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