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From "ramkrishna.s.vasudevan (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-13579) Avoid isCellTTLExpired() for NO-TAG cases
Date Tue, 28 Apr 2015 12:09:06 GMT

    [ https://issues.apache.org/jira/browse/HBASE-13579?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14516931#comment-14516931
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ramkrishna.s.vasudevan commented on HBASE-13579:
------------------------------------------------

bq.When the tags length is 0, we will make the Object of the new class (KeyValue extension)
Yes this is the way I too thought, per Cell we can decide the tagsLength (by creating new
Cell).  But thought that then we may have to create two type of cells (one when tags are there
and another without tags)
The other option is to pass the info to the StoreScanner level to decide whether to use tags
are not.  This can be done also.
 

> 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
>
> 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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