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From "Duo Zhang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-17049) Find out why AsyncFSWAL issues much more syncs than FSHLog
Date Tue, 15 Nov 2016 14:06:58 GMT

    [ https://issues.apache.org/jira/browse/HBASE-17049?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15667229#comment-15667229

Duo Zhang commented on HBASE-17049:

I think I found a possible reason that why AsyncFSWAL issues 'more' syncs than FSHLog.

For FSHLog, if the currentPacket is full, then it will be queued to the dataQueue and processed
by DataStreamer. We do not consider this as a sync. But for AsyncFSWAL, every packet that
sent to DN will be included when compute the sync count. 

So the comparison of sync count in our WAL metrics is meaningless. We need to get the number
of packets sent to DN for FSHLog and compare it with the sync count for AsyncFSWAL.


> 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
> 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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