cassandra-user mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From Jacob Shadix <>
Subject Re: UnknownColumnFamilyException after removing all Cassandra data
Date Mon, 13 Feb 2017 12:35:35 GMT
The node will not bootstrap if it is listed as a seed node.

-- Jacob Shadix

On Tue, Feb 7, 2017 at 12:16 PM, Simone Franzini <>

> To further add to my previous answer, the node in question is a seed node,
> so it did not bootstrap.
> Should I remove it from the list of seed nodes and then try to restart it?
> Simone Franzini, PhD
> On Tue, Feb 7, 2017 at 9:43 AM, Simone Franzini <>
> wrote:
>> This is exactly what I did on the second node. If this is not the correct
>> / best procedure to adopt in these cases, please advise:
>> 1. Removed all the data, including the system table (rm -rf data/
>> commitlog/ saved_caches).
>> 2. Configured the node to replace itself, by adding the following line to
>> JVM_OPTS="$JVM_OPTS -Dcassandra.replace_address=<node
>> own IP address>"
>> 3. Start the node.
>> Noticeably, I did not do nodetool decommission or removenode. Is that the
>> recommended approach?
>> Given what I did, I am mystified as to what the problem is. If I query
>> the system.schema_columnfamilies on the affected node, all CF IDs are
>> there. Same goes for the only other node that is currently up. Also, the
>> other node that is currently up has data for all those CF IDs in the data
>> folder.
>> Simone Franzini, PhD
>> On Tue, Feb 7, 2017 at 5:39 AM, kurt greaves <>
>> wrote:
>>> The node is trying to communicate with another node, potentially
>>> streaming data, and is receiving files/data for an "unknown column family".
>>> That is, it doesn't know about the CF with the id
>>> e36415b6-95a7-368c-9ac0-ae0ac774863d.
>>> If you deleted some columnfamilies but not all the system keyspace and
>>> restarted the node I'd expect this error to occur. Or I suppose if you
>>> didn't decommission the node properly before blowing the data away and
>>> restarting.
>>> You'll have to give us more information on what your exact steps were on
>>> this 2nd node:
>>> When you say deleted all Cassandra data, did this include the system
>>> tables? Were your steps to delete all the data and then just restart the
>>> node? Did you remove the node from the cluster prior to deleting the data
>>> and restarting it (nodetool decommission/removenode? Did the node rejoin
>>> the cluster or did it have to bootstrap?

View raw message