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https://issues.apache.org/jira/browse/HBASE-1141?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jonathan Gray resolved HBASE-1141.
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Resolution: Won't Fix
Further experimentation showed there is a 40ms delay when a client is on the
same node as the regionserver, for certain payloads.
Since this is not a general issue and might even be tied to my particular
environment, will open another issue for that specific issue.
> Fetching large numbers of columns is slow outside of HDFS
> ---------------------------------------------------------
>
> Key: HBASE-1141
> URL: https://issues.apache.org/jira/browse/HBASE-1141
> Project: Hadoop HBase
> Issue Type: Bug
> Affects Versions: 0.20.0
> Reporter: Jonathan Gray
> Fix For: 0.20.0
>
>
> While working on a Cell cache, we have found during random-read tests that
> the number of columns has an enormous impact on performance. Accounting for
> increased HDFS access time, there is still a great deal of time being spent
> coming out of the Region and then across the wire to HTable.
> Erik Holstad has done this testing and will post some of his results here
> when completed.
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