[jira] [Created] (CASSANDRA-14918) multiget_slice returning inconsistent results when performed with CL higher than ONE

["Jason Harvey (JIRA)" <ji...@apache.org>]

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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