Ahmed Hussein created MAPREDUCE-7325:
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Summary: Intermediate data encryption is broken in LocalJobRunner
Key: MAPREDUCE-7325
URL: https://issues.apache.org/jira/browse/MAPREDUCE-7325
Project: Hadoop Map/Reduce
Issue Type: Bug
Components: job submission, security
Reporter: Ahmed Hussein
With enabling intermediate encryption, running a job using LocalJobRunner with
multiple reducers fails with the following error:
{code:bash}
2021-02-23 18:18:05,145 WARN [Thread-2381] mapred.LocalJobRunner
(LocalJobRunner.java:run(590)) - job_local1344328673_0004
java.lang.Exception:
org.apache.hadoop.mapreduce.task.reduce.Shuffle$ShuffleError: error in shuffle
in localfetcher#5
at
org.apache.hadoop.mapred.LocalJobRunner$Job.runTasks(LocalJobRunner.java:492)
at
org.apache.hadoop.mapred.LocalJobRunner$Job.run(LocalJobRunner.java:559)
Caused by: org.apache.hadoop.mapreduce.task.reduce.Shuffle$ShuffleError: error
in shuffle in localfetcher#5
at org.apache.hadoop.mapreduce.task.reduce.Shuffle.run(Shuffle.java:136)
at org.apache.hadoop.mapred.ReduceTask.run(ReduceTask.java:377)
at
org.apache.hadoop.mapred.LocalJobRunner$Job$ReduceTaskRunnable.run(LocalJobRunner.java:347)
at
java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
Caused by: org.apache.hadoop.fs.ChecksumException: Checksum Error
at
org.apache.hadoop.mapred.IFileInputStream.doRead(IFileInputStream.java:229)
at
org.apache.hadoop.mapred.IFileInputStream.read(IFileInputStream.java:153)
at org.apache.hadoop.io.IOUtils.readFully(IOUtils.java:210)
at
org.apache.hadoop.mapreduce.task.reduce.InMemoryMapOutput.doShuffle(InMemoryMapOutput.java:91)
at
org.apache.hadoop.mapreduce.task.reduce.IFileWrappedMapOutput.shuffle(IFileWrappedMapOutput.java:63)
at
org.apache.hadoop.mapreduce.task.reduce.LocalFetcher.copyMapOutput(LocalFetcher.java:156)
at
org.apache.hadoop.mapreduce.task.reduce.LocalFetcher.doCopy(LocalFetcher.java:103)
at
org.apache.hadoop.mapreduce.task.reduce.LocalFetcher.run(LocalFetcher.java:86)
{code}
The bug can be reproduced with any test unit like TestLocalJobSubmission.
Another way to reproduce the bug is to run {{LargeSorter}} with multiple
reducers.
{code:java}
Configuration config = new Configuration();
// set all the necessary configurations
config.setInt(LargeSorter.NUM_REDUCE_TASKS,2);
String[] args = new String[] {"output-dir"};
int res = ToolRunner.run(config, new LargeSorter(), args);
{code}
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