Sergio Bossa created CASSANDRA-5692:
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Summary: Race condition in detecting version on a mixed 1.1/1.2
cluster
Key: CASSANDRA-5692
URL: https://issues.apache.org/jira/browse/CASSANDRA-5692
Project: Cassandra
Issue Type: Bug
Affects Versions: 1.2.5, 1.1.9
Reporter: Sergio Bossa
On a mixed 1.1 / 1.2 cluster, starting 1.2 nodes fires sometimes a race
condition in version detection, where the 1.2 node wrongly detects version 6
for a 1.1 node.
It works as follows:
1) The just started 1.2 node quickly opens an OutboundTcpConnection toward a
1.1 node before receiving any messages from the latter.
2) Given the version is correctly detected only when the first message is
received, the version is momentarily set at 6.
3) This opens an OutboundTcpConnection from 1.2 to 1.1 at version 6, which gets
stuck in the connect() method.
Later, the version is correctly fixed, but all outbound connections from 1.2 to
1.1 are stuck at this point.
Evidence from 1.2 logs:
TRACE 13:48:31,133 Assuming current protocol version for /127.0.0.2
DEBUG 13:48:37,837 Setting version 5 for /127.0.0.2
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