[jira] [Created] (CASSANDRA-11905) Index building fails to start CFS.readOrdering when reading

[Sylvain Lebresne (JIRA)]

Sylvain Lebresne created CASSANDRA-11905:
--------------------------------------------

             Summary: Index building fails to start CFS.readOrdering when 
reading
                 Key: CASSANDRA-11905
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-11905
             Project: Cassandra
          Issue Type: Bug
            Reporter: Sylvain Lebresne
            Assignee: Sylvain Lebresne
            Priority: Critical
             Fix For: 3.0.x, 3.x


This code for indexing partition when building index in 3.0 is:
{noformat}
SinglePartitionReadCommand cmd = 
SinglePartitionReadCommand.fullPartitionRead(cfs.metadata, 
FBUtilities.nowInSeconds(), key);

try (OpOrder.Group opGroup = cfs.keyspace.writeOrder.start();
      UnfilteredRowIterator partition = cmd.queryMemtableAndDisk(cfs, opGroup))
{
    cfs.indexManager.indexPartition(partition, opGroup, indexes, 
cmd.nowInSec());
}
{noformat}
which is clearly incorrect as the {{OpOrder}} that {{queryMemtableAndDisk}} 
expects is the one from {{cfs.readOrdering}}, not the one for writes on the 
keyspace.
This wasn't a problem prior to 3.0 as the similar code was using the pager, 
which ended up properly taking the read {{OpOrder}} internally but I messed 
this up in CASSANDRA-8099.

Thanks to [~Stefania] for pointing that out.



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