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https://issues.apache.org/jira/browse/HDFS-12953?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Xiao Chen updated HDFS-12953:
-----------------------------
    Attachment: HDFS-12953.test.patch

> XORRawDecoder.doDecode throws NullPointerException
> --------------------------------------------------
>
>                 Key: HDFS-12953
>                 URL: https://issues.apache.org/jira/browse/HDFS-12953
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: erasure-coding
>    Affects Versions: 3.0.0
>            Reporter: Lei (Eddy) Xu
>            Assignee: Xiao Chen
>            Priority: Major
>         Attachments: HDFS-12953.test.patch
>
>
> Thanks [~danielpol] report on HDFS-12860.
> {noformat}
> 17/11/30 04:19:55 INFO mapreduce.Job: map 0% reduce 0%
> 17/11/30 04:20:01 INFO mapreduce.Job: Task Id : 
> attempt_1512036058655_0003_m_000002_0, Status : FAILED
> Error: java.lang.NullPointerException
> at 
> org.apache.hadoop.io.erasurecode.rawcoder.XORRawDecoder.doDecode(XORRawDecoder.java:83)
> at 
> org.apache.hadoop.io.erasurecode.rawcoder.RawErasureDecoder.decode(RawErasureDecoder.java:106)
> at 
> org.apache.hadoop.io.erasurecode.rawcoder.RawErasureDecoder.decode(RawErasureDecoder.java:170)
> at 
> org.apache.hadoop.hdfs.StripeReader.decodeAndFillBuffer(StripeReader.java:423)
> at 
> org.apache.hadoop.hdfs.StatefulStripeReader.decode(StatefulStripeReader.java:94)
> at org.apache.hadoop.hdfs.StripeReader.readStripe(StripeReader.java:382)
> at 
> org.apache.hadoop.hdfs.DFSStripedInputStream.readOneStripe(DFSStripedInputStream.java:318)
> at 
> org.apache.hadoop.hdfs.DFSStripedInputStream.readWithStrategy(DFSStripedInputStream.java:391)
> at org.apache.hadoop.hdfs.DFSInputStream.read(DFSInputStream.java:813)
> at java.io.DataInputStream.read(DataInputStream.java:149)
> at 
> org.apache.hadoop.examples.terasort.TeraInputFormat$TeraRecordReader.nextKeyValue(TeraInputFormat.java:257)
> at 
> org.apache.hadoop.mapred.MapTask$NewTrackingRecordReader.nextKeyValue(MapTask.java:563)
> at 
> org.apache.hadoop.mapreduce.task.MapContextImpl.nextKeyValue(MapContextImpl.java:80)
> at 
> org.apache.hadoop.mapreduce.lib.map.WrappedMapper$Context.nextKeyValue(WrappedMapper.java:91)
> at org.apache.hadoop.mapreduce.Mapper.run(Mapper.java:145)
> at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:794)
> at org.apache.hadoop.mapred.MapTask.run(MapTask.java:342)
> at org.apache.hadoop.mapred.YarnChild$2.run(YarnChild.java:174)
> at java.security.AccessController.doPrivileged(Native Method)
> at javax.security.auth.Subject.doAs(Subject.java:422)
> at 
> org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1962)
> at org.apache.hadoop.mapred.YarnChild.main(YarnChild.java:168)
> {noformat}



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