[jira] Updated: (HBASE-1939) HLog group commit

["Jean-Daniel Cryans (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HBASE-1939?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jean-Daniel Cryans updated HBASE-1939:
--------------------------------------

    Attachment: HBASE-1939.patch

Patch that implements the group commit but that also cleans up HDFS-200 era code. Passes all tests

- I remove LogFlusher in favor of the LogSyncer thread. This also fixes the fact that the optional log flush value was never use.
- I use an AtomicBoolean to force sync. This part was tricky because there is no message passing between the client thread and the LogSyncer.


> HLog group commit
> -----------------
>
>                 Key: HBASE-1939
>                 URL: https://issues.apache.org/jira/browse/HBASE-1939
>             Project: Hadoop HBase
>          Issue Type: New Feature
>            Reporter: Jean-Daniel Cryans
>            Assignee: Jean-Daniel Cryans
>             Fix For: 0.21.0
>
>         Attachments: HBASE-1939.patch
>
>
> Currently multiple clients writing to a RS are serialized when sync'ing their appends. Implementing group commit can help this by being aware of all the clients in that queue.

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