[jira] [Commented] (CASSANDRA-7767) Expose sizes of off-heap data structures via JMX and `nodetool info`

["Benjamin Lerer (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CASSANDRA-7767?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14224710#comment-14224710 ] 

Benjamin Lerer commented on CASSANDRA-7767:
-------------------------------------------

For 2.0 the component stored off heap are:
* Bloom filter
* Compression offsets map
* Partition summary

In 2.1 part of the Memtables can be moved off heaps via the memtable_allocation_type option. 
The 2 possibilities are: offheap_buffer and offheap_objects

> Expose sizes of off-heap data structures via JMX and `nodetool info`
> --------------------------------------------------------------------
>
>                 Key: CASSANDRA-7767
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-7767
>             Project: Cassandra
>          Issue Type: New Feature
>            Reporter: J.B. Langston
>            Assignee: Benjamin Lerer
>             Fix For: 2.0.12
>
>
> It would be very helpful for troubleshooting memory consumption to know the individual sizes of off-heap data structures such as bloom filters, index summaries, compression metadata, etc. Can we expose this over JMX? Also, since `nodetool info` already shows size of heap, key cache, etc. it seems like a natural place to show this.



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