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From "Anoop Sam John (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-7869) Provide way to not start LogSyncer thread
Date Fri, 22 Feb 2013 03:50:13 GMT

    [ https://issues.apache.org/jira/browse/HBASE-7869?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13583882#comment-13583882
] 

Anoop Sam John commented on HBASE-7869:
---------------------------------------

I will wait for HBASE-7801 to go in as that is introducing the per Mutation deferred log sync
capability.
bq.In light of this, do you still want to do this? Maybe for your use case it is better to
temporarily block the syncer thread from syncing in the background?
IMHO for our use case doing this blocking and then unblocking is extra overhead. I think there
will be many use cases which will need immediate sync.
                
> Provide way to not start LogSyncer thread
> -----------------------------------------
>
>                 Key: HBASE-7869
>                 URL: https://issues.apache.org/jira/browse/HBASE-7869
>             Project: HBase
>          Issue Type: Bug
>          Components: regionserver, wal
>            Reporter: Anoop Sam John
>            Assignee: Anoop Sam John
>             Fix For: 0.96.0, 0.94.6
>
>         Attachments: HBASE-7869_Trunk.patch
>
>
> In our usecase we want all the Mutations on all the tables to be immediately written
and synced to WAL. We dont want the LogSyncer thread to be running in such a case.
> In minbatch operation we write entries to WAL and we use postWALWrite and write some
more WAL entries(Only write no sync). We want all these written data to be synced as one unit
(at the sync step in doMiniBatchOperation) But if the LogSyncer thread is running in the system
it can come and do the sync at any point in time which we dont want in our case.

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