
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* Iterate over an HBase table data, return (Text, RowResult) pairs
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*/
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public class TableRecordReader
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implements RecordReader<ImmutableBytesWritable, Result> {
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private TableRecordReaderImpl recordReaderImpl = new TableRecordReaderImpl();
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/**
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* Restart from survivable exceptions by creating a new scanner.
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*
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* @param firstRow
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* @throws IOException
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*/
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public void restart(byte[] firstRow) throws IOException {
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this.recordReaderImpl.restart(firstRow);
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}
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/**
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* Build the scanner. Not done in constructor to allow for extension.
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*
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* @throws IOException
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*/
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public void init() throws IOException {
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this.recordReaderImpl.restart(this.recordReaderImpl.getStartRow());
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}
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/**
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* @param htable the {@link HTable} to scan.
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*/
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public void setHTable(HTable htable) {
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this.recordReaderImpl.setHTable(htable);
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}
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/**
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* @param inputColumns the columns to be placed in {@link Result}.
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*/
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public void setInputColumns(final byte [][] inputColumns) {
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this.recordReaderImpl.setInputColumns(inputColumns);
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}
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/**
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* @param startRow the first row in the split
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*/
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public void setStartRow(final byte [] startRow) {
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this.recordReaderImpl.setStartRow(startRow);
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}
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/**
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*
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* @param endRow the last row in the split
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*/
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public void setEndRow(final byte [] endRow) {
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this.recordReaderImpl.setEndRow(endRow);
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}
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/**
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* @param rowFilter the {@link Filter} to be used.
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*/
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public void setRowFilter(Filter rowFilter) {
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this.recordReaderImpl.setRowFilter(rowFilter);
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}
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public void close() {
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this.recordReaderImpl.close();
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}
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/**
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* @return ImmutableBytesWritable
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*
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* @see org.apache.hadoop.mapred.RecordReader#createKey()
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*/
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public ImmutableBytesWritable createKey() {
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return this.recordReaderImpl.createKey();
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}
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/**
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* @return RowResult
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*
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* @see org.apache.hadoop.mapred.RecordReader#createValue()
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*/
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public Result createValue() {
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return this.recordReaderImpl.createValue();
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}
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public long getPos() {
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// This should be the ordinal tuple in the range;
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// not clear how to calculate...
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return this.recordReaderImpl.getPos();
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}
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public float getProgress() {
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// Depends on the total number of tuples and getPos
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return this.recordReaderImpl.getPos();
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}
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/**
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* @param key HStoreKey as input key.
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* @param value MapWritable as input value
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* @return true if there was more data
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* @throws IOException
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*/
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public boolean next(ImmutableBytesWritable key, Result value)
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throws IOException {
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return this.recordReaderImpl.next(key, value);
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}
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}
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@ -0,0 +1,192 @@
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/**
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* Copyright 2010 The Apache Software Foundation
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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.hbase.mapred;
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import java.io.IOException;
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import org.apache.commons.logging.Log;
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import org.apache.commons.logging.LogFactory;
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import org.apache.hadoop.hbase.UnknownScannerException;
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import org.apache.hadoop.hbase.client.HTable;
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import org.apache.hadoop.hbase.client.Result;
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import org.apache.hadoop.hbase.client.ResultScanner;
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import org.apache.hadoop.hbase.client.Scan;
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import org.apache.hadoop.hbase.filter.Filter;
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import org.apache.hadoop.hbase.io.ImmutableBytesWritable;
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import org.apache.hadoop.hbase.util.Bytes;
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import org.apache.hadoop.hbase.util.Writables;
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import org.apache.hadoop.util.StringUtils;
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/**
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* Iterate over an HBase table data, return (Text, RowResult) pairs
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*/
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public class TableRecordReaderImpl {
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static final Log LOG = LogFactory.getLog(TableRecordReaderImpl.class);
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private byte [] startRow;
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private byte [] endRow;
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private byte [] lastRow;
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private Filter trrRowFilter;
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private ResultScanner scanner;
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private HTable htable;
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private byte [][] trrInputColumns;
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/**
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* Restart from survivable exceptions by creating a new scanner.
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*
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* @param firstRow
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* @throws IOException
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*/
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public void restart(byte[] firstRow) throws IOException {
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if ((endRow != null) && (endRow.length > 0)) {
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if (trrRowFilter != null) {
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Scan scan = new Scan(firstRow, endRow);
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scan.addColumns(trrInputColumns);
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scan.setFilter(trrRowFilter);
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this.scanner = this.htable.getScanner(scan);
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} else {
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LOG.debug("TIFB.restart, firstRow: " +
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Bytes.toStringBinary(firstRow) + ", endRow: " +
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Bytes.toStringBinary(endRow));
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Scan scan = new Scan(firstRow, endRow);
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scan.addColumns(trrInputColumns);
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this.scanner = this.htable.getScanner(scan);
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}
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} else {
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LOG.debug("TIFB.restart, firstRow: " +
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Bytes.toStringBinary(firstRow) + ", no endRow");
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Scan scan = new Scan(firstRow);
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scan.addColumns(trrInputColumns);
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// scan.setFilter(trrRowFilter);
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this.scanner = this.htable.getScanner(scan);
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}
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}
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/**
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* Build the scanner. Not done in constructor to allow for extension.
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*
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* @throws IOException
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*/
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public void init() throws IOException {
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restart(startRow);
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}
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byte[] getStartRow() {
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return this.startRow;
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}
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/**
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* @param htable the {@link HTable} to scan.
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*/
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public void setHTable(HTable htable) {
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this.htable = htable;
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}
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/**
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* @param inputColumns the columns to be placed in {@link Result}.
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*/
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public void setInputColumns(final byte [][] inputColumns) {
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this.trrInputColumns = inputColumns;
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}
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/**
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* @param startRow the first row in the split
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*/
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public void setStartRow(final byte [] startRow) {
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this.startRow = startRow;
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}
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/**
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*
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* @param endRow the last row in the split
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*/
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public void setEndRow(final byte [] endRow) {
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this.endRow = endRow;
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||||
}
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/**
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* @param rowFilter the {@link Filter} to be used.
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*/
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||||
public void setRowFilter(Filter rowFilter) {
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this.trrRowFilter = rowFilter;
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}
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||||
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public void close() {
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this.scanner.close();
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}
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/**
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* @return ImmutableBytesWritable
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*
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* @see org.apache.hadoop.mapred.RecordReader#createKey()
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*/
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public ImmutableBytesWritable createKey() {
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return new ImmutableBytesWritable();
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}
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/**
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* @return RowResult
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*
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* @see org.apache.hadoop.mapred.RecordReader#createValue()
|
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*/
|
||||
public Result createValue() {
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return new Result();
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||||
}
|
||||
|
||||
public long getPos() {
|
||||
// This should be the ordinal tuple in the range;
|
||||
// not clear how to calculate...
|
||||
return 0;
|
||||
}
|
||||
|
||||
public float getProgress() {
|
||||
// Depends on the total number of tuples and getPos
|
||||
return 0;
|
||||
}
|
||||
|
||||
/**
|
||||
* @param key HStoreKey as input key.
|
||||
* @param value MapWritable as input value
|
||||
* @return true if there was more data
|
||||
* @throws IOException
|
||||
*/
|
||||
public boolean next(ImmutableBytesWritable key, Result value)
|
||||
throws IOException {
|
||||
Result result;
|
||||
try {
|
||||
result = this.scanner.next();
|
||||
} catch (UnknownScannerException e) {
|
||||
LOG.debug("recovered from " + StringUtils.stringifyException(e));
|
||||
restart(lastRow);
|
||||
this.scanner.next(); // skip presumed already mapped row
|
||||
result = this.scanner.next();
|
||||
}
|
||||
|
||||
if (result != null && result.size() > 0) {
|
||||
key.set(result.getRow());
|
||||
lastRow = key.get();
|
||||
Writables.copyWritable(result, value);
|
||||
return true;
|
||||
}
|
||||
return false;
|
||||
}
|
||||
}
|
||||
|
|
@ -79,154 +79,7 @@ extends InputFormat<ImmutableBytesWritable, Result> {
|
|||
/** The reader scanning the table, can be a custom one. */
|
||||
private TableRecordReader tableRecordReader = null;
|
||||
|
||||
/**
|
||||
* Iterate over an HBase table data, return (ImmutableBytesWritable, Result)
|
||||
* pairs.
|
||||
*/
|
||||
protected class TableRecordReader
|
||||
extends RecordReader<ImmutableBytesWritable, Result> {
|
||||
|
||||
private ResultScanner scanner = null;
|
||||
private Scan scan = null;
|
||||
private HTable htable = null;
|
||||
private byte[] lastRow = null;
|
||||
private ImmutableBytesWritable key = null;
|
||||
private Result value = null;
|
||||
|
||||
/**
|
||||
* Restart from survivable exceptions by creating a new scanner.
|
||||
*
|
||||
* @param firstRow The first row to start at.
|
||||
* @throws IOException When restarting fails.
|
||||
*/
|
||||
public void restart(byte[] firstRow) throws IOException {
|
||||
Scan newScan = new Scan(scan);
|
||||
newScan.setStartRow(firstRow);
|
||||
this.scanner = this.htable.getScanner(newScan);
|
||||
}
|
||||
|
||||
/**
|
||||
* Build the scanner. Not done in constructor to allow for extension.
|
||||
*
|
||||
* @throws IOException When restarting the scan fails.
|
||||
*/
|
||||
public void init() throws IOException {
|
||||
restart(scan.getStartRow());
|
||||
}
|
||||
|
||||
/**
|
||||
* Sets the HBase table.
|
||||
*
|
||||
* @param htable The {@link HTable} to scan.
|
||||
*/
|
||||
public void setHTable(HTable htable) {
|
||||
this.htable = htable;
|
||||
}
|
||||
|
||||
/**
|
||||
* Sets the scan defining the actual details like columns etc.
|
||||
*
|
||||
* @param scan The scan to set.
|
||||
*/
|
||||
public void setScan(Scan scan) {
|
||||
this.scan = scan;
|
||||
}
|
||||
|
||||
/**
|
||||
* Closes the split.
|
||||
*
|
||||
* @see org.apache.hadoop.mapreduce.RecordReader#close()
|
||||
*/
|
||||
@Override
|
||||
public void close() {
|
||||
this.scanner.close();
|
||||
}
|
||||
|
||||
/**
|
||||
* Returns the current key.
|
||||
*
|
||||
* @return The current key.
|
||||
* @throws IOException
|
||||
* @throws InterruptedException When the job is aborted.
|
||||
* @see org.apache.hadoop.mapreduce.RecordReader#getCurrentKey()
|
||||
*/
|
||||
@Override
|
||||
public ImmutableBytesWritable getCurrentKey() throws IOException,
|
||||
InterruptedException {
|
||||
return key;
|
||||
}
|
||||
|
||||
/**
|
||||
* Returns the current value.
|
||||
*
|
||||
* @return The current value.
|
||||
* @throws IOException When the value is faulty.
|
||||
* @throws InterruptedException When the job is aborted.
|
||||
* @see org.apache.hadoop.mapreduce.RecordReader#getCurrentValue()
|
||||
*/
|
||||
@Override
|
||||
public Result getCurrentValue() throws IOException, InterruptedException {
|
||||
return value;
|
||||
}
|
||||
|
||||
/**
|
||||
* Initializes the reader.
|
||||
*
|
||||
* @param inputsplit The split to work with.
|
||||
* @param context The current task context.
|
||||
* @throws IOException When setting up the reader fails.
|
||||
* @throws InterruptedException When the job is aborted.
|
||||
* @see org.apache.hadoop.mapreduce.RecordReader#initialize(
|
||||
* org.apache.hadoop.mapreduce.InputSplit,
|
||||
* org.apache.hadoop.mapreduce.TaskAttemptContext)
|
||||
*/
|
||||
@Override
|
||||
public void initialize(InputSplit inputsplit,
|
||||
TaskAttemptContext context) throws IOException,
|
||||
InterruptedException {
|
||||
}
|
||||
|
||||
/**
|
||||
* Positions the record reader to the next record.
|
||||
*
|
||||
* @return <code>true</code> if there was another record.
|
||||
* @throws IOException When reading the record failed.
|
||||
* @throws InterruptedException When the job was aborted.
|
||||
* @see org.apache.hadoop.mapreduce.RecordReader#nextKeyValue()
|
||||
*/
|
||||
@Override
|
||||
public boolean nextKeyValue() throws IOException, InterruptedException {
|
||||
if (key == null) key = new ImmutableBytesWritable();
|
||||
if (value == null) value = new Result();
|
||||
try {
|
||||
value = this.scanner.next();
|
||||
} catch (IOException e) {
|
||||
LOG.debug("recovered from " + StringUtils.stringifyException(e));
|
||||
restart(lastRow);
|
||||
scanner.next(); // skip presumed already mapped row
|
||||
value = scanner.next();
|
||||
}
|
||||
if (value != null && value.size() > 0) {
|
||||
key.set(value.getRow());
|
||||
lastRow = key.get();
|
||||
return true;
|
||||
}
|
||||
return false;
|
||||
}
|
||||
|
||||
/**
|
||||
* The current progress of the record reader through its data.
|
||||
*
|
||||
* @return A number between 0.0 and 1.0, the fraction of the data read.
|
||||
* @see org.apache.hadoop.mapreduce.RecordReader#getProgress()
|
||||
*/
|
||||
@Override
|
||||
public float getProgress() {
|
||||
// Depends on the total number of tuples
|
||||
return 0;
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
/**
|
||||
* Builds a TableRecordReader. If no TableRecordReader was provided, uses
|
||||
* the default.
|
||||
|
|
|
|||
|
|
@ -0,0 +1,155 @@
|
|||
/**
|
||||
* Copyright 2010 The Apache Software Foundation
|
||||
*
|
||||
* 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.hbase.mapreduce;
|
||||
|
||||
import java.io.IOException;
|
||||
|
||||
import org.apache.hadoop.hbase.client.HTable;
|
||||
import org.apache.hadoop.hbase.client.Result;
|
||||
import org.apache.hadoop.hbase.client.Scan;
|
||||
import org.apache.hadoop.hbase.io.ImmutableBytesWritable;
|
||||
import org.apache.hadoop.mapreduce.InputSplit;
|
||||
import org.apache.hadoop.mapreduce.RecordReader;
|
||||
import org.apache.hadoop.mapreduce.TaskAttemptContext;
|
||||
|
||||
/**
|
||||
* Iterate over an HBase table data, return (ImmutableBytesWritable, Result)
|
||||
* pairs.
|
||||
*/
|
||||
public class TableRecordReader
|
||||
extends RecordReader<ImmutableBytesWritable, Result> {
|
||||
|
||||
private TableRecordReaderImpl recordReaderImpl = new TableRecordReaderImpl();
|
||||
|
||||
/**
|
||||
* Restart from survivable exceptions by creating a new scanner.
|
||||
*
|
||||
* @param firstRow The first row to start at.
|
||||
* @throws IOException When restarting fails.
|
||||
*/
|
||||
public void restart(byte[] firstRow) throws IOException {
|
||||
this.recordReaderImpl.restart(firstRow);
|
||||
}
|
||||
|
||||
/**
|
||||
* Build the scanner. Not done in constructor to allow for extension.
|
||||
*
|
||||
* @throws IOException When restarting the scan fails.
|
||||
*/
|
||||
public void init() throws IOException {
|
||||
this.recordReaderImpl.init();
|
||||
}
|
||||
|
||||
/**
|
||||
* Sets the HBase table.
|
||||
*
|
||||
* @param htable The {@link HTable} to scan.
|
||||
*/
|
||||
public void setHTable(HTable htable) {
|
||||
this.recordReaderImpl.setHTable(htable);
|
||||
}
|
||||
|
||||
/**
|
||||
* Sets the scan defining the actual details like columns etc.
|
||||
*
|
||||
* @param scan The scan to set.
|
||||
*/
|
||||
public void setScan(Scan scan) {
|
||||
this.recordReaderImpl.setScan(scan);
|
||||
}
|
||||
|
||||
/**
|
||||
* Closes the split.
|
||||
*
|
||||
* @see org.apache.hadoop.mapreduce.RecordReader#close()
|
||||
*/
|
||||
@Override
|
||||
public void close() {
|
||||
this.recordReaderImpl.close();
|
||||
}
|
||||
|
||||
/**
|
||||
* Returns the current key.
|
||||
*
|
||||
* @return The current key.
|
||||
* @throws IOException
|
||||
* @throws InterruptedException When the job is aborted.
|
||||
* @see org.apache.hadoop.mapreduce.RecordReader#getCurrentKey()
|
||||
*/
|
||||
@Override
|
||||
public ImmutableBytesWritable getCurrentKey() throws IOException,
|
||||
InterruptedException {
|
||||
return this.recordReaderImpl.getCurrentKey();
|
||||
}
|
||||
|
||||
/**
|
||||
* Returns the current value.
|
||||
*
|
||||
* @return The current value.
|
||||
* @throws IOException When the value is faulty.
|
||||
* @throws InterruptedException When the job is aborted.
|
||||
* @see org.apache.hadoop.mapreduce.RecordReader#getCurrentValue()
|
||||
*/
|
||||
@Override
|
||||
public Result getCurrentValue() throws IOException, InterruptedException {
|
||||
return this.recordReaderImpl.getCurrentValue();
|
||||
}
|
||||
|
||||
/**
|
||||
* Initializes the reader.
|
||||
*
|
||||
* @param inputsplit The split to work with.
|
||||
* @param context The current task context.
|
||||
* @throws IOException When setting up the reader fails.
|
||||
* @throws InterruptedException When the job is aborted.
|
||||
* @see org.apache.hadoop.mapreduce.RecordReader#initialize(
|
||||
* org.apache.hadoop.mapreduce.InputSplit,
|
||||
* org.apache.hadoop.mapreduce.TaskAttemptContext)
|
||||
*/
|
||||
@Override
|
||||
public void initialize(InputSplit inputsplit,
|
||||
TaskAttemptContext context) throws IOException,
|
||||
InterruptedException {
|
||||
}
|
||||
|
||||
/**
|
||||
* Positions the record reader to the next record.
|
||||
*
|
||||
* @return <code>true</code> if there was another record.
|
||||
* @throws IOException When reading the record failed.
|
||||
* @throws InterruptedException When the job was aborted.
|
||||
* @see org.apache.hadoop.mapreduce.RecordReader#nextKeyValue()
|
||||
*/
|
||||
@Override
|
||||
public boolean nextKeyValue() throws IOException, InterruptedException {
|
||||
return this.recordReaderImpl.nextKeyValue();
|
||||
}
|
||||
|
||||
/**
|
||||
* The current progress of the record reader through its data.
|
||||
*
|
||||
* @return A number between 0.0 and 1.0, the fraction of the data read.
|
||||
* @see org.apache.hadoop.mapreduce.RecordReader#getProgress()
|
||||
*/
|
||||
@Override
|
||||
public float getProgress() {
|
||||
return this.recordReaderImpl.getProgress();
|
||||
}
|
||||
}
|
||||
|
|
@ -0,0 +1,157 @@
|
|||
/**
|
||||
* Copyright 2010 The Apache Software Foundation
|
||||
*
|
||||
* 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.hbase.mapreduce;
|
||||
|
||||
import java.io.IOException;
|
||||
|
||||
import org.apache.commons.logging.Log;
|
||||
import org.apache.commons.logging.LogFactory;
|
||||
import org.apache.hadoop.hbase.client.HTable;
|
||||
import org.apache.hadoop.hbase.client.Result;
|
||||
import org.apache.hadoop.hbase.client.ResultScanner;
|
||||
import org.apache.hadoop.hbase.client.Scan;
|
||||
import org.apache.hadoop.hbase.io.ImmutableBytesWritable;
|
||||
import org.apache.hadoop.util.StringUtils;
|
||||
|
||||
/**
|
||||
* Iterate over an HBase table data, return (ImmutableBytesWritable, Result)
|
||||
* pairs.
|
||||
*/
|
||||
public class TableRecordReaderImpl {
|
||||
|
||||
|
||||
static final Log LOG = LogFactory.getLog(TableRecordReader.class);
|
||||
|
||||
private ResultScanner scanner = null;
|
||||
private Scan scan = null;
|
||||
private HTable htable = null;
|
||||
private byte[] lastRow = null;
|
||||
private ImmutableBytesWritable key = null;
|
||||
private Result value = null;
|
||||
|
||||
/**
|
||||
* Restart from survivable exceptions by creating a new scanner.
|
||||
*
|
||||
* @param firstRow The first row to start at.
|
||||
* @throws IOException When restarting fails.
|
||||
*/
|
||||
public void restart(byte[] firstRow) throws IOException {
|
||||
Scan newScan = new Scan(scan);
|
||||
newScan.setStartRow(firstRow);
|
||||
this.scanner = this.htable.getScanner(newScan);
|
||||
}
|
||||
|
||||
/**
|
||||
* Build the scanner. Not done in constructor to allow for extension.
|
||||
*
|
||||
* @throws IOException When restarting the scan fails.
|
||||
*/
|
||||
public void init() throws IOException {
|
||||
restart(scan.getStartRow());
|
||||
}
|
||||
|
||||
/**
|
||||
* Sets the HBase table.
|
||||
*
|
||||
* @param htable The {@link HTable} to scan.
|
||||
*/
|
||||
public void setHTable(HTable htable) {
|
||||
this.htable = htable;
|
||||
}
|
||||
|
||||
/**
|
||||
* Sets the scan defining the actual details like columns etc.
|
||||
*
|
||||
* @param scan The scan to set.
|
||||
*/
|
||||
public void setScan(Scan scan) {
|
||||
this.scan = scan;
|
||||
}
|
||||
|
||||
/**
|
||||
* Closes the split.
|
||||
*
|
||||
*
|
||||
*/
|
||||
public void close() {
|
||||
this.scanner.close();
|
||||
}
|
||||
|
||||
/**
|
||||
* Returns the current key.
|
||||
*
|
||||
* @return The current key.
|
||||
* @throws IOException
|
||||
* @throws InterruptedException When the job is aborted.
|
||||
*/
|
||||
public ImmutableBytesWritable getCurrentKey() throws IOException,
|
||||
InterruptedException {
|
||||
return key;
|
||||
}
|
||||
|
||||
/**
|
||||
* Returns the current value.
|
||||
*
|
||||
* @return The current value.
|
||||
* @throws IOException When the value is faulty.
|
||||
* @throws InterruptedException When the job is aborted.
|
||||
*/
|
||||
public Result getCurrentValue() throws IOException, InterruptedException {
|
||||
return value;
|
||||
}
|
||||
|
||||
|
||||
/**
|
||||
* Positions the record reader to the next record.
|
||||
*
|
||||
* @return <code>true</code> if there was another record.
|
||||
* @throws IOException When reading the record failed.
|
||||
* @throws InterruptedException When the job was aborted.
|
||||
*/
|
||||
public boolean nextKeyValue() throws IOException, InterruptedException {
|
||||
if (key == null) key = new ImmutableBytesWritable();
|
||||
if (value == null) value = new Result();
|
||||
try {
|
||||
value = this.scanner.next();
|
||||
} catch (IOException e) {
|
||||
LOG.debug("recovered from " + StringUtils.stringifyException(e));
|
||||
restart(lastRow);
|
||||
scanner.next(); // skip presumed already mapped row
|
||||
value = scanner.next();
|
||||
}
|
||||
if (value != null && value.size() > 0) {
|
||||
key.set(value.getRow());
|
||||
lastRow = key.get();
|
||||
return true;
|
||||
}
|
||||
return false;
|
||||
}
|
||||
|
||||
/**
|
||||
* The current progress of the record reader through its data.
|
||||
*
|
||||
* @return A number between 0.0 and 1.0, the fraction of the data read.
|
||||
*/
|
||||
public float getProgress() {
|
||||
// Depends on the total number of tuples
|
||||
return 0;
|
||||
}
|
||||
|
||||
}
|
||||
Loading…
Reference in New Issue