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From "Jesse Yates (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-7725) Add generic attributes to CP initiated compaction request AND latch on compaction completion
Date Fri, 15 Feb 2013 19:03:14 GMT

    [ https://issues.apache.org/jira/browse/HBASE-7725?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13579415#comment-13579415
] 

Jesse Yates commented on HBASE-7725:
------------------------------------

bq. may not need generic Object attributes to pre/postCompactSelection in if we pass in the
nascent CompactionRequest reference there too

I worry that we will start to pervert the compactionRequest creation logic for what is a relatively
rare case - a user requested compaction via a CP (or at least that was the original intent,
not sure what everyone will do with this). 

But an interesting idea (and another refactor :). So instead of passing in the attributes
you pass in a compaction request to the CompactSplitThread? Something like, "if the request
is null we do the usual logic and build the request only after we get through all the selection
logic in HStore. If not null, we apply the same logic, but set attributes on the compaction
request (e.g. the store files to compact) on the passed in request"? That certainly gets me
what I need (controlled compactions) and hides the attribute business all the way down.

Is that what you were getting at? I like it Andrew. 
                
> Add generic attributes to CP initiated compaction request AND latch on compaction completion
> --------------------------------------------------------------------------------------------
>
>                 Key: HBASE-7725
>                 URL: https://issues.apache.org/jira/browse/HBASE-7725
>             Project: HBase
>          Issue Type: Bug
>          Components: Compaction, Coprocessors, regionserver
>            Reporter: Jesse Yates
>            Assignee: Jesse Yates
>             Fix For: 0.96.0, 0.94.6
>
>         Attachments: example.java, hbase-7725_0.94-v0.patch, hbase-7725-v0.patch, hbase-7725-v1.patch,
hbase-7725-v3.patch, hbase-7725_with-attributes-0.94-v0.patch, hbase-7725_with-attributes-0.94-v1.patch
>
>
> You can request that a compaction be started, but you can't be sure when that compaction
request completes. This is a simple update to the CompactionRequest interface and the compact-split
thread on the RS that doesn't actually impact the RS exposed interface.
> This is particularly useful for CPs so they can control starting/running a compaction.

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