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https://issues.apache.org/jira/browse/HADOOP-12033?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14592381#comment-14592381
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zhihai xu commented on HADOOP-12033:
------------------------------------
thanks [~jhalfpenny] for the patch, It looks like the issue is fixed at
HADOOP-8151 at trunk but HADOOP-8151 is not merged into branch-2:
https://github.com/apache/hadoop/blob/branch-2/hadoop-common-project/hadoop-common/src/main/native/src/org/apache/hadoop/io/compress/snappy/SnappyDecompressor.c#L121
Hi [~ivanmi], Did the branch you use have the fix for HADOOP-8151?
Hi [~vinodkv], It looks like HADOOP-8151 is also not merged into branch-2.7.0.
Can we add HADOOP-8151 to 2.7.1 release?
thanks
> Reducer task failure with java.lang.NoClassDefFoundError:
> Ljava/lang/InternalError at
> org.apache.hadoop.io.compress.snappy.SnappyDecompressor.decompressBytesDirect
> -------------------------------------------------------------------------------------------------------------------------------------------------------------------
>
> Key: HADOOP-12033
> URL: https://issues.apache.org/jira/browse/HADOOP-12033
> Project: Hadoop Common
> Issue Type: Bug
> Reporter: Ivan Mitic
> Attachments: 0001-HADOOP-12033.patch
>
>
> We have noticed intermittent reducer task failures with the below exception:
> {code}
> Error: org.apache.hadoop.mapreduce.task.reduce.Shuffle$ShuffleError: error in
> shuffle in fetcher#9 at
> org.apache.hadoop.mapreduce.task.reduce.Shuffle.run(Shuffle.java:134) at
> org.apache.hadoop.mapred.ReduceTask.run(ReduceTask.java:376) at
> org.apache.hadoop.mapred.YarnChild$2.run(YarnChild.java:163) at
> java.security.AccessController.doPrivileged(Native Method) at
> javax.security.auth.Subject.doAs(Subject.java:415) at
> org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1628)
> at org.apache.hadoop.mapred.YarnChild.main(YarnChild.java:158) Caused by:
> java.lang.NoClassDefFoundError: Ljava/lang/InternalError at
> org.apache.hadoop.io.compress.snappy.SnappyDecompressor.decompressBytesDirect(Native
> Method) at
> org.apache.hadoop.io.compress.snappy.SnappyDecompressor.decompress(SnappyDecompressor.java:239)
> at
> org.apache.hadoop.io.compress.BlockDecompressorStream.decompress(BlockDecompressorStream.java:88)
> at
> org.apache.hadoop.io.compress.DecompressorStream.read(DecompressorStream.java:85)
> at org.apache.hadoop.io.IOUtils.readFully(IOUtils.java:192) at
> org.apache.hadoop.mapreduce.task.reduce.InMemoryMapOutput.shuffle(InMemoryMapOutput.java:97)
> at
> org.apache.hadoop.mapreduce.task.reduce.Fetcher.copyMapOutput(Fetcher.java:534)
> at
> org.apache.hadoop.mapreduce.task.reduce.Fetcher.copyFromHost(Fetcher.java:329)
> at org.apache.hadoop.mapreduce.task.reduce.Fetcher.run(Fetcher.java:193)
> Caused by: java.lang.ClassNotFoundException: Ljava.lang.InternalError at
> java.net.URLClassLoader$1.run(URLClassLoader.java:366) at
> java.net.URLClassLoader$1.run(URLClassLoader.java:355) at
> java.security.AccessController.doPrivileged(Native Method) at
> java.net.URLClassLoader.findClass(URLClassLoader.java:354) at
> java.lang.ClassLoader.loadClass(ClassLoader.java:425) at
> sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308) at
> java.lang.ClassLoader.loadClass(ClassLoader.java:358) ... 9 more
> {code}
> Usually, the reduce task succeeds on retry.
> Some of the symptoms are similar to HADOOP-8423, but this fix is already
> included (this is on Hadoop 2.6).
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