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From Jonathan Ellis <jbel...@gmail.com>
Subject Re: hinted handoff sleeping
Date Thu, 23 Jun 2011 22:36:23 GMT
(1) you should upgrade to a stable release instead of a frankenbuild

(2) hh_enabled just controls whether it creates new hints.  it will
still attempt to deliver existing ones.  this is essentially free if
no such hints exist.

tldr: it's harmless.

On Thu, Jun 23, 2011 at 4:55 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.
>
>
>
> -Jeffrey
>
>



-- 
Jonathan Ellis
Project Chair, Apache Cassandra
co-founder of DataStax, the source for professional Cassandra support
http://www.datastax.com

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