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From "stack (JIRA)" <j...@apache.org>
Subject [jira] Created: (HBASE-2237) [performance] Reading from memory only we can't use all CPU.
Date Thu, 18 Feb 2010 19:58:28 GMT
[performance] Reading from memory only we can't use all CPU.
------------------------------------------------------------

                 Key: HBASE-2237
                 URL: https://issues.apache.org/jira/browse/HBASE-2237
             Project: Hadoop HBase
          Issue Type: Bug
            Reporter: stack


>From the list from Erik Rozendaal:

{code}

We're getting about 2500 gets/sec max per regionserver when it serves data from the block
cache using HBase 0.20.3. All data is in the same region and the region has just one store
file for the family we're querying. HBASE-2180 didn't seem to help here. At this point the
region server is using about 1.5 cores. Since we have 8 cores available the bottleneck does
not seem to be CPU.

The number of clients does not seem to matter (we tested with 1-4 clients).

The only other bottleneck that I can think of is network, but we test on a local 1 Gbit LAN.
Our web server can handle 15,000 requests/sec, so that doesn't seem to be the case.

Maybe there is some synchronization going limiting the CPU scalability of a single region
server?
{code}

If same speed whether 1 or 4 clients, it would seem to indicate a synchronization issue.

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