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From "Lars Hofhansl (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-5954) Allow proper fsync support for HBase
Date Fri, 12 Oct 2012 16:25:04 GMT

    [ https://issues.apache.org/jira/browse/HBASE-5954?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13475114#comment-13475114
] 

Lars Hofhansl commented on HBASE-5954:
--------------------------------------

I disagree, having the signal out for the DNs to sync durably to disk now (even if they only
do as soon as they get to it) is better than having an indefinite amount in which the data
on only in volatile memory (which is as good as we can get with only hflush).

But let's not harp this point... We all agree that it needs to be fixed.

I could use some help testing HDFS-3979. I believe the pipeline tests cover the failure scenarios
(which are the same whether we flush/sync or not), the test needed there is verifying that
the fsync is on the synchronous path of the client.

                
> 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
>             Fix For: 0.94.3, 0.96.0
>
>         Attachments: 5954-trunk-hdfs-trunk.txt, 5954-trunk-hdfs-trunk-v2.txt, 5954-trunk-hdfs-trunk-v3.txt,
5954-trunk-hdfs-trunk-v4.txt, 5954-trunk-hdfs-trunk-v5.txt, 5954-trunk-hdfs-trunk-v6.txt,
hbase-hdfs-744.txt
>
>


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