Alex Petrov created CASSANDRA-12956:
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             Summary: CL is not replayed on custom 2i exception
                 Key: CASSANDRA-12956
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-12956
             Project: Cassandra
          Issue Type: Bug
            Reporter: Alex Petrov
            Priority: Critical


If during the node shutdown / drain the custom (non-cf) 2i throws an exception, 
CommitLog will get correctly preserved (segments won't get discarded because 
segment tracking is correct). 

However, when it gets replayed on node startup,  we're making a decision 
whether or not to replay the commit log. CL segment starts getting replayed, 
since there are non-discarded segments and during this process we're checking 
whether there every [individual 
mutation|https://github.com/apache/cassandra/blob/trunk/src/java/org/apache/cassandra/db/commitlog/CommitLogReplayer.java#L215]
 in commit log is already committed or no. Information about the sstables is 
taken from [live sstables on 
disk|https://github.com/apache/cassandra/blob/trunk/src/java/org/apache/cassandra/db/commitlog/CommitLogReplayer.java#L250-L256].

There's one more somewhat related issue 
[CASSANDRA-9669|https://issues.apache.org/jira/browse/CASSANDRA-9669], although 
it looks that similar behaviour was possible before that issue as well.



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