On Sat, Sep 15, 2012 at 10:31 AM, jlei liu <[email protected]> wrote: > I use Hbase0.94.1 and hadoop-0.20.2-cdh3u5. > > The Hbase0.94.1 write checksums in HBase block, so we don't need to read > checksums from metadata file of block file. But I find the BlockSender > still read checksums from metadata file of block file every time,
How are you figuring this? That sounds like a regression. In 0.94.x the default is that hbase.regionserver.checksum.verify is true which should have hbase doing checksum verify on read rather than hdfs. > so the > Hbase0.94.1 can't decrease the iops, that is right? If that is right, > should I set the hbase.regionserver.checksum.verify property to false in > order to avoid the Hbase0.94.1 to verify th checksum? > It would be interesting flipping the switch. If things went faster, then for sure there is a regression. St.Ack
