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From "Jean-Daniel Cryans (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-1939) HLog group commit
Date Wed, 28 Oct 2009 05:16:59 GMT

    [ https://issues.apache.org/jira/browse/HBASE-1939?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12770789#action_12770789
] 

Jean-Daniel Cryans commented on HBASE-1939:
-------------------------------------------

Raghu,

Thanks for looking at this patch, I guess I am wrong but in the way you described.

 !(true) && false => false == false then set it to true. That's ok you want to
let it true
 !(false) && false => false == false then set it to true. That's not ok we want
it to stay false
 !(false) && true => true != false then let it be false. That's not ok we want
it to be true
 !(true) && true => false != true then let it be true. That's ok you want it true

Also that value is reset in hsync to false.

So I indeed need to fix this thx!

> 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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