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From "nkeywal (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-6561) Gets/Puts with many columns send the RegionServer into an "endless" loop
Date Tue, 14 Aug 2012 10:28:38 GMT

    [ https://issues.apache.org/jira/browse/HBASE-6561?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13434044#comment-13434044
] 

nkeywal commented on HBASE-6561:
--------------------------------

If I understand well the problem you're addressing, we may have a reseek asking to go before
the point we have already reached by the next()?

In your implementation, do you have to keep the row pointed by the iterator? You could use
the existing iterator with next(), as the iterators will be recreated at the end of the reseek?


                
> Gets/Puts with many columns send the RegionServer into an "endless" loop
> ------------------------------------------------------------------------
>
>                 Key: HBASE-6561
>                 URL: https://issues.apache.org/jira/browse/HBASE-6561
>             Project: HBase
>          Issue Type: Bug
>            Reporter: Lars Hofhansl
>            Assignee: Lars Hofhansl
>             Fix For: 0.96.0, 0.94.2
>
>         Attachments: 6561-0.94.txt, 6561-0.96.txt, 6561-0.96-v2.txt, 6561-0.96-v3.txt
>
>
> This came from the mailing this:
> We were able to replicate this behavior in a pseudo-distributed hbase
> (hbase-0.94.1) environment. We wrote a test program that creates a test
> table "MyTestTable" and populates it with random rows, then it creates a
> row with 60,000 columns and repeatedly updates it. Each column has a 18
> byte qualifier and a 50 byte value. In our tests, when we ran the
> program, we usually never got beyond 15 updates before it would flush
> for a really long time. The rows that are being updated are about 4MB
> each (minues any hbase metadata).
> It doesn't seem like it's caused by GC. I turned on gc logging, and
> didn't see any long pauses. This is the gc log during the flush.
> http://pastebin.com/vJKKXDx5
> This is the regionserver log with debug on during the same flush
> http://pastebin.com/Fh5213mg
> This is the test program we wrote.
> http://pastebin.com/aZ0k5tx2
> You should be able to just compile it, and run it against a running
> HBase cluster.
> $ java TestTable
> Carlos

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