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Zhihong Ted Yu commented on HBASE-6561: --------------------------------------- The fact that patch v2 passed unit test suite gave me confidence in the approach. +1 from me. Of course, review from Mikhail, et. al would be appreciated. > 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 -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators: https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa For more information on JIRA, see: http://www.atlassian.com/software/jira