RE: All host pools Marked Down

[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

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