Jason Harvey created CASSANDRA-14918:
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Summary: multiget_slice returning inconsistent results when
performed with CL higher than ONE
Key: CASSANDRA-14918
URL: https://issues.apache.org/jira/browse/CASSANDRA-14918
Project: Cassandra
Issue Type: Bug
Environment: 9 node ring, cassandra 3.11.2.
Ring is not upgraded from any previous version.
Reporter: Jason Harvey
I'm on cassandra 3.11.2. On a number of CFs I'm observing that multiget_slice
sometimes returns inconsistent, partially-empty results for the exact same
request, despite the underlying data not changing. This behaviour is only
observed when I perform the multiget with a CL higher than `ONE` - all `ONE`
requests work as expected.
I was able to create a test table in a lab environment and after fiddling with
the data enough was able to repro. I was unable to perform a very basic repro
with only a few rows present. To repro, I inserted a couple million rows,
deleted a subset of those rows, and the performed a multiget slice on a list of
partitions which included living and deleted partitions. The result is that
sometimes, when performing a multiget on this data, I get a thrift struct back
with partition info, but no column names or values - the thrift LIST that is
generated contains 0 elements.
The repro case described above is rather meandering so I'm working to break it
down into a simple of a case as I can. It is unclear if deletions need to occur
to reproduce this or not.
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