[jira] Commented: (HBASE-1944) Add a "is synced" attribute to HTD

["ryan rawson (JIRA)" <ji...@apache.org>]

    [ 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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