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From "stack (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-2231) Compaction events should be written to HLog
Date Tue, 20 Nov 2012 18:38:59 GMT

    [ https://issues.apache.org/jira/browse/HBASE-2231?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13501364#comment-13501364
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stack commented on HBASE-2231:
------------------------------

So, test passes because we are able to read from deleted file because dfsclient has block
locations cached.  I suppose this makes sense it is just a little unexpected (It took me a
while to figure it).

Not sure how test failed in the past.  My guess is that in the past we were strict when you
went to compact that all referenced files had to be present.  That is no longer the case in
that we seem to be loosey-goosey about it to handle the case where a compaction may have run
before ours.  Let me look into this more.
                
> Compaction events should be written to HLog
> -------------------------------------------
>
>                 Key: HBASE-2231
>                 URL: https://issues.apache.org/jira/browse/HBASE-2231
>             Project: HBase
>          Issue Type: Improvement
>          Components: regionserver
>            Reporter: Todd Lipcon
>            Assignee: Todd Lipcon
>            Priority: Blocker
>              Labels: moved_from_0_20_5
>             Fix For: 0.96.0
>
>         Attachments: 2231-testcase-0.94.txt, 2231-testcase_v2.txt, 2231v2.txt, hbase-2231-testcase.txt,
hbase-2231.txt
>
>
> The sequence for a compaction should look like this:
> # Compact region to "new" files
> # Write a "Compacted Region" entry to the HLog
> # Delete "old" files
> This deals with a case where the RS has paused between step 1 and 2 and the regions have
since been reassigned.

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