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https://issues.apache.org/jira/browse/HBASE-5974?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13287974#comment-13287974
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Anoop Sam John commented on HBASE-5974:
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@Ted
Will look into your comments and need a rebase for 94 patch too..
I will make seperate patch fro trunk also.
wrt pre and post CP hooks, it is not only creating a new custom RegionScanner,
but may be creating a wrapper for the actual RegionScanner. In one of our
impl, we use this approach. [Just a wrapper which delegates the calls with some
extra steps for next() calls. ] Here also if we add new methods to
RegionScanner interface which deals with the check and incerement for this
seqNo, will get exposed to user. I felt this might look odd for them.
> Scanner retry behavior with RPC timeout on next() seems incorrect
> -----------------------------------------------------------------
>
> Key: HBASE-5974
> URL: https://issues.apache.org/jira/browse/HBASE-5974
> Project: HBase
> Issue Type: Bug
> Components: client, regionserver
> Affects Versions: 0.90.7, 0.92.1, 0.94.0, 0.96.0
> Reporter: Todd Lipcon
> Assignee: Anoop Sam John
> Priority: Critical
> Fix For: 0.94.1
>
> Attachments: HBASE-5974_0.94.patch, HBASE-5974_94-V2.patch
>
>
> I'm seeing the following behavior:
> - set RPC timeout to a short value
> - call next() for some batch of rows, big enough so the client times out
> before the result is returned
> - the HConnectionManager stuff will retry the next() call to the same server.
> At this point, one of two things can happen: 1) the previous next() call will
> still be processing, in which case you get a LeaseException, because it was
> removed from the map during the processing, or 2) the next() call will
> succeed but skip the prior batch of rows.
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