hbase-issues mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Andrew Purtell (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-14489) postScannerFilterRow consumes a lot of CPU
Date Sat, 26 Sep 2015 05:51:04 GMT

    [ https://issues.apache.org/jira/browse/HBASE-14489?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14909114#comment-14909114
] 

Andrew Purtell commented on HBASE-14489:
----------------------------------------

Yes that equality test is safe because the coprocessor classloader delegates to the parent
for org.apache.hbase.* and select others, which will be the same one used to load the regionserver's
classes. 

> 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
>
>
> 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]?)



--
This message was sent by Atlassian JIRA
(v6.3.4#6332)

Mime
View raw message