[jira] [Resolved] (CASSANDRA-12947) Repair not replicating data

["Jeremiah Jordan (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/CASSANDRA-12947?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jeremiah Jordan resolved CASSANDRA-12947.
-----------------------------------------
       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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