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From Robert Coli <rc...@eventbrite.com>
Subject Re: Huge amounts of hinted handoffs for counter table
Date Wed, 23 Sep 2015 20:56:45 GMT
On Wed, Sep 23, 2015 at 7:28 AM, Björn Hachmann <bjoern.hachmann@metrigo.de>
wrote:

> Today I realized that one of the nodes in our Cassandra cluster (2.1.7) is
> storing a lot of hints (>80GB) and I fail to see a convincing way to deal
> with them.
> ...
> We had a look into the table system.hints and from there we learnt that
> most hints
> are for one of the nodes in our 2nd datacenter and most of the mutations
> are
> increments to one of our counter tables which are very frequent.
>

This is probably timeouts on the increment creating your hints.


> We have several questions:
> - What could be the reason that only one of the nodes has hints for only
> one target node, altough every other node should be coordinator for these
> queries sometimes also?
>

That sounds unexpected, I don't have a good answer.


> - Is there a way to turn of hinted handoff on a table level or on data
> center level?
>

No.


> - What could we do to investigate the cause of this issue deeper?
>

Are the hints being successfully delivered? It sounds like not..

=Rob

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