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https://issues.apache.org/jira/browse/HDFS-7885?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14349358#comment-14349358
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Jing Zhao commented on HDFS-7885:
---------------------------------
Thanks for working on this, Nicholas! Looks like the failure was caused by the
change on the test TestShortCircuitLocalRead:
{code}
java.io.EOFException: End of file reached before reading fully.
at
org.apache.hadoop.hdfs.shortcircuit.TestShortCircuitLocalRead.checkFileContent(TestShortCircuitLocalRead.java:167)
at
org.apache.hadoop.hdfs.shortcircuit.TestShortCircuitLocalRead.doTestShortCircuitReadImpl(TestShortCircuitLocalRead.java:287)
at
org.apache.hadoop.hdfs.shortcircuit.TestShortCircuitLocalRead.doTestShortCircuitRead(TestShortCircuitLocalRead.java:244)
at
org.apache.hadoop.hdfs.shortcircuit.TestShortCircuitLocalRead.testReadFromAnOffset(TestShortCircuitLocalRead.java:333)
{code}
I.e., the reader could not read the newly appended data.
Besides, I guess we only need to add extra tests for legacy local reader?
> Datanode should not trust the generation stamp provided by client
> -----------------------------------------------------------------
>
> Key: HDFS-7885
> URL: https://issues.apache.org/jira/browse/HDFS-7885
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: datanode
> Affects Versions: 2.2.0
> Reporter: vitthal (Suhas) Gogate
> Assignee: Tsz Wo Nicholas Sze
> Priority: Critical
> Attachments: h7885_20150305.patch
>
>
> Datanode should not trust the generation stamp provided by client, since it
> is prefetched and buffered in client, and concurrent append may increase it.
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