See how you can lock a row -- it returns a RowLock instance -- here http://hadoop.apache.org/hbase/docs/r0.19.0/api/org/apache/hadoop/hbase/client/HTable.html#lockRow(byte[]). Then see how elsewhere in HTable, all operations optionally take a RowLock instance. Unlock the row when done using this method: http://hadoop.apache.org/hbase/docs/r0.19.0/api/org/apache/hadoop/hbase/client/HTable.html#unlockRow(org.apache.hadoop.hbase.client.RowLock) .
A single server at any one time will be hosting the region that contains the row you are locking. When you get a RowLock its held by this host. Ergo, no need for it to be distributed. St.Ack On Mon, Feb 16, 2009 at 8:07 AM, Michael Dagaev <[email protected]>wrote: > Hi, all > > Is this class intended for public use? > > Can I use it to lock a row, read and update the row data > and unlock the row ? I guess it is not a distributed lock I need > but I want to be sure ... > > What I need is a some way to lock a row, read and update the data > and unlock the row after the update. > > Thank you for your cooperation, > M. >
