You are viewing a plain text version of this content. The canonical link for it is here.
Posted to commits@cassandra.apache.org by "Jonathan Ellis (Created) (JIRA)" <ji...@apache.org> on 2011/10/18 18:45:10 UTC
[jira] [Created] (CASSANDRA-3376) Track buffer cache hit rate with
mincore
Track buffer cache hit rate with mincore
----------------------------------------
Key: CASSANDRA-3376
URL: https://issues.apache.org/jira/browse/CASSANDRA-3376
Project: Cassandra
Issue Type: New Feature
Reporter: Jonathan Ellis
Priority: Minor
We could use mincore on, say, 1% of reads to be able to report actual buffer cache hit rate. This would be useful when troubleshooting slow reads, e.g., are reads to CF X slow because it's hitting disk, or because there are a lot of tombstones in the row?
--
This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators: https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa
For more information on JIRA, see: http://www.atlassian.com/software/jira
[jira] [Commented] (CASSANDRA-3376) Track buffer cache hit rate
with mincore
Posted by "Jonathan Ellis (Commented) (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/CASSANDRA-3376?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13129849#comment-13129849 ]
Jonathan Ellis commented on CASSANDRA-3376:
-------------------------------------------
Note that we already did a JNA mincore wrapper for CASSANDRA-1902 (which did not end up getting committed, but the patches are still there).
> Track buffer cache hit rate with mincore
> ----------------------------------------
>
> Key: CASSANDRA-3376
> URL: https://issues.apache.org/jira/browse/CASSANDRA-3376
> Project: Cassandra
> Issue Type: New Feature
> Reporter: Jonathan Ellis
> Priority: Minor
> Labels: ponies
>
> We could use mincore on, say, 1% of reads to be able to report actual buffer cache hit rate. This would be useful when troubleshooting slow reads, e.g., are reads to CF X slow because it's hitting disk, or because there are a lot of tombstones in the row?
--
This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators: https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa
For more information on JIRA, see: http://www.atlassian.com/software/jira