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From cem <cayiro...@gmail.com>
Subject Re: All host pools Marked Down
Date Tue, 29 May 2012 14:25:14 GMT
It should retry but it doesn't. It is also clear that it delegates the
retry to the client " *Retry burden pushed out to client* " you can also
check Hector code. I wrote a separate service that retries when this
exception occurs.

I think you have a problem with your load balancer. Try to connect with
telnet.

Cem.

On Tue, May 29, 2012 at 3:06 PM, Shubham Srivastava <
Shubham.Srivastava@makemytrip.com> wrote:

>  My webapp connects to the LoadBalancer IP which has the actual nodes in
> its pool.
>
>  If there is by any chance a connection break then will hector not retry
> to re-establish connection I guess it should retry every XX seconds based
> on  retryDownedHostsDelayInSeconds .
>
>  Regards,
> Shubham
>  ------------------------------
> *From:* cem [cayiroglu@gmail.com]
> *Sent:* Tuesday, May 29, 2012 6:13 PM
> *To:* user@cassandra.apache.org
> *Subject:* Re: All host pools Marked Down
>
>   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
>>
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>>
>
>

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