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From "Sergey Shelukhin (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-9648) collection one expired storefile causes it to be replaced by another expired storefile
Date Wed, 25 Sep 2013 23:41:02 GMT

    [ https://issues.apache.org/jira/browse/HBASE-9648?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13778235#comment-13778235
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Sergey Shelukhin commented on HBASE-9648:
-----------------------------------------

For the expired selection check, candidate list is not the same as list of files in store.
For the other check logic for last file is ok, presence of data in input doesn't mean that
there'd be anything in the output... I wonder if simpler check is possible when selecting.
I will be in some meetings, let me thing about it.
>From code perspective looks ok. Can you create a test?

                
> collection one expired storefile causes it to be replaced by another expired storefile
> --------------------------------------------------------------------------------------
>
>                 Key: HBASE-9648
>                 URL: https://issues.apache.org/jira/browse/HBASE-9648
>             Project: HBase
>          Issue Type: Bug
>          Components: Compaction
>            Reporter: Sergey Shelukhin
>            Assignee: Jean-Marc Spaggiari
>         Attachments: HBASE-9648-v0-0.94.patch, HBASE-9648-v0-trunk.patch, HBASE-9648-v1-trunk.patch
>
>
> There's a shortcut in compaction selection that causes the selection of expired store
files to quickly delete.
> However, there's also the code that ensures we write at least one file to preserve seqnum.
This new empty file is "expired", because it has no data, presumably.
> So it's collected again, etc.
> This affects 94, probably also 96.

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