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From "Jonathan Gray (JIRA)" <j...@apache.org>
Subject [jira] Created: (HBASE-1177) Delay when client is located on the same node as the regionserver
Date Tue, 03 Feb 2009 04:52:59 GMT
Delay when client is located on the same node as the regionserver

                 Key: HBASE-1177
                 URL: https://issues.apache.org/jira/browse/HBASE-1177
             Project: Hadoop HBase
          Issue Type: Bug
    Affects Versions: 0.19.0
         Environment: Linux 2.6.25 x86_64
            Reporter: Jonathan Gray
            Priority: Blocker
             Fix For: 0.20.0

During testing of HBASE-80, we uncovered a strange 40ms delay for random reads.  We ran a
series of tests and found that it only happens when the client is on the same node as the
RS and for a certain range of payloads (not specifically related to number of columns or size
of them, only total payload).  It appears to be precisely 40ms every time.

Unsure if this is particular to our architecture, but it does happen on all nodes we've tried.
 Issue completely goes away with very large payloads or moving the client.

Will post a test program tomorrow if anyone can test on a different architecture.

Making a blocker for 0.20.  Since this happens when you have an MR task running local to the
RS, and this is what we try to do, might also consider making this a blocker for 0.19.1.

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