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From "Lars Hofhansl (Updated) (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-4198) Harmonize HBA flush, compact and majorCompact
Date Wed, 21 Mar 2012 19:11:43 GMT

     [ https://issues.apache.org/jira/browse/HBASE-4198?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Lars Hofhansl updated HBASE-4198:
---------------------------------

    Fix Version/s:     (was: 0.94.0)
                   0.96.0

Pushing to 0.96.
                
> Harmonize HBA flush, compact and majorCompact
> ---------------------------------------------
>
>                 Key: HBASE-4198
>                 URL: https://issues.apache.org/jira/browse/HBASE-4198
>             Project: HBase
>          Issue Type: Improvement
>    Affects Versions: 0.90.4
>            Reporter: Jean-Daniel Cryans
>             Fix For: 0.96.0
>
>
> As I mentioned on the mailing list, the way HBA.flush behaves is different from what
is used to be. Right now here's how flush and compact work:
>  - When calling HBA.flush it will fetch the list of regions then will contact their owners
directly one by one and the flush will be done inline. The major issue here is flushing a
big table will take a *long* time, but it does give some guarantee that all the flushes are
done. The old behavior was that all flushes were done async.
>  - For compactions it also calls every regions' owners one by one and instead of being
inline the compactions are queued. This is not very different from the old behavior, except
that the master has nothing to do now.
> What I believe we need to do:
>  - Both methods should have the same guarantees, either they return when everything is
flushed/compacted or they don't.
>  - If we do inlining, we should issue the requests in parallel a la HTable.batch.
>  - We definitely need to offer an async version.

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