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From "Anoop Sam John (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-12719) Add test WAL provider to quantify FSHLog overhead in the absence of HDFS.
Date Tue, 30 Dec 2014 23:00:14 GMT

    [ https://issues.apache.org/jira/browse/HBASE-12719?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14261610#comment-14261610
] 

Anoop Sam John commented on HBASE-12719:
----------------------------------------

Very useful.. +1

> Add test WAL provider to quantify FSHLog overhead in the absence of HDFS.
> -------------------------------------------------------------------------
>
>                 Key: HBASE-12719
>                 URL: https://issues.apache.org/jira/browse/HBASE-12719
>             Project: HBase
>          Issue Type: Improvement
>          Components: test, wal
>            Reporter: Sean Busbey
>            Assignee: Sean Busbey
>            Priority: Minor
>             Fix For: 2.0.0, 1.1.0
>
>         Attachments: HBASE-12719.1.patch.txt, HBASE-12719.2.patch.txt, HBASE-12719_comparison_chart.tiff
>
>
> Discussion in HBASE-5699 included showing the max throughput for our WAL benchmark (using
the DisabledWALProvider) compared to when we are actually dealing with synchronization and
talking with HDFS.
> What we can't see in that comparison is how much of the (sizable) gap is due to the coordination
done in FSHLog to deal with multi-threading and how much of it is due to talking to HDFS.
> Make a test-only provider that we can use to isolate the cost for HDFS appends, HDFS
flush, and file rolling.



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