[
https://issues.apache.org/jira/browse/HBASE-18055?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Gavin updated HBASE-18055:
--------------------------
Comment: was deleted
(was: A comment with security level 'jira-users' was removed.)
> 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
> Priority: Major
> 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.
--
This message was sent by Atlassian JIRA
(v7.6.3#76005)
