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From "Lars Hofhansl (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-6561) Gets/Puts with many column send the RegionServer into an "endless" loop
Date Sun, 12 Aug 2012 21:40:37 GMT

     [ https://issues.apache.org/jira/browse/HBASE-6561?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Lars Hofhansl updated HBASE-6561:
---------------------------------

    Attachment: 6561-0.94.txt

Here's a 0.94 (that where the problem was reported) patch that does what I describe above.
Can't say I like it.
                
> Gets/Puts with many column 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
>
>
> 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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