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From "ramkrishna.s.vasudevan (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-17049) Find out why AsyncFSWAL issues much more syncs than FSHLog
Date Thu, 24 Nov 2016 11:07:58 GMT

    [ https://issues.apache.org/jira/browse/HBASE-17049?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15692987#comment-15692987
] 

ramkrishna.s.vasudevan commented on HBASE-17049:
------------------------------------------------

Do you mean multiWAL per region? 
Do you have the infra to run with 3 nodes with AsyncWAL (and with PE) to see how much Fanout
is helping us. I think may be as there is only one node and there are flushes and compactions
this eventloop that waits for response from DN is getting delayed for the response. 

> Find out why AsyncFSWAL issues much more syncs than FSHLog
> ----------------------------------------------------------
>
>                 Key: HBASE-17049
>                 URL: https://issues.apache.org/jira/browse/HBASE-17049
>             Project: HBase
>          Issue Type: Sub-task
>          Components: wal
>    Affects Versions: 2.0.0
>            Reporter: Duo Zhang
>             Fix For: 2.0.0
>
>         Attachments: delay-sync.patch
>
>
> https://issues.apache.org/jira/browse/HBASE-16890?focusedCommentId=15647590&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-15647590



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