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https://issues.apache.org/jira/browse/HDFS-13539?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16469077#comment-16469077
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Xiao Chen commented on HDFS-13539:
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Failed tests does not look related.
The synchronized changes are only for following best practice, I don't see any
real issues from there that could cause the NPE
> DFSInputStream NPE when reportCheckSumFailure
> ---------------------------------------------
>
> Key: HDFS-13539
> URL: https://issues.apache.org/jira/browse/HDFS-13539
> Project: Hadoop HDFS
> Issue Type: Bug
> Reporter: Xiao Chen
> Assignee: Xiao Chen
> Priority: Major
> Attachments: HDFS-13539.01.patch
>
>
> We have seem the following exception with DFSStripedInputStream.
> {noformat}
> readDirect: FSDataInputStream#read error:
> NullPointerException: java.lang.NullPointerException
> at
> org.apache.hadoop.hdfs.DFSStripedInputStream.readWithStrategy(DFSStripedInputStream.java:402)
> at org.apache.hadoop.hdfs.DFSInputStream.read(DFSInputStream.java:831)
> at
> org.apache.hadoop.fs.FSDataInputStream.read(FSDataInputStream.java:147)
> {noformat}
> Line 402 is {{reportCheckSumFailure}}, and {{currentLocatedBlock}} is the
> only possible null object.
> Original exception is masked by the NPE.
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