org.apache.hadoop.hdfs.server.diskbalancer.command.ExecuteCommand Maven / Gradle / Ivy
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* to you under the Apache License, Version 2.0 (the
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*
* http://www.apache.org/licenses/LICENSE-2.0
*
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package org.apache.hadoop.hdfs.server.diskbalancer.command;
import com.google.common.base.Preconditions;
import org.apache.commons.cli.CommandLine;
import org.apache.commons.cli.HelpFormatter;
import org.apache.commons.codec.digest.DigestUtils;
import org.apache.commons.io.IOUtils;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FSDataInputStream;
import org.apache.hadoop.hdfs.protocol.ClientDatanodeProtocol;
import org.apache.hadoop.hdfs.server.diskbalancer.DiskBalancerException;
import org.apache.hadoop.hdfs.server.diskbalancer.planner.NodePlan;
import org.apache.hadoop.hdfs.tools.DiskBalancerCLI;
import java.io.IOException;
/**
* executes a given plan.
*/
public class ExecuteCommand extends Command {
/**
* Constructs ExecuteCommand.
*
* @param conf - Configuration.
*/
public ExecuteCommand(Configuration conf) {
super(conf);
addValidCommandParameters(DiskBalancerCLI.EXECUTE,
"Executes a given plan.");
addValidCommandParameters(DiskBalancerCLI.SKIPDATECHECK,
"skips the date check and force execute the plan");
}
/**
* Executes the Client Calls.
*
* @param cmd - CommandLine
*/
@Override
public void execute(CommandLine cmd) throws Exception {
LOG.info("Executing \"execute plan\" command");
Preconditions.checkState(cmd.hasOption(DiskBalancerCLI.EXECUTE));
verifyCommandOptions(DiskBalancerCLI.EXECUTE, cmd);
String planFile = cmd.getOptionValue(DiskBalancerCLI.EXECUTE);
Preconditions.checkArgument(planFile != null && !planFile.isEmpty(),
"Invalid plan file specified.");
String planData = null;
try (FSDataInputStream plan = open(planFile)) {
planData = IOUtils.toString(plan);
}
boolean skipDateCheck = false;
if(cmd.hasOption(DiskBalancerCLI.SKIPDATECHECK)) {
skipDateCheck = true;
LOG.warn("Skipping date check on this plan. This could mean we are " +
"executing an old plan and may not be the right plan for this " +
"data node.");
}
submitPlan(planFile, planData, skipDateCheck);
}
/**
* Submits plan to a given data node.
*
* @param planFile - Plan file name
* @param planData - Plan data in json format
* @param skipDateCheck - skips date check
* @throws IOException
*/
private void submitPlan(final String planFile, final String planData,
boolean skipDateCheck)
throws IOException {
Preconditions.checkNotNull(planData);
NodePlan plan = NodePlan.parseJson(planData);
String dataNodeAddress = plan.getNodeName() + ":" + plan.getPort();
Preconditions.checkNotNull(dataNodeAddress);
ClientDatanodeProtocol dataNode = getDataNodeProxy(dataNodeAddress);
String planHash = DigestUtils.shaHex(planData);
try {
dataNode.submitDiskBalancerPlan(planHash, DiskBalancerCLI.PLAN_VERSION,
planFile, planData, skipDateCheck);
} catch (DiskBalancerException ex) {
LOG.error("Submitting plan on {} failed. Result: {}, Message: {}",
plan.getNodeName(), ex.getResult().toString(), ex.getMessage());
throw ex;
}
}
/**
* Gets extended help for this command.
*/
@Override
public void printHelp() {
String header = "Execute command runs a submits a plan for execution on " +
"the given data node.\n\n";
String footer = "\nExecute command submits the job to data node and " +
"returns immediately. The state of job can be monitored via query " +
"command. ";
HelpFormatter helpFormatter = new HelpFormatter();
helpFormatter.printHelp("hdfs diskbalancer -execute ",
header, DiskBalancerCLI.getExecuteOptions(), footer);
}
}