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https://issues.apache.org/jira/browse/HBASE-5954?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13276333#comment-13276333
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Lars Hofhansl commented on HBASE-5954:
--------------------------------------
Finally some numbers for "PerformanceEvaluation --nomapred --rows=100000
--presplit=3 randomWrite 10"
Without WAL/HFile sync: ~18s
With WAL sync: ~34s
With WAL sync on, I see a constant ~70mb/s write load. Without WAL sync I see a
few spikes of far higher IO load.
This is all on a single machine with HBase in fully distributed mode on top of
a pseudo distributed HDFS.
Note that my patch does not yet do HFile sync'ing correctly.
> Allow proper fsync support for HBase
> ------------------------------------
>
> Key: HBASE-5954
> URL: https://issues.apache.org/jira/browse/HBASE-5954
> Project: HBase
> Issue Type: Improvement
> Reporter: Lars Hofhansl
> Assignee: Lars Hofhansl
> Attachments: 5954-trunk-hdfs-trunk-v2.txt, 5954-trunk-hdfs-trunk.txt,
> hbase-hdfs-744.txt
>
>
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