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
