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https://issues.apache.org/jira/browse/CASSANDRA-2941?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13095288#comment-13095288
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Sylvain Lebresne commented on CASSANDRA-2941:
---------------------------------------------
for the records, this patch had the following lines:
{noformat}
AtomicLong c = timeoutsPerHost.get(ip);
if (c == null)
c = timeoutsPerHost.put(ip, new AtomicLong());
c.incrementAndGet();
{noformat}
which are a guaranteed NPE.
I've fixed that directly though (in r1164068).
> Expose number of rpc timeouts for individual hosts metric via jmx
> ------------------------------------------------------------------
>
> Key: CASSANDRA-2941
> URL: https://issues.apache.org/jira/browse/CASSANDRA-2941
> Project: Cassandra
> Issue Type: Improvement
> Reporter: Melvin Wang
> Assignee: Melvin Wang
> Priority: Minor
> Fix For: 0.8.5
>
> Attachments: c2941-v2.patch
>
>
> We have a total number timeouts for each node. It's better for monitoring to
> break down this total number into number of timeouts per host that this node
> tried to connect to.
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