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From "ramkrishna.s.vasudevan (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-16372) References to previous cell in read path should be avoided
Date Thu, 06 Oct 2016 06:19:20 GMT

     [ https://issues.apache.org/jira/browse/HBASE-16372?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

ramkrishna.s.vasudevan updated HBASE-16372:
-------------------------------------------
    Attachment: HBASE-16372_9.patch

Updated patch. Removes all the factory related changes and creates every writer as ShipperListener.
Will raise another JIRA to fix all the factory related updates like making CompacitonSpecific
writers so that only those writers are of type ShipperListener.

> References to previous cell in read path should be avoided
> ----------------------------------------------------------
>
>                 Key: HBASE-16372
>                 URL: https://issues.apache.org/jira/browse/HBASE-16372
>             Project: HBase
>          Issue Type: Sub-task
>          Components: Scanners
>    Affects Versions: 2.0.0
>            Reporter: ramkrishna.s.vasudevan
>            Assignee: ramkrishna.s.vasudevan
>            Priority: Blocker
>             Fix For: 2.0.0
>
>         Attachments: HBASE-16372_1.patch, HBASE-16372_2.patch, HBASE-16372_3.patch, HBASE-16372_5_withfactory.patch,
HBASE-16372_6_withfactory.patch, HBASE-16372_7_withfactory.patch, HBASE-16372_9.patch, HBASE-16372_testcase.patch,
HBASE-16372_testcase_1.patch
>
>
> Came as part of review discussion in HBASE-15554. If there are references kept to previous
cells in the read path, with the Ref count based eviction mechanism in trunk, then chances
are there to evict a block backing the previous cell but the read path still does some operations
on that garbage collected previous cell leading to incorrect results.
> Areas to target
> -> Storescanner
> -> Bloom filters (particularly in compaction path)
> Thanks to [~anoop.hbase] to point out this in bloomfilter path. But we found it could
be in other areas also.



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