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From "Duo Zhang (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-18055) Releasing L2 cache HFileBlocks before shipped() when switching from pread to stream causes result corruption
Date Tue, 16 May 2017 13:22:04 GMT

     [ https://issues.apache.org/jira/browse/HBASE-18055?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Duo Zhang updated HBASE-18055:
------------------------------
      Resolution: Fixed
    Hadoop Flags: Reviewed
          Status: Resolved  (was: Patch Available)

Pushed to master.

Thanks all for reviewing.

> Releasing L2 cache HFileBlocks before shipped() when switching from pread to stream causes
result corruption
> ------------------------------------------------------------------------------------------------------------
>
>                 Key: HBASE-18055
>                 URL: https://issues.apache.org/jira/browse/HBASE-18055
>             Project: HBase
>          Issue Type: Bug
>          Components: regionserver, Scanners
>    Affects Versions: 2.0.0
>            Reporter: ramkrishna.s.vasudevan
>            Assignee: Duo Zhang
>             Fix For: 2.0.0
>
>         Attachments: HBASE-18055.patch
>
>
> In HBASE-17917 tries to switch from pread to stream read when a specific size of bytes
are read. So in order to switch over, it closes the existing scanners and creates a new scanners
with pread=false.
> When we close the exisitng scanners - if the blocks are served from offheap cache we
will decrement the ref count on those blocks and if it becomes zero we make the block ready
for eviction. Then there is a chance that the result could be corrupted if new blocks occupy
the cache. So the expectation was that till the RPC call completes the response we will hold
on to the blocks that are referred by the scan. (except the last one). So trying to switch
over to stream read will break this expectation and hence TestBlockEvictionfromclient fails.




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