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From "Aaron Morton (JIRA)" <>
Subject [jira] [Created] (CASSANDRA-2590) row delete breaks read repair
Date Mon, 02 May 2011 03:46:03 GMT
row delete breaks read repair 

                 Key: CASSANDRA-2590
             Project: Cassandra
          Issue Type: Bug
          Components: Core
    Affects Versions: 0.8 beta 1, 0.7.5
            Reporter: Aaron Morton
            Assignee: Aaron Morton
            Priority: Minor

related to CASSANDRA-2589 

Working at CL ALL can get inconsistent reads after row deletion. Reproduced on the 0.7 and
0.8 source. 

Steps to reproduce:

# two node cluster with rf 2 and HH turned off
# insert rows via cli 
# flush both nodes 
# shutdown node 1
# connect to node 2 via cli and delete one row
# bring up node 1
# connect to node 1 via cli and issue get with CL ALL 
# first get returns the deleted row, second get returns zero rows.

RowRepairResolver.resolveSuperSet() resolves a local CF with the old row columns, and the
remote CF which is marked for deletion. CF.resolve() does not pay attention to the deletion
flags and the resolved CF has both markedForDeletion set and a column with a lower timestamp.
The return from resolveSuperSet() is used as the return for the read without checking if the
cols are relevant. 

Also when RowRepairResolver.mabeScheduleRepairs() runs it sends two mutations. Node 1 is given
the row level deletation, and Node 2 is given a mutation to write the old (and now deleted)
column from node 2. I have some log traces for this if needed. 

A quick fix is to check for relevant columns in the RowRepairResolver, will attach shortly.

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