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From Jonathan Ellis <jbel...@gmail.com>
Subject Re: High number of DigestMismatchException
Date Sun, 26 Sep 2010 21:33:27 GMT
It may be an indication of a lower-level problem in your cluster, e.g.
flakey network causing FD false positives causing writes to be
initially replicated to less than all 3 nodes.

On Sun, Sep 26, 2010 at 11:53 AM, Narendra Sharma
<narendra.sharma@gmail.com> wrote:
> We are seeing high number of DigestMismatchException on our Cassandra
> deployment. We have a cluster of 4 nodes with RF=3 and we read/write in
> Quorum. I understand some DigestMismatchException is normal and is the
> mechanism for Cassandra to ensure consistency by doing read-repair.
>
> In our case, even though we have 4 clients, only the client that writes the
> data, read the data because of request sharding at client end. So I would
> expect the replication to happen fast and data be consistent on the 3 copies
> before the read hits the cluster. The size of column value is approx 128K.
> We verified multiple times that the timestamp of all the clients is in sync.
>
> Is this something to worry about? How do we troubleshoot if this an issue?
>
>
> Thanks,
> Naren
>



-- 
Jonathan Ellis
Project Chair, Apache Cassandra
co-founder of Riptano, the source for professional Cassandra support
http://riptano.com

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