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From Rohit Kelkar <rohitkel...@gmail.com>
Subject uneven region distribution
Date Fri, 14 Feb 2014 23:52:31 GMT
I am using hbase version 0.92.4 on a 5 node cluster. I am seeing that a
particular region server often crashes. A status 'simple' on hbase shell
gives the following stats

HBase Shell; enter 'help<RETURN>' for list of supported commands. Type
"exit<RETURN>" to leave the HBase Shell Version 0.94.2, r1395367, Sun Oct 7
19:11:01 UTC 2012
status 'simple' 4 live servers
server7:60020 1392017875910 requestsPerSecond=0, numberOfOnlineRegions=419,
usedHeapMB=3315, maxHeapMB=6127
server4:60020 1392300859332 requestsPerSecond=843,
numberOfOnlineRegions=379, usedHeapMB=2070, maxHeapMB=6127
server3:60020 1391583646998 requestsPerSecond=429,
numberOfOnlineRegions=653, usedHeapMB=3198, maxHeapMB=6127
server6:60020 1391583647588 requestsPerSecond=0, numberOfOnlineRegions=966,
usedHeapMB=2975, maxHeapMB=6127 1 dead servers
server5,60020,1392108515637 Aggregate load: 1272, regions: 2417

The dead region server has 2417 regions as opposed to 419, 379, 653, 966
regions on other servers. Am I right in attributing the region server crash
to the disproportionately high number of regions on that server?

If I invoke the balancer on hbase shell using the "balancer" command it
returns true. But it does not change the status of the assignments.

- R

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