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From "Nick Dimiduk (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-13579) Avoid isCellTTLExpired() for NO-TAG cases
Date Tue, 12 May 2015 16:14:00 GMT

    [ https://issues.apache.org/jira/browse/HBASE-13579?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14540135#comment-14540135
] 

Nick Dimiduk commented on HBASE-13579:
--------------------------------------

This was committed to branch-1.1 after RC0 tag. Because RC1 includes only specific few fixes
on top of RC0, I branched for RC1 (branch-1.1.0) to add only those fixes. This will be go
out with 1.1.1. Sorry for the confusion [~anoop.hbase].

> Avoid isCellTTLExpired() for NO-TAG cases
> -----------------------------------------
>
>                 Key: HBASE-13579
>                 URL: https://issues.apache.org/jira/browse/HBASE-13579
>             Project: HBase
>          Issue Type: Sub-task
>          Components: Scanners
>    Affects Versions: 1.0.0, 1.0.1
>            Reporter: ramkrishna.s.vasudevan
>            Assignee: ramkrishna.s.vasudevan
>             Fix For: 2.0.0, 0.98.14, 1.0.2, 1.2.0, 1.1.1
>
>         Attachments: HBASE-13579_0.98.patch, HBASE-13579_0.98_1.patch, HBASE-13579_1.patch,
HBASE-13579_2.patch, HBASE-13579_KVExtension.patch, HBASE-13579_branch-1.patch, HBASE-13579_branch-1_1.patch,
HBASE-13579_storelevel.patch
>
>
> As observed in this JIRA's performance test, we are always calling the isCellTTLExpired()
for every cell and internally it is parsing the keyLength, valueLength() to get the tagsLength
after which we decide whether Cell level TTL is present are not.
> This JIRA aims to avoid this check if all the readers of the storescanner knows that
there are no tags to read.  Note that, for the memstore scanner we will do that in another
JIRA, which I suppose Stack had already raised to avoid tag length while flushing (for the
NO-TAG) case.



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