Thread contention over row locks set monitor
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Key: HBASE-3894
URL: https://issues.apache.org/jira/browse/HBASE-3894
Project: HBase
Issue Type: Bug
Affects Versions: 0.90.2
Reporter: Dave Latham
Priority: Blocker
Fix For: 0.90.4
Attachments: regionserver_rowLock_set_contention.threads.txt
HRegion maintains a set of row locks. Whenever any thread attempts to lock or
release a row it needs to acquire the monitor on that set. We've been
encountering cases with 30 handler threads all contending for that monitor,
blocked progress on the region server. Clients timeout, and retry making it
worse, and the region server stops responding to new clients almost entirely.
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