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https://issues.apache.org/jira/browse/CASSANDRA-12947?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jeremiah Jordan resolved CASSANDRA-12947.
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Resolution: Not A Problem
Fix Version/s: (was: 3.x)
> Repair not replicating data
> ---------------------------
>
> Key: CASSANDRA-12947
> URL: https://issues.apache.org/jira/browse/CASSANDRA-12947
> Project: Cassandra
> Issue Type: Bug
> Environment: Cassandra 3.7
> Single DC
> 7 Nodes
> RF 3
> NetworkTopologyStrategy
> OS: Ubuntu
> Reporter: Malte Pickhan
>
> We experienced strange behaviour of our C* cluster last week.
> In the logs we've seen multiple requests in the logs where we the values read
> from Cassandra actually have been 'null'.
> When running the query on a node, we sometimes received the result and
> sometimes not.
> When setting the CL to LOCAL_QUORUM everything was fine. So far nothing
> unusual, probably the dataset wasn't replicated to one of the nodes.
> When turning on the tracing and running the query there was following
> intersting line:
> {quote}
> Initiating read-repair [SharedPool-Worker-2] | 2016-11-18 10:17:47.528000 |
> $PUBLIC_IP | 126 | 127.0.0.1
> Digest mismatch: org.apache.cassandra.service.DigestMismatchException:
> Mismatch for key DecoratedKey(-5887526567589486157,
> 3130333031303338383436303937) (db1e86d507513ff12ba95f0eff984b60 vs
> d41d8cd98f00b204e9800998ecf8427e) [ReadRepairStage:1]
> {quote}
> This is probably related to CASSANDRA-12090?
> The interesting part is, after that we've run a 'nodetool repair -pr', after
> that the behaviour was still the same and the data randomly not available,
> depending on which node was hit.
> Only after running a 'nodetool repair -pr -full' the issue was gone.
> Did we miss something here? The point that's bothering me is that the dataset
> was not replicated.
> Worth to note is probably that some weeks ago we've hit the bug
> CASSANDRA-12694 and fixed it by scrubbing some tables.
> Any hints/help are appreciated.
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