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http://review.cloudera.org/r/691/
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Review request for hbase.
Summary
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This patch removes newScannerLock and renames splitAndClose lock to just
"lock". Every operation is now required to obtain the read lock on "lock"
before doing anything (including getting a row lock). This is done by calling
openRegionTransaction inside a try statement and by calling
closeRegionTransaction in finally.
flushcache got refactored some more in order to do the locking in the proper
order; first get the read lock, then do the writestate handling.
Finally, it removes the need to have a writeLock when flushing when subclassers
give atomic work do to via internalPreFlushcacheCommit. This means that this
patch breaks external contribs. This is required to keep our whole locking
mechanism simpler.
This addresses bug HBASE-2915.
http://issues.apache.org/jira/browse/HBASE-2915
Diffs
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/trunk/src/main/java/org/apache/hadoop/hbase/regionserver/HRegion.java 987300
/trunk/src/main/java/org/apache/hadoop/hbase/regionserver/SplitTransaction.java
987300
/trunk/src/test/java/org/apache/hadoop/hbase/regionserver/TestSplitTransaction.java
987300
Diff: http://review.cloudera.org/r/691/diff
Testing
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5 concurrent ICV threads + randomWrite 3 + scans on a single RS. I'm also in
the process of deploying it on a cluster.
Thanks,
Jean-Daniel
