On Sun, Sep 2, 2012 at 2:13 AM, Lin Ma <[email protected]> wrote: > Hello guys, > > I am reading the book "HBase, the definitive guide", at the beginning of > chapter 3, it is mentioned in order to reduce performance impact for > clients to update the same row (lock contention issues for automatic > write), batch update is preferred. My questions is, for MR job, what are > the batch update methods we could leverage to resolve the issue? And for > API client, what are the batch update methods we could leverage to resolve > the issue? >
Do you actually have a problem where there is contention on a single row? Use methods like http://hbase.apache.org/apidocs/org/apache/hadoop/hbase/client/HTable.html#put(java.util.List) or the batch methods listed earlier in the API. You should set autoflush to false too: http://hbase.apache.org/apidocs/org/apache/hadoop/hbase/client/HTableInterface.html#isAutoFlush() Even batching, a highly contended row might hold up inserts... but for sure you actually have this problem in the first place? St.Ack
