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Posted to user@cassandra.apache.org by "B. Todd Burruss" <bb...@real.com> on 2010/03/09 00:31:31 UTC
DigestMismatchException
i am seeing a lot of these INFO level messages in cassandra server's
logs:
2010-03-08 15:30:08,123 INFO [pool-1-thread-625]
[StorageProxy.java:485] DigestMismatchException: Mismatch for key
vmguest85__1349889195 (076e19c042e3756a619a8b3fcdd1b9f2 vs
6a2d12aebba5c51c1d9a60cd0ec556d9)
anything to worry about?
thx
Re: DigestMismatchException
Posted by Jonathan Ellis <jb...@gmail.com>.
yes.
On Mon, Mar 8, 2010 at 5:40 PM, B. Todd Burruss <bb...@real.com> wrote:
> i'm doing quorum reads and quorum writes with N=3 and 4 node cluster. i am
> "updating" values in cassandra cluster at a fairly high rate.
>
> so does this mean that a read is obtaining its two values (because of
> "quorum") and one of them must have been from the "third" replica that may
> not have been updated yet by async replication?
>
> On Mon, 2010-03-08 at 15:36 -0800, Jonathan Ellis wrote:
>
> It means that you're doing a lot of reads that saw multiple versions
> of the answer, which depending on your workload may be normal
>
> On Mon, Mar 8, 2010 at 5:31 PM, B. Todd Burruss <bb...@real.com> wrote:
>> i am seeing a lot of these INFO level messages in cassandra server's logs:
>>
>> 2010-03-08 15:30:08,123 INFO [pool-1-thread-625] [StorageProxy.java:485]
>> DigestMismatchException: Mismatch for key vmguest85__1349889195
>> (076e19c042e3756a619a8b3fcdd1b9f2 vs 6a2d12aebba5c51c1d9a60cd0ec556d9)
>>
>> anything to worry about?
>>
>> thx
>
>
Re: DigestMismatchException
Posted by "B. Todd Burruss" <bb...@real.com>.
i'm doing quorum reads and quorum writes with N=3 and 4 node cluster. i
am "updating" values in cassandra cluster at a fairly high rate.
so does this mean that a read is obtaining its two values (because of
"quorum") and one of them must have been from the "third" replica that
may not have been updated yet by async replication?
On Mon, 2010-03-08 at 15:36 -0800, Jonathan Ellis wrote:
> It means that you're doing a lot of reads that saw multiple versions
> of the answer, which depending on your workload may be normal
>
> On Mon, Mar 8, 2010 at 5:31 PM, B. Todd Burruss <bb...@real.com> wrote:
> > i am seeing a lot of these INFO level messages in cassandra server's logs:
> >
> > 2010-03-08 15:30:08,123 INFO [pool-1-thread-625] [StorageProxy.java:485]
> > DigestMismatchException: Mismatch for key vmguest85__1349889195
> > (076e19c042e3756a619a8b3fcdd1b9f2 vs 6a2d12aebba5c51c1d9a60cd0ec556d9)
> >
> > anything to worry about?
> >
> > thx
Re: DigestMismatchException
Posted by Jonathan Ellis <jb...@gmail.com>.
It means that you're doing a lot of reads that saw multiple versions
of the answer, which depending on your workload may be normal
On Mon, Mar 8, 2010 at 5:31 PM, B. Todd Burruss <bb...@real.com> wrote:
> i am seeing a lot of these INFO level messages in cassandra server's logs:
>
> 2010-03-08 15:30:08,123 INFO [pool-1-thread-625] [StorageProxy.java:485]
> DigestMismatchException: Mismatch for key vmguest85__1349889195
> (076e19c042e3756a619a8b3fcdd1b9f2 vs 6a2d12aebba5c51c1d9a60cd0ec556d9)
>
> anything to worry about?
>
> thx