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From "Jean-Daniel Cryans (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-4794) Altering a tables that splits can hold the command for the CatalogJanitor sleep time
Date Wed, 16 Nov 2011 00:23:51 GMT
Altering a tables that splits can hold the command for the CatalogJanitor sleep time
------------------------------------------------------------------------------------

                 Key: HBASE-4794
                 URL: https://issues.apache.org/jira/browse/HBASE-4794
             Project: HBase
          Issue Type: Bug
    Affects Versions: 0.92.0
            Reporter: Jean-Daniel Cryans
            Priority: Critical
             Fix For: 0.92.0, 0.94.0


In AssignmentManager.getReopenStatus, it calls a version of MetaReader.getTableRegions that
sets excludeOfflinedSplitParents to false meaning that the offline parents are returned. What
this means is that if one of them was already closed before the alter command was issued (and
I believe there are a few other cases) then the alter will hang until the CatalogJanitor sweeps
the parent .META. row.

Since the CJ sleep time is 5 minutes, the worst case scenario is an alter that takes almost
5 minutes.

Here's an example:

{quote}
925/948 regions updated.
920/943 regions updated.
913/934 regions updated.
912/928 regions updated.
912/928 regions updated.

(5 minutes later)

912/928 regions updated.
912/928 regions updated.
905/918 regions updated.
897/906 regions updated.
891/892 regions updated.
891/891 regions updated.
Done.
{quote}

I can confirm with the log that 37 parent regions were cleaned up.

Also it's pretty nice to see how the number fluctuates up and down :)

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