Jeremy Justus created CASSANDRA-15199:
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Summary: Cassandra throwing occasional NPE 3.11.x
Key: CASSANDRA-15199
URL: https://issues.apache.org/jira/browse/CASSANDRA-15199
Project: Cassandra
Issue Type: Bug
Reporter: Jeremy Justus
Hey folks, decided to raise an official Jira(never done one of these before)
about an issue we have found between Kong API Gateway leveraging Cassandra as
our db.
We run a C* cluster in 2 close DCs, 6 C* nodes total, 3 in each DC. Data
replicated across all nodes. We have found C* sometimes throws NPEs based on
the calls made by the lua-cassandra driver Kong
leverages([https://github.com/thibaultcha/lua-cassandra]). Very specifically it
seems to occur when attempting to do paging across multiple C* nodes. When
persistently paging to a single C* node we can't reproduce NPEs in C*.
The exact Error C* throws with its stack-trace can be seen here:
[https://github.com/Kong/kong/issues/4194#issuecomment-497572751]
And again when we tried to upgrade from 3.11.2 to 3.11.4 in hopes it was
already resolved:
[https://github.com/Kong/kong/issues/4194#issuecomment-497590235]
Same error same line numbers, so code must be same in this portion.
Sample of our C* Config:
[https://github.com/Kong/kong/issues/4194#issuecomment-497595766]
We discussed this in the ASF Slack flow as well:
ASF Slack discussion
([https://the-asf.slack.com/archives/CJZLTM05A/p1559321422028200] )
Some of the more important technical comments I saw people posting here:
[https://github.com/Kong/kong/issues/4194#issuecomment-497858824]
I am not a C* DBA so I don't have an exact repro for you other than stating
what the client application was attempting to do(Paging across multiple C*
nodes within a DC) when we could see the failures. Any Apache C* folk think
they see the issue or could drop me C* JAR with extra debugging print
statements I could run in dev to help feed you more info? Or if you see the
problem and can one shot a fix so no more NPE and Cassandra responds
appropriately to the client with some sort of error message around what was
wrong that would be helpful.
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