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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-12719) Add test WAL provider to quantify FSHLog overhead in the absence of HDFS.
Date Thu, 01 Jan 2015 00:19:13 GMT

    [ https://issues.apache.org/jira/browse/HBASE-12719?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14262508#comment-14262508
] 

Hudson commented on HBASE-12719:
--------------------------------

FAILURE: Integrated in HBase-TRUNK #5983 (See [https://builds.apache.org/job/HBase-TRUNK/5983/])
HBASE-12719 test provider to remove just the hdfs interactions from fshlog. (busbey: rev a90e64c6373437e109e6d84adbf11ea8bf296e53)
* hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/wal/FSHLog.java
* hbase-server/src/main/java/org/apache/hadoop/hbase/wal/DisabledWALProvider.java
* hbase-server/src/test/java/org/apache/hadoop/hbase/wal/IOTestProvider.java


> 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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