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Hudson commented on HBASE-6423: ------------------------------- Integrated in HBase-TRUNK #3594 (See [https://builds.apache.org/job/HBase-TRUNK/3594/]) HBASE-6423 Writes should not block reads on blocking updates to memstores - Addendum (Revision 1417242) HBASE-6423 Writes should not block reads on blocking updates to memstores (Revision 1417078) Result = FAILURE tedyu : Files : * /hbase/trunk/hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/HRegion.java jxiang : Files : * /hbase/trunk/hbase-server/src/main/java/org/apache/hadoop/hbase/RegionTooBusyException.java * /hbase/trunk/hbase-server/src/main/java/org/apache/hadoop/hbase/master/RegionStates.java * /hbase/trunk/hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/HRegion.java * /hbase/trunk/hbase-server/src/test/java/org/apache/hadoop/hbase/regionserver/TestHRegion.java * /hbase/trunk/hbase-server/src/test/java/org/apache/hadoop/hbase/regionserver/TestHRegionBusyWait.java > Writes should not block reads on blocking updates to memstores > -------------------------------------------------------------- > > Key: HBASE-6423 > URL: https://issues.apache.org/jira/browse/HBASE-6423 > Project: HBase > Issue Type: Bug > Reporter: Karthik Ranganathan > Assignee: Jimmy Xiang > Fix For: 0.96.0, 0.94.4 > > Attachments: 0.94-6423.patch, 0.94-6423_v4.patch, 6423.addendum, > trunk-6423.patch, trunk-6423_v2.1.patch, trunk-6423_v2.patch, > trunk-6423_v3.2.patch, trunk-6423_v3.3.patch, trunk-6423_v3.4.patch, > trunk-6423_v4.patch > > > We have a big data use case where we turn off WAL and have a ton of reads and > writes. We found that: > 1. flushing a memstore takes a while (GZIP compression) > 2. incoming writes cause the new memstore to grow in an unbounded fashion > 3. this triggers blocking memstore updates > 4. in turn, this causes all the RPC handler threads to block on writes to > that memstore > 5. we are not able to read during this time as RPC handlers are blocked > At a higher level, we should not hold up the RPC threads while blocking > updates, and we should build in some sort of rate control. -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators For more information on JIRA, see: http://www.atlassian.com/software/jira