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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-14489) postScannerFilterRow consumes a lot of CPU
Date Sun, 27 Sep 2015 01:55:05 GMT

    [ https://issues.apache.org/jira/browse/HBASE-14489?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14909556#comment-14909556
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Hudson commented on HBASE-14489:
--------------------------------

FAILURE: Integrated in HBase-1.0 #1060 (See [https://builds.apache.org/job/HBase-1.0/1060/])
HBASE-14489 postScannerFilterRow consumes a lot of CPU. (larsh: rev 8ea34aea023952df21f6ede66b63536960400ec1)
* hbase-server/src/test/java/org/apache/hadoop/hbase/coprocessor/TestRegionObserverInterface.java
* hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/RegionCoprocessorHost.java
* hbase-server/src/test/java/org/apache/hadoop/hbase/coprocessor/SimpleRegionObserver.java


> postScannerFilterRow consumes a lot of CPU
> ------------------------------------------
>
>                 Key: HBASE-14489
>                 URL: https://issues.apache.org/jira/browse/HBASE-14489
>             Project: HBase
>          Issue Type: Bug
>            Reporter: Lars Hofhansl
>            Assignee: Lars Hofhansl
>              Labels: performance
>             Fix For: 2.0.0, 1.2.0, 1.3.0, 0.98.15, 1.0.3, 1.1.3
>
>         Attachments: 14489-0.98.txt, 14489-master.txt
>
>
> During an unrelated test I found that when scanning a tall table with CQ only and filtering
most results at the server, 50%(!) of time is spend in postScannerFilterRow, even though the
coprocessor does nothing in that hook.
> We need to find a way not to call this hook when not needed, or to question why we have
this hook at all.
> I think [~ram_krish] added the hook (or maybe [~anoop.hbase]). I am also not sure whether
Phoenix uses this hook ([~giacomotaylor]?)



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