HBASE-13014 Java Tool For Region Moving (Abhishek Singh Chouhan)
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/**
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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.util;
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import java.io.BufferedReader;
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import java.io.DataInputStream;
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import java.io.DataOutputStream;
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import java.io.File;
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import java.io.FileInputStream;
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import java.io.FileOutputStream;
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import java.io.FileReader;
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import java.io.IOException;
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import java.util.ArrayList;
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import java.util.Collections;
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import java.util.Iterator;
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import java.util.List;
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import java.util.concurrent.Callable;
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import java.util.concurrent.CancellationException;
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import java.util.concurrent.ExecutionException;
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import java.util.concurrent.ExecutorService;
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import java.util.concurrent.Executors;
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import java.util.concurrent.Future;
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import java.util.concurrent.TimeUnit;
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import java.util.concurrent.TimeoutException;
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import org.apache.commons.cli.CommandLine;
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import org.apache.hadoop.conf.Configuration;
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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.HBaseConfiguration;
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import org.apache.hadoop.hbase.HConstants;
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import org.apache.hadoop.hbase.HRegionInfo;
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import org.apache.hadoop.hbase.ServerName;
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import org.apache.hadoop.hbase.TableName;
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import org.apache.hadoop.hbase.classification.InterfaceAudience;
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import org.apache.hadoop.hbase.client.Admin;
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import org.apache.hadoop.hbase.client.Connection;
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import org.apache.hadoop.hbase.client.ConnectionFactory;
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import org.apache.hadoop.hbase.client.Get;
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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.client.Table;
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import org.apache.hadoop.hbase.filter.FirstKeyOnlyFilter;
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import org.apache.hadoop.hbase.zookeeper.MetaTableLocator;
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import org.apache.hadoop.hbase.zookeeper.ZooKeeperWatcher;
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/**
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* Tool for loading/unloading regions to/from given regionserver This tool can be run from Command
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* line directly as a utility. Supports Ack/No Ack mode for loading/unloading operations.Ack mode
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* acknowledges if regions are online after movement while noAck mode is best effort mode that
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* improves performance but will still move on if region is stuck/not moved. Motivation behind noAck
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* mode being RS shutdown where even if a Region is stuck, upon shutdown master will move it
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* anyways. This can also be used by constructiong an Object using the builder and then calling
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* {@link #load()} or {@link #unload()} methods for the desired operations.
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*/
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@InterfaceAudience.Public
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public class RegionMover extends AbstractHBaseTool {
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public static final String MOVE_RETRIES_MAX_KEY = "hbase.move.retries.max";
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public static final String MOVE_WAIT_MAX_KEY = "hbase.move.wait.max";
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public static final String SERVERSTART_WAIT_MAX_KEY = "hbase.serverstart.wait.max";
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public static final int DEFAULT_MOVE_RETRIES_MAX = 5;
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public static final int DEFAULT_MOVE_WAIT_MAX = 60;
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public static final int DEFAULT_SERVERSTART_WAIT_MAX = 180;
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static final Log LOG = LogFactory.getLog(RegionMover.class);
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private RegionMoverBuilder rmbuilder;
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private boolean ack = true;
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private int maxthreads = 1;
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private int timeout;
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private String loadUnload;
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private String hostname;
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private String filename;
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private String excludeFile;
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private int port;
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private RegionMover(RegionMoverBuilder builder) {
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this.hostname = builder.hostname;
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this.filename = builder.filename;
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this.excludeFile = builder.excludeFile;
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this.maxthreads = builder.maxthreads;
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this.ack = builder.ack;
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this.port = builder.port;
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this.timeout = builder.timeout;
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}
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private RegionMover() {
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}
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/**
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* Builder for Region mover.Use the {@link #build()} method to create {@link #RegionMover(String)}
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* object Has {@link #filename(String)}, {@link #excludeFile(String)}, {@link #maxthreads(int)},
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* {@link #ack(boolean)}, {@link #timeout(int)} methods to set the corresponding options
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*/
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public static class RegionMoverBuilder {
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private boolean ack = true;
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private int maxthreads = 1;
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private int timeout = Integer.MAX_VALUE;
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private String hostname;
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private String filename;
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private String excludeFile = null;
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private String defaultDir = "/tmp";
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private int port = HConstants.DEFAULT_REGIONSERVER_PORT;
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/**
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* Hostname to unload regions from or load regions to Valid format: <hostname> or
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* <hostname:port>
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* @param hostname
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*/
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public RegionMoverBuilder(String hostname) {
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String[] splitHostname = hostname.split(":");
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this.hostname = splitHostname[0];
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if (splitHostname.length == 2) {
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this.port = Integer.parseInt(splitHostname[1]);
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}
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setDefaultfilename(this.hostname);
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}
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private void setDefaultfilename(String hostname) {
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this.filename =
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defaultDir + "/" + System.getProperty("user.name") + this.hostname + ":"
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+ Integer.toString(this.port);
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}
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/**
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* Path of file where regions will be written to during unloading/read from during loading
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* @param filename
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* @return RegionMoverBuilder object
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*/
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public RegionMoverBuilder filename(String filename) {
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this.filename = filename;
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return this;
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}
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/**
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* Set the max number of threads that will be used to move regions
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* @param threads
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* @return RegionMoverBuilder object
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*/
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public RegionMoverBuilder maxthreads(int threads) {
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this.maxthreads = threads;
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return this;
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}
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/**
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* Path of file containing hostnames to be excluded during region movement Exclude file should
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* have <host:port> per line.Port is mandatory here as we can have many RS running on a single
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* host
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* @param excludefile
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* @return RegionMoverBuilder object
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*/
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public RegionMoverBuilder excludeFile(String excludefile) {
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this.excludeFile = excludefile;
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return this;
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}
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/**
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* Set ack/noAck mode.
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* <p>
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* In ack mode regions are acknowledged before and after moving and the move is retried
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* hbase.move.retries.max times, if unsuccessful we quit with exit code 1.No Ack mode is a best
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* effort mode,each region movement is tried once.This can be used during graceful shutdown as
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* even if we have a stuck region,upon shutdown it'll be reassigned anyway.
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* <p>
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* @param ack
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* @return RegionMoverBuilder object
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*/
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public RegionMoverBuilder ack(boolean ack) {
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this.ack = ack;
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return this;
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}
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/**
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* Set the timeout for Load/Unload operation in seconds.This is a global timeout,threadpool for
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* movers also have a separate time which is hbase.move.wait.max * number of regions to
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* load/unload
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* @param timeout in seconds
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* @return RegionMoverBuilder object
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*/
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public RegionMoverBuilder timeout(int timeout) {
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this.timeout = timeout;
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return this;
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}
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/**
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* This method builds the appropriate RegionMover object which can then be used to load/unload
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* using load and unload methods
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* @return RegionMover object
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*/
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public RegionMover build() {
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return new RegionMover(this);
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}
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}
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/**
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* Loads the specified {@link #hostname} with regions listed in the {@link #filename} RegionMover
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* Object has to be created using {@link #RegionMover(RegionMoverBuilder)}
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* @return true if loading succeeded, false otherwise
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* @throws ExecutionException
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* @throws InterruptedException if the loader thread was interrupted
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* @throws TimeoutException
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*/
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public boolean load() throws ExecutionException, InterruptedException, TimeoutException {
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setConf();
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ExecutorService loadPool = Executors.newFixedThreadPool(1);
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Future<Boolean> loadTask = loadPool.submit(new Load(this));
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loadPool.shutdown();
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try {
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if (!loadPool.awaitTermination((long) this.timeout, TimeUnit.SECONDS)) {
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LOG.warn("Timed out before finishing the loading operation. Timeout:" + this.timeout
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+ "sec");
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loadPool.shutdownNow();
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}
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} catch (InterruptedException e) {
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loadPool.shutdownNow();
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Thread.currentThread().interrupt();
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}
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try {
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return loadTask.get(5, TimeUnit.SECONDS);
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} catch (InterruptedException e) {
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LOG.warn("Interrupted while loading Regions on " + this.hostname, e);
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throw e;
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} catch (ExecutionException e) {
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LOG.error("Error while loading regions on RegionServer " + this.hostname, e);
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throw e;
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}
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}
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private class Load implements Callable<Boolean> {
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private RegionMover rm;
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public Load(RegionMover rm) {
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this.rm = rm;
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}
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@Override
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public Boolean call() throws IOException {
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Connection conn = ConnectionFactory.createConnection(rm.conf);
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try {
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List<HRegionInfo> regionsToMove = readRegionsFromFile(rm.filename);
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if (regionsToMove.isEmpty()) {
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LOG.info("No regions to load.Exiting");
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return true;
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}
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Admin admin = conn.getAdmin();
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try {
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loadRegions(admin, rm.hostname, rm.port, regionsToMove, rm.ack);
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} finally {
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admin.close();
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}
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} catch (Exception e) {
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LOG.error("Error while loading regions to " + rm.hostname, e);
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return false;
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} finally {
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conn.close();
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}
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return true;
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}
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}
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/**
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* Unload regions from given {@link #hostname} using ack/noAck mode and {@link #maxthreads}.In
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* noAck mode we do not make sure that region is successfully online on the target region
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* server,hence it is best effort.We do not unload regions to hostnames given in
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* {@link #excludeFile}.
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* @return true if unloading succeeded, false otherwise
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* @throws InterruptedException if the unloader thread was interrupted
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* @throws ExecutionException
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* @throws TimeoutException
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*/
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public boolean unload() throws InterruptedException, ExecutionException, TimeoutException {
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setConf();
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deleteFile(this.filename);
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ExecutorService unloadPool = Executors.newFixedThreadPool(1);
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Future<Boolean> unloadTask = unloadPool.submit(new Unload(this));
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unloadPool.shutdown();
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try {
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if (!unloadPool.awaitTermination((long) this.timeout, TimeUnit.SECONDS)) {
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LOG.warn("Timed out before finishing the unloading operation. Timeout:" + this.timeout
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+ "sec");
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unloadPool.shutdownNow();
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}
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} catch (InterruptedException e) {
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unloadPool.shutdownNow();
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Thread.currentThread().interrupt();
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}
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try {
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return unloadTask.get(5, TimeUnit.SECONDS);
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} catch (InterruptedException e) {
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LOG.warn("Interrupted while unloading Regions from " + this.hostname, e);
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throw e;
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} catch (ExecutionException e) {
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LOG.error("Error while unloading regions from RegionServer " + this.hostname, e);
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throw e;
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}
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}
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private class Unload implements Callable<Boolean> {
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List<HRegionInfo> movedRegions = Collections.synchronizedList(new ArrayList<HRegionInfo>());
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private RegionMover rm;
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public Unload(RegionMover rm) {
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this.rm = rm;
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}
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@Override
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public Boolean call() throws IOException {
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Connection conn = ConnectionFactory.createConnection(rm.conf);
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try {
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Admin admin = conn.getAdmin();
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// Get Online RegionServers
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ArrayList<String> regionServers = getServers(admin);
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if (LOG.isDebugEnabled()) {
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LOG.debug("Online region servers:" + regionServers.toString());
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}
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// Remove the host Region server from target Region Servers list
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String server = stripServer(regionServers, hostname, port);
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// Remove RS present in the exclude file
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stripExcludes(regionServers, rm.excludeFile);
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stripMaster(regionServers, admin);
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unloadRegions(admin, server, regionServers, rm.ack, movedRegions);
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} catch (Exception e) {
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LOG.error("Error while unloading regions ", e);
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return false;
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} finally {
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try {
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conn.close();
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} catch (IOException e) {
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// ignore
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}
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if (movedRegions != null) {
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writeFile(rm.filename, movedRegions);
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}
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}
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return true;
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}
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}
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/**
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* Creates a new configuration if not already set and sets region mover specific overrides
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*/
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private void setConf() {
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if (conf == null) {
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conf = HBaseConfiguration.create();
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conf.setInt("hbase.client.prefetch.limit", 1);
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conf.setInt("hbase.client.pause", 500);
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conf.setInt("hbase.client.retries.number", 100);
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}
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}
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private void loadRegions(Admin admin, String hostname, int port,
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List<HRegionInfo> regionsToMove, boolean ack) throws Exception {
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String server = null;
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List<HRegionInfo> movedRegions = Collections.synchronizedList(new ArrayList<HRegionInfo>());
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int maxWaitInSeconds =
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admin.getConfiguration().getInt(SERVERSTART_WAIT_MAX_KEY, DEFAULT_SERVERSTART_WAIT_MAX);
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long maxWait = EnvironmentEdgeManager.currentTime() + maxWaitInSeconds * 1000;
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while ((EnvironmentEdgeManager.currentTime() < maxWait) && (server == null)) {
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try {
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ArrayList<String> regionServers = getServers(admin);
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// Remove the host Region server from target Region Servers list
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server = stripServer(regionServers, hostname, port);
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if (server != null) {
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break;
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}
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} catch (IOException e) {
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LOG.warn("Could not get list of region servers", e);
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} catch (Exception e) {
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LOG.info("hostname=" + hostname + " is not up yet, waiting", e);
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}
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try {
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Thread.sleep(500);
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} catch (InterruptedException e) {
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LOG.error("Interrupted while waiting for " + hostname + " to be up.Quitting now", e);
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throw e;
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}
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}
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if (server == null) {
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LOG.error("Host:" + hostname + " is not up.Giving up.");
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throw new Exception("Host to load regions not online");
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}
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LOG.info("Moving" + regionsToMove.size() + " regions to " + server + " using "
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+ this.maxthreads + " threads.Ack mode:" + this.ack);
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ExecutorService moveRegionsPool = Executors.newFixedThreadPool(this.maxthreads);
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List<Future<Boolean>> taskList = new ArrayList<Future<Boolean>>();
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int counter = 0;
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while (counter < regionsToMove.size()) {
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HRegionInfo region = regionsToMove.get(counter);
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String currentServer = getServerNameForRegion(admin, region);
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if (currentServer == null) {
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LOG.warn("Could not get server for Region:" + region.getEncodedName() + " moving on");
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counter++;
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continue;
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} else if (server.equals(currentServer)) {
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LOG.info("Region " + region.getRegionNameAsString() + "already on target server=" + server);
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counter++;
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continue;
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}
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if (ack) {
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Future<Boolean> task =
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moveRegionsPool.submit(new MoveWithAck(admin, region, currentServer, server,
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movedRegions));
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taskList.add(task);
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} else {
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Future<Boolean> task =
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moveRegionsPool.submit(new MoveWithoutAck(admin, region, currentServer, server,
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movedRegions));
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taskList.add(task);
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}
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counter++;
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}
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moveRegionsPool.shutdown();
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long timeoutInSeconds =
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regionsToMove.size()
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* admin.getConfiguration().getInt(MOVE_WAIT_MAX_KEY, DEFAULT_MOVE_WAIT_MAX);
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try {
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if (!moveRegionsPool.awaitTermination(timeoutInSeconds, TimeUnit.SECONDS)) {
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moveRegionsPool.shutdownNow();
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}
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} catch (InterruptedException e) {
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moveRegionsPool.shutdownNow();
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Thread.currentThread().interrupt();
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}
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for (Future<Boolean> future : taskList) {
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try {
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// if even after shutdownNow threads are stuck we wait for 5 secs max
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if (!future.get(5, TimeUnit.SECONDS)) {
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LOG.error("Was Not able to move region....Exiting Now");
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throw new Exception("Could not move region Exception");
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}
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} catch (InterruptedException e) {
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LOG.error("Interrupted while waiting for Thread to Complete " + e.getMessage(), e);
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throw e;
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} catch (ExecutionException e) {
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LOG.error("Got Exception From Thread While moving region " + e.getMessage(), e);
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throw e;
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} catch (CancellationException e) {
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LOG.error("Thread for moving region cancelled. Timeout for cancellation:"
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+ timeoutInSeconds + "secs", e);
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throw e;
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}
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}
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}
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||||
private void unloadRegions(Admin admin, String server, ArrayList<String> regionServers,
|
||||
boolean ack, List<HRegionInfo> movedRegions) throws Exception {
|
||||
List<HRegionInfo> regionsToMove = new ArrayList<HRegionInfo>();
|
||||
regionsToMove = getRegions(this.conf, server);
|
||||
if (regionsToMove.size() == 0) {
|
||||
LOG.info("No Regions to move....Quitting now");
|
||||
return;
|
||||
} else if (regionServers.size() == 0) {
|
||||
LOG.warn("No Regions were moved - no servers available");
|
||||
throw new Exception("No online region servers");
|
||||
}
|
||||
while (true) {
|
||||
regionsToMove = getRegions(this.conf, server);
|
||||
regionsToMove.removeAll(movedRegions);
|
||||
if (regionsToMove.size() == 0) {
|
||||
break;
|
||||
}
|
||||
int counter = 0;
|
||||
LOG.info("Moving " + regionsToMove.size() + " regions from " + this.hostname + " to "
|
||||
+ regionServers.size() + " servers using " + this.maxthreads + " threads .Ack Mode:"
|
||||
+ ack);
|
||||
ExecutorService moveRegionsPool = Executors.newFixedThreadPool(this.maxthreads);
|
||||
List<Future<Boolean>> taskList = new ArrayList<Future<Boolean>>();
|
||||
int serverIndex = 0;
|
||||
while (counter < regionsToMove.size()) {
|
||||
if (ack) {
|
||||
Future<Boolean> task =
|
||||
moveRegionsPool.submit(new MoveWithAck(admin, regionsToMove.get(counter), server,
|
||||
regionServers.get(serverIndex), movedRegions));
|
||||
taskList.add(task);
|
||||
} else {
|
||||
Future<Boolean> task =
|
||||
moveRegionsPool.submit(new MoveWithoutAck(admin, regionsToMove.get(counter), server,
|
||||
regionServers.get(serverIndex), movedRegions));
|
||||
taskList.add(task);
|
||||
}
|
||||
counter++;
|
||||
serverIndex = (serverIndex + 1) % regionServers.size();
|
||||
}
|
||||
moveRegionsPool.shutdown();
|
||||
long timeoutInSeconds =
|
||||
regionsToMove.size()
|
||||
* admin.getConfiguration().getInt(MOVE_WAIT_MAX_KEY, DEFAULT_MOVE_WAIT_MAX);
|
||||
try {
|
||||
if (!moveRegionsPool.awaitTermination(timeoutInSeconds, TimeUnit.SECONDS)) {
|
||||
moveRegionsPool.shutdownNow();
|
||||
}
|
||||
} catch (InterruptedException e) {
|
||||
moveRegionsPool.shutdownNow();
|
||||
Thread.currentThread().interrupt();
|
||||
}
|
||||
for (Future<Boolean> future : taskList) {
|
||||
try {
|
||||
// if even after shutdownNow threads are stuck we wait for 5 secs max
|
||||
if (!future.get(5, TimeUnit.SECONDS)) {
|
||||
LOG.error("Was Not able to move region....Exiting Now");
|
||||
throw new Exception("Could not move region Exception");
|
||||
}
|
||||
} catch (InterruptedException e) {
|
||||
LOG.error("Interrupted while waiting for Thread to Complete " + e.getMessage(), e);
|
||||
throw e;
|
||||
} catch (ExecutionException e) {
|
||||
LOG.error("Got Exception From Thread While moving region " + e.getMessage(), e);
|
||||
throw e;
|
||||
} catch (CancellationException e) {
|
||||
LOG.error("Thread for moving region cancelled. Timeout for cancellation:"
|
||||
+ timeoutInSeconds + "secs", e);
|
||||
throw e;
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Move Regions and make sure that they are up on the target server.If a region movement fails we
|
||||
* exit as failure
|
||||
*/
|
||||
private class MoveWithAck implements Callable<Boolean> {
|
||||
private Admin admin;
|
||||
private HRegionInfo region;
|
||||
private String targetServer;
|
||||
private List<HRegionInfo> movedRegions;
|
||||
private String sourceServer;
|
||||
|
||||
public MoveWithAck(Admin admin, HRegionInfo regionInfo, String sourceServer,
|
||||
String targetServer, List<HRegionInfo> movedRegions) {
|
||||
this.admin = admin;
|
||||
this.region = regionInfo;
|
||||
this.targetServer = targetServer;
|
||||
this.movedRegions = movedRegions;
|
||||
this.sourceServer = sourceServer;
|
||||
}
|
||||
|
||||
@Override
|
||||
public Boolean call() throws IOException, InterruptedException {
|
||||
boolean moved = false;
|
||||
int count = 0;
|
||||
int retries = admin.getConfiguration().getInt(MOVE_RETRIES_MAX_KEY, DEFAULT_MOVE_RETRIES_MAX);
|
||||
int maxWaitInSeconds =
|
||||
admin.getConfiguration().getInt(MOVE_WAIT_MAX_KEY, DEFAULT_MOVE_WAIT_MAX);
|
||||
long startTime = EnvironmentEdgeManager.currentTime();
|
||||
boolean sameServer = true;
|
||||
// Assert we can scan the region in its current location
|
||||
isSuccessfulScan(admin, region);
|
||||
LOG.info("Moving region:" + region.getEncodedName() + "from " + sourceServer + " to "
|
||||
+ targetServer);
|
||||
while (count < retries && sameServer) {
|
||||
if (count > 0) {
|
||||
LOG.info("Retry " + Integer.toString(count) + " of maximum " + Integer.toString(retries));
|
||||
}
|
||||
count = count + 1;
|
||||
admin.move(region.getEncodedNameAsBytes(), Bytes.toBytes(targetServer));
|
||||
long maxWait = startTime + (maxWaitInSeconds * 1000);
|
||||
while (EnvironmentEdgeManager.currentTime() < maxWait) {
|
||||
sameServer = isSameServer(admin, region, sourceServer);
|
||||
if (!sameServer) {
|
||||
break;
|
||||
}
|
||||
Thread.sleep(100);
|
||||
}
|
||||
}
|
||||
if (sameServer) {
|
||||
LOG.error("Region: " + region.getRegionNameAsString() + " stuck on " + this.sourceServer
|
||||
+ ",newServer=" + this.targetServer);
|
||||
} else {
|
||||
isSuccessfulScan(admin, region);
|
||||
LOG.info("Moved Region "
|
||||
+ region.getRegionNameAsString()
|
||||
+ " cost:"
|
||||
+ String.format("%.3f",
|
||||
(float) (EnvironmentEdgeManager.currentTime() - startTime) / 1000));
|
||||
moved = true;
|
||||
movedRegions.add(region);
|
||||
}
|
||||
return moved;
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Move Regions without Acknowledging.Usefule in case of RS shutdown as we might want to shut the
|
||||
* RS down anyways and not abort on a stuck region. Improves movement performance
|
||||
*/
|
||||
private class MoveWithoutAck implements Callable<Boolean> {
|
||||
private Admin admin;
|
||||
private HRegionInfo region;
|
||||
private String targetServer;
|
||||
private List<HRegionInfo> movedRegions;
|
||||
private String sourceServer;
|
||||
|
||||
public MoveWithoutAck(Admin admin, HRegionInfo regionInfo, String sourceServer,
|
||||
String targetServer, List<HRegionInfo> movedRegions) {
|
||||
this.admin = admin;
|
||||
this.region = regionInfo;
|
||||
this.targetServer = targetServer;
|
||||
this.movedRegions = movedRegions;
|
||||
this.sourceServer = sourceServer;
|
||||
}
|
||||
|
||||
@Override
|
||||
public Boolean call() {
|
||||
try {
|
||||
LOG.info("Moving region:" + region.getEncodedName() + "from " + sourceServer + " to "
|
||||
+ targetServer);
|
||||
admin.move(region.getEncodedNameAsBytes(), Bytes.toBytes(targetServer));
|
||||
LOG.info("Moved " + region.getEncodedName() + " from " + sourceServer + " to "
|
||||
+ targetServer);
|
||||
} catch (Exception e) {
|
||||
LOG.error("Error Moving Region:" + region.getEncodedName(), e);
|
||||
} finally {
|
||||
// we add region to the moved regions list in No Ack Mode since this is best effort
|
||||
movedRegions.add(region);
|
||||
}
|
||||
return true;
|
||||
}
|
||||
}
|
||||
|
||||
private List<HRegionInfo> readRegionsFromFile(String filename) throws IOException {
|
||||
List<HRegionInfo> regions = new ArrayList<HRegionInfo>();
|
||||
File f = new File(filename);
|
||||
if (!f.exists()) {
|
||||
return regions;
|
||||
}
|
||||
FileInputStream fis = null;
|
||||
DataInputStream dis = null;
|
||||
try {
|
||||
fis = new FileInputStream(f);
|
||||
dis = new DataInputStream(fis);
|
||||
int numRegions = dis.readInt();
|
||||
int index = 0;
|
||||
while (index < numRegions) {
|
||||
regions.add(HRegionInfo.parseFromOrNull(Bytes.readByteArray(dis)));
|
||||
index++;
|
||||
}
|
||||
} catch (IOException e) {
|
||||
LOG.error("Error while reading regions from file:" + filename, e);
|
||||
throw e;
|
||||
} finally {
|
||||
if (dis != null) {
|
||||
dis.close();
|
||||
}
|
||||
if (fis != null) {
|
||||
fis.close();
|
||||
}
|
||||
}
|
||||
return regions;
|
||||
}
|
||||
|
||||
/**
|
||||
* Get online regions of the passed server
|
||||
* @param conf
|
||||
* @param server
|
||||
* @return List of Regions online on the server
|
||||
* @throws IOException
|
||||
*/
|
||||
private List<HRegionInfo> getRegions(Configuration conf, String server) throws IOException {
|
||||
Connection conn = ConnectionFactory.createConnection(conf);
|
||||
try {
|
||||
return conn.getAdmin().getOnlineRegions(ServerName.valueOf(server));
|
||||
} finally {
|
||||
conn.close();
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Write the number of regions moved in the first line followed by regions moved in subsequent
|
||||
* lines
|
||||
* @param filename
|
||||
* @param movedRegions
|
||||
* @throws IOException
|
||||
*/
|
||||
private void writeFile(String filename, List<HRegionInfo> movedRegions) throws IOException {
|
||||
FileOutputStream fos = null;
|
||||
DataOutputStream dos = null;
|
||||
try {
|
||||
fos = new FileOutputStream(filename);
|
||||
dos = new DataOutputStream(fos);
|
||||
dos.writeInt(movedRegions.size());
|
||||
for (HRegionInfo region : movedRegions) {
|
||||
Bytes.writeByteArray(dos, region.toByteArray());
|
||||
}
|
||||
} catch (IOException e) {
|
||||
LOG.error("ERROR: Was Not able to write regions moved to output file but moved "
|
||||
+ movedRegions.size() + " regions", e);
|
||||
throw e;
|
||||
} finally {
|
||||
if (dos != null) {
|
||||
dos.close();
|
||||
}
|
||||
if (fos != null) {
|
||||
fos.close();
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Excludes the servername whose hostname and port portion matches the list given in exclude file
|
||||
* @param regionServers
|
||||
* @param excludeFile
|
||||
* @throws IOException
|
||||
*/
|
||||
private void stripExcludes(ArrayList<String> regionServers, String excludeFile)
|
||||
throws IOException {
|
||||
if (excludeFile != null) {
|
||||
ArrayList<String> excludes = readExcludes(excludeFile);
|
||||
Iterator<String> i = regionServers.iterator();
|
||||
while (i.hasNext()) {
|
||||
String rs = i.next();
|
||||
String rsPort =
|
||||
rs.split(ServerName.SERVERNAME_SEPARATOR)[0] + ":"
|
||||
+ rs.split(ServerName.SERVERNAME_SEPARATOR)[1];
|
||||
if (excludes.contains(rsPort)) {
|
||||
i.remove();
|
||||
}
|
||||
}
|
||||
LOG.info("Valid Region server targets are:" + regionServers.toString());
|
||||
LOG.info("Excluded Servers are" + excludes.toString());
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Exclude master from list of RSs to move regions to
|
||||
* @param regionServers
|
||||
* @param admin
|
||||
* @throws Exception
|
||||
*/
|
||||
private void stripMaster(ArrayList<String> regionServers, Admin admin) throws Exception {
|
||||
stripServer(regionServers, admin.getClusterStatus().getMaster().getHostname(),
|
||||
admin.getClusterStatus().getMaster().getPort());
|
||||
}
|
||||
|
||||
/**
|
||||
* Create an Arraylst of servers listed in exclude file
|
||||
* @param excludeFile
|
||||
* @return ArrayList of servers to be excluded in format <hostname:port>
|
||||
* @throws IOException
|
||||
*/
|
||||
private ArrayList<String> readExcludes(String excludeFile) throws IOException {
|
||||
ArrayList<String> excludeServers = new ArrayList<String>();
|
||||
if (excludeFile == null) {
|
||||
return excludeServers;
|
||||
} else {
|
||||
File f = new File(excludeFile);
|
||||
String line;
|
||||
BufferedReader br = null;
|
||||
try {
|
||||
br = new BufferedReader(new FileReader(f));
|
||||
while ((line = br.readLine()) != null) {
|
||||
line.trim();
|
||||
if (!line.equals("")) {
|
||||
excludeServers.add(line);
|
||||
}
|
||||
}
|
||||
} catch (IOException e) {
|
||||
LOG.warn("Exception while reading excludes file,continuing anyways", e);
|
||||
} finally {
|
||||
if (br != null) {
|
||||
br.close();
|
||||
}
|
||||
}
|
||||
return excludeServers;
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Remove the servername whose hostname and port portion matches from the passed array of servers.
|
||||
* Returns as side-effect the servername removed.
|
||||
* @param regionServers
|
||||
* @param hostname
|
||||
* @param port
|
||||
* @return server removed from list of Region Servers
|
||||
* @throws Exception
|
||||
*/
|
||||
private String stripServer(ArrayList<String> regionServers, String hostname, int port)
|
||||
throws Exception {
|
||||
String server = null;
|
||||
String portString = Integer.toString(port);
|
||||
Iterator<String> i = regionServers.iterator();
|
||||
int noOfRs = regionServers.size();
|
||||
while (i.hasNext()) {
|
||||
server = i.next();
|
||||
String[] splitServer = server.split(ServerName.SERVERNAME_SEPARATOR);
|
||||
if (splitServer[0].equals(hostname) && splitServer[1].equals(portString)) {
|
||||
i.remove();
|
||||
return server;
|
||||
}
|
||||
}
|
||||
if (regionServers.size() >= noOfRs) {
|
||||
throw new Exception("Server " + hostname + ":" + Integer.toString(port)
|
||||
+ " is not in list of online servers(Offline/Incorrect)");
|
||||
}
|
||||
return server;
|
||||
}
|
||||
|
||||
/**
|
||||
* Get Arraylist of Servers in the cluster
|
||||
* @param admin
|
||||
* @return ArrayList of online region servers
|
||||
* @throws IOException
|
||||
*/
|
||||
private ArrayList<String> getServers(Admin admin) throws IOException {
|
||||
ArrayList<ServerName> serverInfo =
|
||||
new ArrayList<ServerName>(admin.getClusterStatus().getServers());
|
||||
ArrayList<String> regionServers = new ArrayList<String>();
|
||||
for (ServerName server : serverInfo) {
|
||||
regionServers.add(server.getServerName());
|
||||
}
|
||||
return regionServers;
|
||||
}
|
||||
|
||||
private void deleteFile(String filename) {
|
||||
File f = new File(filename);
|
||||
if (f.exists()) {
|
||||
f.delete();
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Tries to scan a row from passed region
|
||||
* @param admin
|
||||
* @param region
|
||||
* @throws IOException
|
||||
*/
|
||||
private void isSuccessfulScan(Admin admin, HRegionInfo region) throws IOException {
|
||||
Scan scan = new Scan(region.getStartKey());
|
||||
scan.setBatch(1);
|
||||
scan.setCaching(1);
|
||||
scan.setFilter(new FirstKeyOnlyFilter());
|
||||
try {
|
||||
Table table = admin.getConnection().getTable(region.getTable());
|
||||
try {
|
||||
ResultScanner scanner = table.getScanner(scan);
|
||||
try {
|
||||
scanner.next();
|
||||
} finally {
|
||||
scanner.close();
|
||||
}
|
||||
} finally {
|
||||
table.close();
|
||||
}
|
||||
} catch (IOException e) {
|
||||
LOG.error("Could not scan region:" + region.getEncodedName(), e);
|
||||
throw e;
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Returns true if passed region is still on serverName when we look at hbase:meta.
|
||||
* @param admin
|
||||
* @param region
|
||||
* @param serverName
|
||||
* @return true if region is hosted on serverName otherwise false
|
||||
* @throws IOException
|
||||
*/
|
||||
private boolean isSameServer(Admin admin, HRegionInfo region, String serverName)
|
||||
throws IOException {
|
||||
String serverForRegion = getServerNameForRegion(admin, region);
|
||||
if (serverForRegion != null && serverForRegion.equals(serverName)) {
|
||||
return true;
|
||||
}
|
||||
return false;
|
||||
}
|
||||
|
||||
/**
|
||||
* Get servername that is up in hbase:meta hosting the given region. this is hostname + port +
|
||||
* startcode comma-delimited. Can return null
|
||||
* @param admin
|
||||
* @param region
|
||||
* @return regionServer hosting the given region
|
||||
* @throws IOException
|
||||
*/
|
||||
private String getServerNameForRegion(Admin admin, HRegionInfo region) throws IOException {
|
||||
String server = null;
|
||||
if (!admin.isTableEnabled(region.getTable())) {
|
||||
return null;
|
||||
}
|
||||
if (region.isMetaRegion()) {
|
||||
ZooKeeperWatcher zkw = new ZooKeeperWatcher(admin.getConfiguration(), "region_mover", null);
|
||||
MetaTableLocator locator = new MetaTableLocator();
|
||||
int maxWaitInSeconds =
|
||||
admin.getConfiguration().getInt(MOVE_WAIT_MAX_KEY, DEFAULT_MOVE_WAIT_MAX);
|
||||
try {
|
||||
server = locator.waitMetaRegionLocation(zkw, maxWaitInSeconds * 1000).toString() + ",";
|
||||
} catch (InterruptedException e) {
|
||||
LOG.error("Interrupted while waiting for location of Meta", e);
|
||||
} finally {
|
||||
if (zkw != null) {
|
||||
zkw.close();
|
||||
}
|
||||
}
|
||||
} else {
|
||||
Table table = admin.getConnection().getTable(TableName.META_TABLE_NAME);
|
||||
try {
|
||||
Get get = new Get(region.getRegionName());
|
||||
get.addColumn(HConstants.CATALOG_FAMILY, HConstants.SERVER_QUALIFIER);
|
||||
get.addColumn(HConstants.CATALOG_FAMILY, HConstants.STARTCODE_QUALIFIER);
|
||||
Result result = table.get(get);
|
||||
if (result != null) {
|
||||
byte[] servername =
|
||||
result.getValue(HConstants.CATALOG_FAMILY, HConstants.SERVER_QUALIFIER);
|
||||
byte[] startcode =
|
||||
result.getValue(HConstants.CATALOG_FAMILY, HConstants.STARTCODE_QUALIFIER);
|
||||
if (servername != null) {
|
||||
server =
|
||||
Bytes.toString(servername).replaceFirst(":", ",") + "," + Bytes.toLong(startcode);
|
||||
}
|
||||
}
|
||||
} catch (IOException e) {
|
||||
LOG.error("Could not get Server Name for region:" + region.getEncodedName(), e);
|
||||
throw e;
|
||||
} finally {
|
||||
table.close();
|
||||
}
|
||||
}
|
||||
return server;
|
||||
}
|
||||
|
||||
@Override
|
||||
protected void addOptions() {
|
||||
this.addRequiredOptWithArg("r", "regionserverhost", "region server <hostname>|<hostname:port>");
|
||||
this.addRequiredOptWithArg("l", "Expected: load/unload");
|
||||
this.addOptWithArg("m", "maxthreads",
|
||||
"Define the maximum number of threads to use to unload and reload the regions");
|
||||
this.addOptWithArg("x", "excludefile",
|
||||
"File with <hostname:port> per line to exclude as unload targets; default excludes only "
|
||||
+ "target host; useful for rack decommisioning.");
|
||||
this.addOptWithArg("f", "filename",
|
||||
"File to save regions list into unloading, or read from loading; "
|
||||
+ "default /tmp/<usernamehostname:port>");
|
||||
this.addOptNoArg("n", "noAck",
|
||||
"Enable Ack mode(default: true) which checks if region is online on target RegionServer -- "
|
||||
+ "Upon disabling,in case a region is stuck, it'll move on anyways");
|
||||
this.addOptWithArg("t", "timeout", "timeout in seconds after which the tool will exit "
|
||||
+ "irrespective of whether it finished or not;default Integer.MAX_VALUE");
|
||||
}
|
||||
|
||||
@Override
|
||||
protected void processOptions(CommandLine cmd) {
|
||||
String hostname = cmd.getOptionValue("r");
|
||||
rmbuilder = new RegionMoverBuilder(hostname);
|
||||
if (cmd.hasOption('m')) {
|
||||
rmbuilder.maxthreads(Integer.parseInt(cmd.getOptionValue('m')));
|
||||
}
|
||||
if (cmd.hasOption('n')) {
|
||||
rmbuilder.ack(false);
|
||||
}
|
||||
if (cmd.hasOption('f')) {
|
||||
rmbuilder.filename(cmd.getOptionValue('f'));
|
||||
}
|
||||
if (cmd.hasOption('x')) {
|
||||
rmbuilder.excludeFile(cmd.getOptionValue('x'));
|
||||
}
|
||||
if (cmd.hasOption('t')) {
|
||||
rmbuilder.timeout(Integer.parseInt(cmd.getOptionValue('t')));
|
||||
}
|
||||
this.loadUnload = cmd.getOptionValue("l").toLowerCase();
|
||||
}
|
||||
|
||||
@Override
|
||||
protected int doWork() throws Exception {
|
||||
RegionMover rm = rmbuilder.build();
|
||||
if (loadUnload.equalsIgnoreCase("load")) {
|
||||
rm.load();
|
||||
} else if (loadUnload.equalsIgnoreCase("unload")) {
|
||||
rm.unload();
|
||||
} else {
|
||||
printUsage();
|
||||
System.exit(1);
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
public static void main(String[] args) {
|
||||
new RegionMover().doStaticMain(args);
|
||||
}
|
||||
}
|
||||
|
|
@ -0,0 +1,200 @@
|
|||
/**
|
||||
*
|
||||
* 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.util;
|
||||
|
||||
import static org.junit.Assert.assertEquals;
|
||||
|
||||
import java.io.FileWriter;
|
||||
|
||||
import org.apache.commons.logging.Log;
|
||||
import org.apache.commons.logging.LogFactory;
|
||||
import org.apache.hadoop.hbase.HBaseTestingUtility;
|
||||
import org.apache.hadoop.hbase.HTableDescriptor;
|
||||
import org.apache.hadoop.hbase.MiniHBaseCluster;
|
||||
import org.apache.hadoop.hbase.TableName;
|
||||
import org.apache.hadoop.hbase.Waiter.Predicate;
|
||||
import org.apache.hadoop.hbase.client.Admin;
|
||||
import org.apache.hadoop.hbase.regionserver.HRegionServer;
|
||||
import org.apache.hadoop.hbase.testclassification.MediumTests;
|
||||
import org.apache.hadoop.hbase.util.RegionMover.RegionMoverBuilder;
|
||||
import org.junit.AfterClass;
|
||||
import org.junit.Before;
|
||||
import org.junit.BeforeClass;
|
||||
import org.junit.Test;
|
||||
import org.junit.experimental.categories.Category;
|
||||
|
||||
/**
|
||||
* Tests for Region Mover Load/Unload functionality with and without ack mode and also to test
|
||||
* exclude functionality useful for rack decommissioning
|
||||
*/
|
||||
@Category(MediumTests.class)
|
||||
public class TestRegionMover {
|
||||
|
||||
final Log LOG = LogFactory.getLog(getClass());
|
||||
protected final static HBaseTestingUtility TEST_UTIL = new HBaseTestingUtility();
|
||||
|
||||
@BeforeClass
|
||||
public static void setUpBeforeClass() throws Exception {
|
||||
TEST_UTIL.startMiniCluster(3);
|
||||
}
|
||||
|
||||
@AfterClass
|
||||
public static void tearDownAfterClass() throws Exception {
|
||||
TEST_UTIL.shutdownMiniCluster();
|
||||
}
|
||||
|
||||
@Before
|
||||
public void setUp() throws Exception {
|
||||
// Create a pre-split table just to populate some regions
|
||||
TableName tableName = TableName.valueOf("testRegionMover");
|
||||
Admin admin = TEST_UTIL.getHBaseAdmin();
|
||||
if (admin.tableExists(tableName)) {
|
||||
TEST_UTIL.deleteTable(tableName);
|
||||
}
|
||||
HTableDescriptor tableDesc = new HTableDescriptor(tableName);
|
||||
try {
|
||||
admin.setBalancerRunning(false, true);
|
||||
String startKey = "a";
|
||||
String endKey = "z";
|
||||
admin.createTable(tableDesc, startKey.getBytes(), endKey.getBytes(), 9);
|
||||
} finally {
|
||||
if (admin != null) {
|
||||
admin.close();
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
@Test
|
||||
public void testLoadWithAck() throws Exception {
|
||||
MiniHBaseCluster cluster = TEST_UTIL.getHBaseCluster();
|
||||
HRegionServer regionServer = cluster.getRegionServer(0);
|
||||
String rsName = regionServer.getServerName().getHostname();
|
||||
int port = regionServer.getServerName().getPort();
|
||||
int noRegions = regionServer.getNumberOfOnlineRegions();
|
||||
String rs = rsName + ":" + Integer.toString(port);
|
||||
RegionMoverBuilder rmBuilder = new RegionMoverBuilder(rs).ack(true).maxthreads(8);
|
||||
RegionMover rm = rmBuilder.build();
|
||||
rm.setConf(TEST_UTIL.getConfiguration());
|
||||
LOG.info("Unloading " + rs);
|
||||
rm.unload();
|
||||
assertEquals(0, regionServer.getNumberOfOnlineRegions());
|
||||
LOG.info("Successfully Unloaded\nNow Loading");
|
||||
rm.load();
|
||||
assertEquals(noRegions, regionServer.getNumberOfOnlineRegions());
|
||||
}
|
||||
|
||||
/** Test to unload a regionserver first and then load it using no Ack mode
|
||||
* we check if some regions are loaded on the region server(since no ack is best effort)
|
||||
* @throws Exception
|
||||
*/
|
||||
@Test
|
||||
public void testLoadWithoutAck() throws Exception {
|
||||
MiniHBaseCluster cluster = TEST_UTIL.getHBaseCluster();
|
||||
final HRegionServer regionServer = cluster.getRegionServer(0);
|
||||
String rsName = regionServer.getServerName().getHostname();
|
||||
int port = regionServer.getServerName().getPort();
|
||||
int noRegions = regionServer.getNumberOfOnlineRegions();
|
||||
String rs = rsName + ":" + Integer.toString(port);
|
||||
RegionMoverBuilder rmBuilder = new RegionMoverBuilder(rs).ack(true);
|
||||
RegionMover rm = rmBuilder.build();
|
||||
rm.setConf(TEST_UTIL.getConfiguration());
|
||||
LOG.info("Unloading " + rs);
|
||||
rm.unload();
|
||||
assertEquals(0, regionServer.getNumberOfOnlineRegions());
|
||||
LOG.info("Successfully Unloaded\nNow Loading");
|
||||
rm = rmBuilder.ack(false).build();
|
||||
rm.setConf(TEST_UTIL.getConfiguration());
|
||||
rm.load();
|
||||
TEST_UTIL.waitFor(5000, 500, new Predicate<Exception>() {
|
||||
@Override
|
||||
public boolean evaluate() throws Exception {
|
||||
return regionServer.getNumberOfOnlineRegions() > 0;
|
||||
}
|
||||
});
|
||||
}
|
||||
|
||||
@Test
|
||||
public void testUnloadWithoutAck() throws Exception {
|
||||
MiniHBaseCluster cluster = TEST_UTIL.getHBaseCluster();
|
||||
final HRegionServer regionServer = cluster.getRegionServer(0);
|
||||
final int noRegions = regionServer.getNumberOfOnlineRegions();
|
||||
String rsName = regionServer.getServerName().getHostname();
|
||||
int port = regionServer.getServerName().getPort();
|
||||
String rs = rsName + ":" + Integer.toString(port);
|
||||
RegionMoverBuilder rmBuilder = new RegionMoverBuilder(rs).ack(false);
|
||||
RegionMover rm = rmBuilder.build();
|
||||
rm.setConf(TEST_UTIL.getConfiguration());
|
||||
LOG.info("Unloading " + rs);
|
||||
rm.unload();
|
||||
TEST_UTIL.waitFor(5000, 500, new Predicate<Exception>() {
|
||||
@Override
|
||||
public boolean evaluate() throws Exception {
|
||||
return regionServer.getNumberOfOnlineRegions() < noRegions;
|
||||
}
|
||||
});
|
||||
}
|
||||
|
||||
@Test
|
||||
public void testUnloadWithAck() throws Exception {
|
||||
MiniHBaseCluster cluster = TEST_UTIL.getHBaseCluster();
|
||||
HRegionServer regionServer = cluster.getRegionServer(0);
|
||||
String rsName = regionServer.getServerName().getHostname();
|
||||
int port = regionServer.getServerName().getPort();
|
||||
String rs = rsName + ":" + Integer.toString(port);
|
||||
RegionMoverBuilder rmBuilder = new RegionMoverBuilder(rs).ack(true);
|
||||
RegionMover rm = rmBuilder.build();
|
||||
rm.setConf(TEST_UTIL.getConfiguration());
|
||||
rm.unload();
|
||||
LOG.info("Unloading " + rs);
|
||||
assertEquals(0, regionServer.getNumberOfOnlineRegions());
|
||||
}
|
||||
|
||||
/**
|
||||
* To test that we successfully exclude a server from the unloading process We test for the number
|
||||
* of regions on Excluded server and also test that regions are unloaded successfully
|
||||
* @throws Exception
|
||||
*/
|
||||
@Test
|
||||
public void testExclude() throws Exception {
|
||||
MiniHBaseCluster cluster = TEST_UTIL.getHBaseCluster();
|
||||
FileWriter fos = new FileWriter("/tmp/exclude_file");
|
||||
HRegionServer excludeServer = cluster.getRegionServer(1);
|
||||
String excludeHostname = excludeServer.getServerName().getHostname();
|
||||
int excludeServerPort = excludeServer.getServerName().getPort();
|
||||
int regionsExcludeServer = excludeServer.getNumberOfOnlineRegions();
|
||||
String excludeServerName = excludeHostname + ":" + Integer.toString(excludeServerPort);
|
||||
fos.write(excludeServerName);
|
||||
fos.close();
|
||||
HRegionServer regionServer = cluster.getRegionServer(0);
|
||||
String rsName = regionServer.getServerName().getHostname();
|
||||
int port = regionServer.getServerName().getPort();
|
||||
String rs = rsName + ":" + Integer.toString(port);
|
||||
RegionMoverBuilder rmBuilder =
|
||||
new RegionMoverBuilder(rs).ack(true).excludeFile("/tmp/exclude_file");
|
||||
RegionMover rm = rmBuilder.build();
|
||||
rm.setConf(TEST_UTIL.getConfiguration());
|
||||
rm.unload();
|
||||
LOG.info("Unloading " + rs);
|
||||
assertEquals(0, regionServer.getNumberOfOnlineRegions());
|
||||
assertEquals(regionsExcludeServer, cluster.getRegionServer(1).getNumberOfOnlineRegions());
|
||||
LOG.info("Before:" + regionsExcludeServer + " After:"
|
||||
+ cluster.getRegionServer(1).getNumberOfOnlineRegions());
|
||||
}
|
||||
}
|
||||
Loading…
Reference in New Issue