Delay when client is located on the same node as the regionserver
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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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