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From Jonathan Ellis <>
Subject Re: frequent "unknown result" errors
Date Mon, 12 Apr 2010 15:05:52 GMT
unknown result means thrift is badly confused.  You will get this when
using the same thrift connection from multiple threads, for instance.

On Mon, Apr 12, 2010 at 10:02 AM, Lee Parker <> wrote:
> I am a newbie with Cassandra.  We are currently migrating a large amount of
> data out of MySQL into Cassandra.  I have two ColumnFamilies.  One contains
> one row per item and each item has roughly 12 columns.  These are items from
> REST APIs like the Twitter API.  Then I have a second ColumnFamily with very
> large rows and TimeUUID column names which contain the key of the items in
> the other ColumnFamily.  So one ColumnFamily has lots of rows with a low
> number of columns per row, and the other has relatively few rows with a
> large (~500k) columns per row.
> I am getting rather frequent errors with "unknown result" from get_slice and
> multiget_slice calls from the index ColumnFamily.  I am using Pandra for the
> calls.  I can see that this is a generic exception thrown by the Cassandra
> Thrift package when it doesn't know what else to say.  Is there a way to
> actually see what the result was in a more raw form from the Thrift
> protocol?
> One thought I had on why this is happening is that my results might be
> larger than the configuration settings.  Does anyone have any good ideas on
> how to calculate what the ideal values of SlicedBufferSizeInKB
> and ColumnIndexSizeInKB should be?  If these are too low, would i get a more
> descriptive error?
> Lee Parker

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