hbase-issues mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Nicolas Liochon (JIRA)" <j...@apache.org>
Subject [jira] [Comment Edited] (HBASE-12116) Hot contention spots; writing
Date Wed, 15 Apr 2015 10:51:00 GMT

    [ https://issues.apache.org/jira/browse/HBASE-12116?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14496031#comment-14496031
] 

Nicolas Liochon edited comment on HBASE-12116 at 4/15/15 10:50 AM:
-------------------------------------------------------------------

I had a look at crc a while ago.
My understanding back then was that there are specific instruction in x86 processors to calculate
crc, unfortunately a little bit different than the standard crc32. When I was looking at Intel/Hadoop
roadmap 2 years ago, it looked like Intel was planning to do the changes in hadoop to use
the hw one.

There is some info here: http://www.strchr.com/crc32_popcnt



was (Author: nkeywal):
I had a look at crc a while ago.
My understanding back then was that there are specific instruction in x86 processors to calculate
crc, unfortunately a little bit different than the standard crc32. When I was looking at Intel/Hadoop
roadmap 2 years ago, it looked like Intel was planning to do the changes in hadoop to use
the hw one.

There are some info here: http://www.strchr.com/crc32_popcnt


> Hot contention spots; writing
> -----------------------------
>
>                 Key: HBASE-12116
>                 URL: https://issues.apache.org/jira/browse/HBASE-12116
>             Project: HBase
>          Issue Type: Bug
>            Reporter: stack
>            Assignee: stack
>         Attachments: 12116.checkForReplicas.txt, 12116.stringify.and.cache.scanner.maxsize.txt,
12116.txt, Screen Shot 2014-09-29 at 5.12.51 PM.png, Screen Shot 2014-09-30 at 10.39.34 PM.png,
Screen Shot 2015-04-13 at 2.03.05 PM.png, perf.write3.svg, perf.write4.svg
>
>
> Playing with flight recorder, here are some write-time contentious synchronizations/locks
(picture coming)



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

Mime
View raw message