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From "Brandon Williams (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-7122) Replacement nodes have null entries in system.peers
Date Tue, 06 May 2014 18:23:36 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-7122?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13990938#comment-13990938
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Brandon Williams commented on CASSANDRA-7122:
---------------------------------------------

When I replace with a different ip, I get the inverse problem:

{noformat}
 peer          | data_center | host_id                              | rack  | release_version
| rpc_address   | schema_version                       | tokens
---------------+-------------+--------------------------------------+-------+-----------------+---------------+--------------------------------------+--------------------------
 10.208.35.225 | datacenter1 | 36f346bc-d186-415e-a1aa-8d4839823755 | rack1 | 1.2.16-SNAPSHOT
| 10.208.35.225 | 7ed7c061-913f-3cf0-9c8d-a192d3a988db |                     null
{noformat}

Tokens is null, but that is the IP that was replaced and shouldn't be there at all.  This
patch fixes this behavior too, however.

> 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
>            Assignee: Brandon Williams
>             Fix For: 1.2.17
>
>         Attachments: 7122.txt
>
>
> 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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