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https://issues.apache.org/jira/browse/HBASE-6561?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Lars Hofhansl updated HBASE-6561:
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Attachment: 6561-0.96-v2.txt
Here's a better patch. A MemStoreScanner now remembers the last KV that was
ever iterated to and makes sure we never go backwards from that in a reseek
(reseeks must be going forward).
The other observation is that taking continuous tailSets of tailSets will make
things worse (from looking the code... the amount of work is the same, but
through more layers of indirection).
As before, please have a careful look, this is a pretty core part of HBase.
> 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
>
>
> 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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