Brock Noland created MAPREDUCE-5001:
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Summary: LocalJobRunner has race condition resulting in job
failures
Key: MAPREDUCE-5001
URL: https://issues.apache.org/jira/browse/MAPREDUCE-5001
Project: Hadoop Map/Reduce
Issue Type: Bug
Affects Versions: 2.0.2-alpha
Reporter: Brock Noland
Hive is hitting a race condition with LocalJobRunner and the Cluster class. The
JobClient uses the Cluster class to obtain Job objects. The Cluster class uses
the job.xml file to populate the JobConf object
(https://github.com/apache/hadoop-common/blob/trunk/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/java/org/apache/hadoop/mapreduce/Cluster.java#L184).
However, this file is deleted by the LocalJobRunner at the end of it's job
(https://github.com/apache/hadoop-common/blob/trunk/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-common/src/main/java/org/apache/hadoop/mapred/LocalJobRunner.java#L484).
This results in the following exception:
{noformat}
2013-02-11 14:45:17,755 (main) [FATAL -
org.apache.hadoop.conf.Configuration.loadResource(Configuration.java:2001)]
error parsing conf
file:/tmp/hadoop-brock/mapred/staging/brock1916441210/.staging/job_local_0432/job.xml
java.io.FileNotFoundException:
/tmp/hadoop-brock/mapred/staging/brock1916441210/.staging/job_local_0432/job.xml
(No such file or directory)
at java.io.FileInputStream.open(Native Method)
at java.io.FileInputStream.<init>(FileInputStream.java:120)
at
org.apache.hadoop.conf.Configuration.loadResource(Configuration.java:1917)
at
org.apache.hadoop.conf.Configuration.loadResources(Configuration.java:1870)
at
org.apache.hadoop.conf.Configuration.getProps(Configuration.java:1777)
at org.apache.hadoop.conf.Configuration.get(Configuration.java:712)
at
org.apache.hadoop.mapred.JobConf.checkAndWarnDeprecation(JobConf.java:1951)
at org.apache.hadoop.mapred.JobConf.<init>(JobConf.java:398)
at org.apache.hadoop.mapred.JobConf.<init>(JobConf.java:388)
at
org.apache.hadoop.mapred.JobClient$NetworkedJob.<init>(JobClient.java:174)
at org.apache.hadoop.mapred.JobClient.getJob(JobClient.java:655)
at org.apache.hadoop.mapred.JobClient.getJob(JobClient.java:668)
at
org.apache.hadoop.mapreduce.TestMR2LocalMode.test(TestMR2LocalMode.java:40)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at
org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:45)
at
org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
at
org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:42)
at
org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20)
at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:263)
at
org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:68)
at
org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:47)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:231)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:60)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:229)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:50)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:222)
at org.junit.runners.ParentRunner.run(ParentRunner.java:300)
at
org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)
at
org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
at
org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
at
org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
at
org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
at
org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)
{noformat}
Here is code which exposes this race fairly quickly:
{noformat}
Configuration conf = new Configuration();
conf.set("mapreduce.framework.name", "local");
conf.set("mapreduce.jobtracker.address", "local");
File inputDir = new File("/tmp", "input-" + System.currentTimeMillis());
File outputDir = new File("/tmp", "output-" + System.currentTimeMillis());
while(true) {
Assert.assertTrue(inputDir.mkdirs());
File inputFile = new File(inputDir, "file");
FileUtils.copyFile(new File("/etc/passwd"), inputFile);
Path input = new Path(inputDir.getAbsolutePath());
Path output = new Path(outputDir.getAbsolutePath());
JobConf jobConf = new JobConf(conf, TestMR2LocalMode.class);
FileInputFormat.addInputPath(jobConf, input);
FileOutputFormat.setOutputPath(jobConf, output);
JobClient jobClient = new JobClient(conf);
RunningJob runningJob = jobClient.submitJob(jobConf);
while(!runningJob.isComplete()) {
runningJob = jobClient.getJob(runningJob.getJobID());
}
FileUtils.deleteQuietly(inputDir);
FileUtils.deleteQuietly(outputDir);
}
{noformat}
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