Altering a tables that splits can hold the command for the CatalogJanitor sleep
time
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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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