subject:"Re\: All host pools Marked Down"

RE: All host pools Marked Down

2012-05-29 Thread Shubham Srivastava

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 1, 
Gurgaon, Haryana - 122 016, India

[http://www.mailmktg.makemytrip.com/signature/images/bulb.gif]What's new? My 
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<><><><><>

Re: All host pools Marked Down

2012-05-29 Thread cem

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.srivast...@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
> 1, Gurgaon, Haryana - 122 016, India
>
> [image: http://www.mailmktg.makemytrip.com/signature/images/bulb.gif]*What's
> new?* My Trip Rewards - An exclusive loyalty program for MakeMyTrip
> customers. 
>
> [image:
> http://www.mailmktg.makemytrip.com/signature/images/MMT-signature-footer-V4.gif]
>
> [image: 
> http://www.mailmktg.makemytrip.com/signature/images/map-icon.gif]
> *Office Map*
>
> [image:
> http://www.mailmktg.makemytrip.com/signature/images/facebook-icon.gif]
> *Facebook*
>
> [image:
> http://www.mailmktg.makemytrip.com/signature/images/twitter-icon.gif]
> *Twitter*
>
>
>
<><><><><>

RE: All host pools Marked Down

2012-05-29 Thread Shubham Srivastava

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 [cayiro...@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 
mailto:shubham.srivast...@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<mailto: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 1, Gurgaon, Haryana - 122 016, India


[http://www.mailmktg.makemytrip.com/signature/images/bulb.gif]What's new? My 
Trip Rewards - An exclusive loyalty program for MakeMyTrip 
customers.<https://rewards.makemytrip.com/MTR>

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<><><><><>

Re: All host pools Marked Down

2012-05-29 Thread cem

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.srivast...@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 [cayiro...@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.srivast...@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
>> 1, Gurgaon, Haryana - 122 016, India
>>
>> [image: http://www.mailmktg.makemytrip.com/signature/images/bulb.gif]*What's
>> new?* My Trip Rewards - An exclusive loyalty program for MakeMyTrip
>> customers. <https://rewards.makemytrip.com/MTR>
>>
>> [image:
>> http://www.mailmktg.makemytrip.com/signature/images/MMT-signature-footer-V4.gif]<http://www.makemytrip.com/>
>>
>> [image: 
>> http://www.mailmktg.makemytrip.com/signature/images/map-icon.gif]<http://www.makemytrip.com/support/gurgaon-travel-agent-office.php>
>> *Office Map*
>>
>> [image:
>> http://www.mailmktg.makemytrip.com/signature/images/facebook-icon.gif]<http://www.facebook.com/pages/MakeMyTrip-Deals/120740541030?ref=search&sid=10077980239.1422657277..1>
>> *Facebook*
>>
>> [image:
>> http://www.mailmktg.makemytrip.com/signature/images/twitter-icon.gif]<http://twitter.com/makemytripdeals>
>> *Twitter*
>>
>>
>>
>
>
<><><><><>

Re: All host pools Marked Down

2012-05-30 Thread aaron morton

I would remove the load balancer from the equation.

Compactions do not stop the world, they may degrade performance for a while but 
thats about it. 

Look in the logs on the servers, are the nodes logging that other nodes are 
going DOWN ? 

Cheers

-
Aaron Morton
Freelance Developer
@aaronmorton
http://www.thelastpickle.com

On 30/05/2012, at 2:25 AM, cem wrote:

> 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 
>  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 [cayiro...@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 
>  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 1, 
> Gurgaon, Haryana - 122 016, India
> 
> What's new? My Trip Rewards - An exclusive loyalty program for 
> MakeMyTrip customers.
> 
> 
> 
> 
> Office Map
> 
> 
> Facebook
> 
> 
> Twitter
> 
>  
> 
>

RE: All host pools Marked Down

Re: All host pools Marked Down

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