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https://issues.apache.org/jira/browse/HDFS-10569?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15347826#comment-15347826
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Weiwei Yang commented on HDFS-10569:
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It looks like the 2nd test in {{TestBlockListAsLongs#testDatanodeDetect}} was
still using new-style BP, that's why the code was not called in UT. I modified
that part in 002 patch. Without the patch, it will throw OutOfIndex error, the
patch fixes this issue when DN sends old-style BR.
Please take a look at the new patch and the test case. Thanks a lot.
> A bug causes OutOfIndex error in BlockListAsLongs
> -------------------------------------------------
>
> Key: HDFS-10569
> URL: https://issues.apache.org/jira/browse/HDFS-10569
> Project: Hadoop HDFS
> Issue Type: Bug
> Affects Versions: 2.7.0
> Reporter: Weiwei Yang
> Assignee: Weiwei Yang
> Priority: Minor
> Attachments: HDFS-10569.001.patch, HDFS-10569.002.patch
>
>
> An obvious bug in LongsDecoder.getBlockListAsLongs(), the size of var *longs*
> is +2 to the size of *values*, but the for-loop accesses *values* using
> *longs* index. This will cause OutOfIndex.
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