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https://issues.apache.org/jira/browse/HADOOP-15446?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16470848#comment-16470848
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Arun Suresh commented on HADOOP-15446:
--------------------------------------
Committed this to branch-2 and branch-2.9 as well (I didn't see a difference in
the code between branch-2 and trunk - so, instead of applying the provided
patch, I just cherry-picked the trunk commit and ran the tests - which passed)
> WASB: PageBlobInputStream.skip breaks HBASE replication
> -------------------------------------------------------
>
> Key: HADOOP-15446
> URL: https://issues.apache.org/jira/browse/HADOOP-15446
> Project: Hadoop Common
> Issue Type: Bug
> Components: fs/azure
> Affects Versions: 2.9.0, 3.0.2
> Reporter: Thomas Marquardt
> Assignee: Thomas Marquardt
> Priority: Major
> Fix For: 2.10.0, 3.2.0
>
> Attachments: HADOOP-15446-001.patch, HADOOP-15446-002.patch,
> HADOOP-15446-003.patch, HADOOP-15446-branch-2.001.patch
>
>
> Page Blobs are primarily used by HBASE. HBASE replication, which apparently
> has not been used with WASB until recently, performs non-sequential reads on
> log files using PageBlobInputStream. There are bugs in this stream
> implementation which prevent skip and seek from working properly, and
> eventually the stream state becomes corrupt and unusable.
> I believe this bug affects all releases of WASB/HADOOP. It appears to be a
> day-0 bug in PageBlobInputStream. There were similar bugs opened in the past
> (HADOOP-15042) but the issue was not properly fixed, and no test coverage was
> added.
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