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From "stack (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-13579) Avoid isCellTTLExpired() for NO-TAG cases
Date Tue, 28 Apr 2015 14:30:07 GMT

    [ https://issues.apache.org/jira/browse/HBASE-13579?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14517097#comment-14517097
] 

stack commented on HBASE-13579:
-------------------------------

I would be in favor of shoving the info into a new Cell type rather than changing the read
path adding flags; the former makes for better encapsulation and hopefully makes the read
path traversal more direct.

Thanks for making this a subtask of HBASE-13291.  Suggest linking the issue that will tag
hfiles when no tags present.

> 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: 2.0.0
>            Reporter: ramkrishna.s.vasudevan
>            Assignee: ramkrishna.s.vasudevan
>         Attachments: HBASE-13579_KVExtension.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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