Brandon Williams created CASSANDRA-11332:
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Summary: nodes connect to themselves when NTS is used
Key: CASSANDRA-11332
URL: https://issues.apache.org/jira/browse/CASSANDRA-11332
Project: Cassandra
Issue Type: Bug
Components: Core
Reporter: Brandon Williams
Fix For: 2.1.x
I tested this with both the simple snitch and PFS. It's quite easy to repro,
setup a cluster, start it. Mine looks like this:
{noformat}
tcp 0 0 10.208.8.123:48003 10.208.8.63:7000 ESTABLISHED
26254/java
tcp 0 0 10.208.8.123:7000 10.208.8.63:40215 ESTABLISHED
26254/java
tcp 0 0 10.208.8.123:55559 10.208.35.225:7000 ESTABLISHED
26254/java
tcp 0 0 10.208.8.123:33498 10.208.8.63:7000 ESTABLISHED
26254/java
tcp 0 0 10.208.8.123:7000 10.208.35.225:52530 ESTABLISHED
26254/java
tcp 0 0 10.208.8.123:7000 10.208.35.225:53674 ESTABLISHED
26254/java
tcp 0 0 10.208.8.123:40846 10.208.35.225:7000 ESTABLISHED
26254/java
tcp 0 0 10.208.8.123:7000 10.208.8.63:48880 ESTABLISHED
26254/java
{noformat}
No problems so far. Now create a keyspace using NTS with an rf of 3, and
perform some writes. Now it looks like this:
{noformat}
tcp 0 0 10.208.8.123:48003 10.208.8.63:7000 ESTABLISHED
26254/java
tcp 0 0 10.208.8.123:7000 10.208.8.123:35024 ESTABLISHED
26254/java
tcp 0 0 10.208.8.123:35024 10.208.8.123:7000 ESTABLISHED
26254/java
tcp 0 0 10.208.8.123:47212 10.208.8.123:7000 ESTABLISHED
26254/java
tcp 0 0 10.208.8.123:7000 10.208.8.63:40215 ESTABLISHED
26254/java
tcp 0 0 10.208.8.123:55559 10.208.35.225:7000 ESTABLISHED
26254/java
tcp 0 0 10.208.8.123:33498 10.208.8.63:7000 ESTABLISHED
26254/java
tcp 0 0 10.208.8.123:7000 10.208.35.225:52530 ESTABLISHED
26254/java
tcp 0 0 10.208.8.123:7000 10.208.35.225:53674 ESTABLISHED
26254/java
tcp 0 0 10.208.8.123:7000 10.208.8.123:47212 ESTABLISHED
26254/java
tcp 0 0 10.208.8.123:40846 10.208.35.225:7000 ESTABLISHED
26254/java
tcp 0 0 10.208.8.123:7000 10.208.8.63:48880 ESTABLISHED
26254/java
{noformat}
I can't think of any reason for a node to connect to itself, and this can cause
problems with PFS where you might only define the broadcast addresses, but now
you need the internal addresses to because the node will need to look itself up
when connecting to itself.
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