On Tue, May 15, 2012 at 5:41 PM, Dave Brosius <dbrosius@mebigfatguy.com> wrote:
The replication factor for a keyspace is stored in the system.schema_keyspaces column family.

Since you can't view this with cli as the server won't start, the only way to look at it, that i know of is to use the

sstable2json tool on the *.db file for that column family...

So for instance on my machine i do

./sstable2json /var/lib/cassandra/data/system/schema_keyspaces/system-schema_keyspaces-ia-1-Data.db

and get

"7374726573735f6b73": [["durable_writes","true",1968197311980145], ["name","stress_ks",1968197311980145], ["strategy_class","org.apache.cassandra.locator.SimpleStrategy",1968197311980145], ["strategy_options","{\"replication_factor\":\"3\"}",1968197311980145]]

It's likely you don't have a entry from replication_factor.

Yep, I checked the system.schema_keyspaces ColumnFamily, and there was no replication_factor value, as you suspected.  But the dev cluster that worked after upgrade did have that value, so it started up okay.  Apparently pre-1.1 was less picky about its presence.
Theoretically i suppose you could embellish the output, and use json2sstable to fix it, but I have no experience here, and would get the blessings of datastax fellas, before proceeding.

Actually, I went ahead and took a chance because I had already completely offline for several hours and wanted to get things back up.  I did what you suggested and added the replication_factor value to the json returned from sstable2json and imported it using json2sstable.  Fortunately I had the dev cluster values to use as a basis.  I started things up, and it worked like a champ.  Thanks!