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From "Jonathan Ellis (JIRA)" <>
Subject [jira] Commented: (CASSANDRA-406) SSTable File Metrics per CF
Date Tue, 08 Sep 2009 21:57:58 GMT


Jonathan Ellis commented on CASSANDRA-406:

Map<String, String> getDataLocationSpaceInfo()

should be <String, Long> -- just give the raw byte count, let the consuming agent decide
how to reformat if at all.

also -- to play devil's advocate, should this really be in cassandra?  am-i-running-out-of-disk-space
is better gotten from the OS which actually knows the device layout.

Map<String, Long> getSSTablesInfo()

I'm having trouble imagining how this would be useful.  What did you have in mind?

int getQueueLengthOfSSTableLock

note that CASSANDRA-414 will probably be removing sstablelock Real Soon Now.

Map<Long, List<String>> getCompactionBucketInfo

It seems to me that we need min/max/mean/stdev for this to really be useful, not just mean.
 What do you think?

> SSTable File Metrics per CF
> ---------------------------
>                 Key: CASSANDRA-406
>                 URL:
>             Project: Cassandra
>          Issue Type: New Feature
>    Affects Versions: 0.5
>            Reporter: Chris Goffinet
>            Assignee: Sammy Yu
>            Priority: Minor
>             Fix For: 0.5
>         Attachments: 0001-Expose-out-queue-length-of-sstable-lock-in-MBean-int.patch,
> We should add sstable-physical-files per CF in cfstats mbean

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