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From Thomas Richter <...@tricnet.de>
Subject Re: Existing column(s) not readable
Date Sun, 09 Oct 2011 18:42:19 GMT
Hi,

here is some further information. Compaction did not help, but data is
still there when I dump the row with sstable2json.

Best,

Thomas

On 10/08/2011 11:30 PM, Thomas Richter wrote:
> Hi,
> 
> we are running a 3 node cassandra (0.7.6-2) cluster and some of our
> column families contain quite large rows (400k+ columns, 4-6GB row size).
> Replicaton factor is 3 for all keyspaces. The cluster is running fine
> for several months now and we never experienced any serious trouble.
> 
> Some days ago we noticed, that some previously written columns could not
> be read. This does not always happen, and only some dozen columns out of
> 400k are affected.
> 
> After ruling out application logic as a cause I dumped the row in
> question with sstable2json and the columns are there (and are not marked
> for deletion).
> 
> Next thing was setting up a fresh single node cluster and copying the
> column family data to that node. Columns could not be read either.
> Right now I'm running a nodetool compact for the cf to see if data could
> be read afterwards.
> 
> Is there any explanation for such behavior? Are there any suggestions
> for further investigation?
> 
> TIA,
> 
> Thomas


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