Lars Hofhansl created HBASE-6561:
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Summary: 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
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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