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stack commented on HBASE-12751: ------------------------------- v23 is building now over on hadoopqa. It failed TestPerColumnFamilyFlush and this fails local for me too. Looking. > Allow RowLock to be reader writer > --------------------------------- > > Key: HBASE-12751 > URL: https://issues.apache.org/jira/browse/HBASE-12751 > Project: HBase > Issue Type: Bug > Components: regionserver > Affects Versions: 2.0.0, 1.3.0 > Reporter: Elliott Clark > Assignee: Elliott Clark > Fix For: 2.0.0, 1.3.0 > > Attachments: 12751v22.txt, 12751v23.txt, 12751v23.txt, > HBASE-12751-v1.patch, HBASE-12751-v10.patch, HBASE-12751-v10.patch, > HBASE-12751-v11.patch, HBASE-12751-v12.patch, HBASE-12751-v13.patch, > HBASE-12751-v14.patch, HBASE-12751-v15.patch, HBASE-12751-v16.patch, > HBASE-12751-v17.patch, HBASE-12751-v18.patch, HBASE-12751-v19 (1).patch, > HBASE-12751-v19.patch, HBASE-12751-v2.patch, HBASE-12751-v20.patch, > HBASE-12751-v20.patch, HBASE-12751-v21.patch, HBASE-12751-v3.patch, > HBASE-12751-v4.patch, HBASE-12751-v5.patch, HBASE-12751-v6.patch, > HBASE-12751-v7.patch, HBASE-12751-v8.patch, HBASE-12751-v9.patch, > HBASE-12751.patch > > > Right now every write operation grabs a row lock. This is to prevent values > from changing during a read modify write operation (increment or check and > put). However it limits parallelism in several different scenarios. > If there are several puts to the same row but different columns or stores > then this is very limiting. > If there are puts to the same column then mvcc number should ensure a > consistent ordering. So locking is not needed. > However locking for check and put or increment is still needed. -- This message was sent by Atlassian JIRA (v6.3.4#6332)