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https://issues.apache.org/jira/browse/HBASE-13579?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14540742#comment-14540742
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Hudson commented on HBASE-13579:
--------------------------------
FAILURE: Integrated in HBase-0.98 #986 (See
[https://builds.apache.org/job/HBase-0.98/986/])
HBASE-13579 Avoid isCellTTLExpired() for NO-TAG cases (Ramkrishna S. Vasudevan)
(apurtell: rev ba58da6b0dafd1244de2f2d3550bf1ba3ce221df)
* hbase-server/src/main/java/org/apache/hadoop/hbase/io/hfile/HFileReaderV2.java
* hbase-server/src/main/java/org/apache/hadoop/hbase/io/hfile/HFileReaderV3.java
* hbase-common/src/main/java/org/apache/hadoop/hbase/NoTagsKeyValue.java
> 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, 0.98.13, 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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