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Ted Yu commented on HBASE-17434: -------------------------------- The file downloaded from review board is HBASE-17379-V01.patch So this issue is related to HBASE-17379. Have you considered my review comment ? The read only copy seems to try to fix the issue reported in HBASE-17379 but I don't see getScanners() being modified. I suggest continuing discussion on HBASE-17379 where there is more context. > New Synchronization Scheme for Compaction Pipeline > -------------------------------------------------- > > Key: HBASE-17434 > URL: https://issues.apache.org/jira/browse/HBASE-17434 > Project: HBase > Issue Type: Bug > Reporter: Eshcar Hillel > Attachments: HBASE-17434-V01.patch > > > A new copyOnWrite synchronization scheme is introduced for the compaction > pipeline. > The new scheme is better since it removes the lock from getSegments() which > is invoked in every get and scan operation, and it reduces the number of > LinkedList objects that are created at runtime, thus can reduce GC (not by > much, but still...). > In addition, it fixes the method getTailSize() in compaction pipeline. This > method creates a MemstoreSize object which comprises the data size and the > overhead size of the segment and needs to be atomic. -- This message was sent by Atlassian JIRA (v6.3.4#6332)