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From cem <cayiro...@gmail.com>
Subject Re: All host pools Marked Down
Date Tue, 29 May 2012 12:43:37 GMT
Since all hosts are seem to be down, Hector will not do retry. There should
be at least one node up in a cluster. Make sure that you have a proper
connection from your webapps to your cluster.

Cem.

On Tue, May 29, 2012 at 1:46 PM, Shubham Srivastava <
Shubham.Srivastava@makemytrip.com> wrote:

>  Any takers on this. Hitting us badly right now.
>
>  Regards,
> Shubham
>  ------------------------------
> *From:* Shubham Srivastava
> *Sent:* Tuesday, May 29, 2012 12:55 PM
> *To:* user@cassandra.apache.org
> *Subject:* All host pools Marked Down
>
>   I am getting this exception lot of times
>
>
>
> *me.prettyprint.hector.api.exceptions.HectorException: All host pools
> marked down. Retry burden pushed out to client.*
>
> * *
>
> What this causes is no data read/write from the ring from my WebApp.
>
>
>
> I have retries as 3 and can see that max retries 3 getting exhausted with
> the same error as above.
>
>
>
> Checked cfstats and tpstats nothing seem to be a problem.
>
>
>
> However through the logs I see lot of time taken in compactions like the
> below
>
>
>
> *INFO [CompactionExecutor:73] 2012-05-29 11:03:01,605
> CompactionManager.java (line 608) Compacted to
> /opt/cassandra-data/data/LH/UserPrefrences-tmp-g-8906-Data.db.  36,986,932
> to 36,961,554 (~99% of original) bytes for 132,743 keys.  Time: 112,910ms.
> *
>
>
>
> The time taken here seems pretty high. Will this cause a pause or read
> timeout etc.
>
>
>
> I have the connection from my web app through a hardware loadbalancer .
> Cassandra version is 0.8.6 with multi-DC ring on 6 nodes each in one DC.
>
> CL:1 and RF:3.
>
>
>
> Memeory:8Gb heap -> 14Gb Server memory with 8Core CPU.
>
>
>
> How do I move ahead in this.
>
>
>
> *Shubham Srivastava* *|* Technical Lead - Technology Development
>
> +91 124 4910 548   |  MakeMyTrip.com, 243 SP Infocity, Udyog Vihar Phase
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>
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