Thanks Viral.. Confusion came to me as the heading of the mails say abt SCR metric and finally speaks abt hbase handled checksum metric which are 2 features.. Agree that hbase checksum works only with SCR as of now, this might change later.. That is why I was just making it clear .. NP :)
As I said pls check the DFS client side log(RS log) for BlockReaderLocal. AFAIK there should not be HDFS_READ op log in DN side when the SCR is happening.. -Anoop- On Fri, Jul 5, 2013 at 1:31 PM, Viral Bajaria <[email protected]>wrote: > No worries, Anoop. Here is some clarification for this chain. > > It started initially to figure out how to check whether SCR is effective at > the RS or not. I could not find the metric anywhere in ganglia/JMX and > didn't find any RegionServer level metric either and so started looking at > my DN logs. I saw a lot of "clienttrace" logs which are basically logs for > HDFS_READ and HDFS_WRITE ops. I wanted to see if it's a valid assumption > that SCR is working if I don't see any clienttrace logs for the RS that is > hosted on the same box as the DN. > > Hopefully I clarified it. > > On Fri, Jul 5, 2013 at 12:55 AM, Anoop John <[email protected]> wrote: > > > Agree that right now the HBase handled checksum will work only with SCR. > > But it might work without SCR also later (as support come from HDFS).. > So > > I am not getting the direct relation btw the SCR metric and this one. Am > I > > missed some thing in the mail loop? Sorry just trying to be clear on this > > :) > > >
