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From "ryan rawson (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-1944) Add a "is synced" attribute to HTD
Date Fri, 30 Oct 2009 00:50:59 GMT

    [ https://issues.apache.org/jira/browse/HBASE-1944?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12771725#action_12771725
] 

ryan rawson commented on HBASE-1944:
------------------------------------

this is absolutely necessary to achieve high performance and data safety under the presence
of hdfs-265, since the best case scenario will be about 1000 fsync/second.

I am not super fond of the name, since synced suggests perhaps that the data isnt written
to disk or something, which is NOT true.

Perhaps PER_TX_FLUSH :-)

> Add a "is synced" attribute to HTD
> ----------------------------------
>
>                 Key: HBASE-1944
>                 URL: https://issues.apache.org/jira/browse/HBASE-1944
>             Project: Hadoop HBase
>          Issue Type: Improvement
>            Reporter: Jean-Daniel Cryans
>            Assignee: Jean-Daniel Cryans
>             Fix For: 0.21.0
>
>         Attachments: HBASE-1944.patch
>
>
> At SU we have a case where we'd like to be able to, by default, sync every appended edit
but for some tables have the control to disable their sync. You could then rely on other tables
like .META. to do syncs, the optional log syncer timer down in LogSyncer and user tables that
are always synced. For example, set a 10ms timer on the log syncer so that in the worse case
you lose 10ms of non-catalog edits.

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