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From Ryan King <r...@twitter.com>
Subject Re: hinted handoff sleeping
Date Thu, 23 Jun 2011 21:59:33 GMT
On Thu, Jun 23, 2011 at 2:55 PM, Jeffrey Wang <jwang@palantir.com> wrote:
> Hey all,
>
>
>
> We’re running a slightly patched version of 0.7.3 on a cluster of 5 nodes.
> I’ve been noticing a number of messages in our logs which look like this
> (after a node goes “down” and comes back up, usually just due to a GC):
>
>
>
> 2011-06-23 14:46:35,381 INFO [HintedHandoff:1]
> org.apache.cassandra.db.HintedHandOffManager.deliverHintsToEndpoint(HintedHandOffManager.java:290)
> {USER='',IP=''} - Sleeping 32649ms to stagger hint delivery
>
>
>
> The interesting thing is that we have hinted_handoff_enabled = false in the
> YAML configuration, so it always says 0 rows are handed off (later, after
> the sleep). Thus this sleeping seems quite wasteful. Is this part of the
> code supposed to be reach even with hinted handoff disabled? Thanks.

Did you previously run with HH on? That config setting prohibits new
hints from being created, but doesn't prevent existing ones from being
delivered.

-ryan

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