hbase-issues mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "stack (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-13291) Lift the scan ceiling
Date Thu, 19 Mar 2015 19:39:39 GMT
stack created HBASE-13291:
-----------------------------

             Summary: Lift the scan ceiling
                 Key: HBASE-13291
                 URL: https://issues.apache.org/jira/browse/HBASE-13291
             Project: HBase
          Issue Type: Improvement
          Components: Scanners
    Affects Versions: 1.0.0
            Reporter: stack
            Assignee: stack


Scanning medium sized rows with multiple concurrent scanners exhibits interesting 'ceiling'
properties. A server runs at about 6.7k ops a second using 450% of possible 1600% of CPUs
 when 4 clients each with 10 threads doing scan 1000 rows.  If I add '--filterAll' argument
(do not return results), then we run at 1450% of possible 1600% possible but we do 8k ops
a second.

Let me attach flame graphs for two cases. Unfortunately, there is some frustrating dark art
going on. Let me try figure it... Filing issue in meantime to keep score in.



--
This message was sent by Atlassian JIRA
(v6.3.4#6332)

Mime
View raw message