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From "stack (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-12148) Remove TimeRangeTracker as point of contention when many threads writing a Store
Date Wed, 13 Apr 2016 23:34:25 GMT

    [ https://issues.apache.org/jira/browse/HBASE-12148?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15240239#comment-15240239
] 

stack commented on HBASE-12148:
-------------------------------

Thanks [~lhofhansl] for the reminder.

Yes, original report was write time.

We don't actually do what the original report was complaining of originally where we are updating
TR in MemStore but yeah, I see at flush time we could be doing lots of new instance creations...
almost one per Cell as we write them out. Probably fine given they are short-lived objects.
We could do your suggestion of two implementations.... The attached one for read time where
many threads contending and then another for the case where one thread only writing. Let me
look.

> Remove TimeRangeTracker as point of contention when many threads writing a Store
> --------------------------------------------------------------------------------
>
>                 Key: HBASE-12148
>                 URL: https://issues.apache.org/jira/browse/HBASE-12148
>             Project: HBase
>          Issue Type: Sub-task
>          Components: Performance
>    Affects Versions: 2.0.0, 0.99.1
>            Reporter: stack
>            Assignee: Walter Koetke
>             Fix For: 2.0.0, 1.3.0, 0.98.19
>
>         Attachments: 0001-In-AtomicUtils-change-updateMin-and-updateMax-to-ret.patch,
12148.addendum.txt, 12148.txt, 12148.txt, 12148v2.txt, 12148v2.txt, HBASE-12148-V3.patch,
HBASE-12148-V3.patch, HBASE-12148.txt, HBASE-12148V2.txt, Screen Shot 2014-10-01 at 3.39.46
PM.png, Screen Shot 2014-10-01 at 3.41.07 PM.png, Screen Shot 2016-04-13 at 1.49.30 PM.png,
Screen Shot 2016-04-13 at 2.02.22 PM.png, TimeRangeTracker.tiff
>
>




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