Cheng Wang created CASSANDRA-17875:
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Summary: Filter out NULL tokens entries from the peers table
Key: CASSANDRA-17875
URL: https://issues.apache.org/jira/browse/CASSANDRA-17875
Project: Cassandra
Issue Type: Bug
Reporter: Cheng Wang
Assignee: Cheng Wang
Similar to the issue reported in
[CASSANDRA-16518|https://issues.apache.org/jira/browse/CASSANDRA-16518].
https://issues.apache.org/jira/browse/CASSANDRA-15193 adds a check for node
version, which reverts the protocol version to V3 if any peer fails the version
check. However, the version check should only consider the node which is
already joined, i.e., the tokens entry should not be NULL.
CASSANDRA-16518 fixed the issue by filtering out the NULL release_version
entries, which doesn't solve the problem for all the cases. In our test case,
we see rows in the system.peers table with non-null release_version (although
it's obsolete entry) but the tokens are NULL.
We should filter out the NULL tokens entries as well.
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