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From "Richard Low (JIRA)" <j...@apache.org>
Subject [jira] [Created] (CASSANDRA-7122) Replacement nodes have null entries in system.peers
Date Wed, 30 Apr 2014 20:25:16 GMT
Richard Low created CASSANDRA-7122:
--------------------------------------

             Summary: Replacement nodes have null entries in system.peers
                 Key: CASSANDRA-7122
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-7122
             Project: Cassandra
          Issue Type: Bug
            Reporter: Richard Low


If a node is replaced with -Dcassandra.replace_address, the new node has mostly null entries
in system.peers:

{code}
> select * from system.peers;

 peer      | data_center | host_id | rack | release_version | rpc_address | schema_version
| tokens
-----------+-------------+---------+------+-----------------+-------------+----------------+--------------------------
 127.0.0.3 |        null |    null | null |            null |        null |           null
| {'-3074457345618258602'}
{code}

To reproduce, simply kill a node and replace it. The entries are correctly populated if the
replacement node is restarted but they are never populated if it isn't.

I can think of at least two bad consequences of this:

1. Drivers like Datastax java-driver use the peers table to find the rpc_address and location
info of a node. If the entires are null it assumes rpc_address=ip and the node is in the local
DC.
2. When using GossipingPropertyFileSnitch and node won't persist the DC/rack of another node
so may not be able to locate it during restarts.

I reproduced in 1.2.15 but from inspection it looks to be present in 1.2.16 and 2.0.7.



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