[jira] [Updated] (CASSANDRA-15593) A possible read repair bug

["Alex Petrov (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/CASSANDRA-15593?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Alex Petrov updated CASSANDRA-15593:
------------------------------------
    Summary: A possible read repair bug  (was: seems reading repair bug)

> A possible read repair bug
> --------------------------
>
>                 Key: CASSANDRA-15593
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-15593
>             Project: Cassandra
>          Issue Type: Bug
>            Reporter: Antonio
>            Assignee: Alex Lumpov
>            Priority: Normal
>
> cassandra version：2.1.15
> i have one dc and 3nodes 
> 1. create KEYSPACE test WITH replication = \{'class': 'NetworkTopologyStrategy', 'DC1':'3' } and durable_writes = 'true';
> 2. create table test(a int , b int , c int , primary key(a)) with dclocal_read_repair_chance = 1.0;
> 3. insert one row into table test，instert into test(a, b, c) values (1, 1, 1); and remove sstable on two nodes and result below：
> {code}
>     node1：have correct row 1 1 1
>     node2：doesn't have rf
>     node3：doesn't have rf
> {code}
> 4. and i use local_one select one by one like this:
> {code}
>     node1 un，node2 dn，node3 dn：return 1 1 1
>     node1 dn，node2 un，node3 dn：return null
>     node1 dn，node2 dn，node3 dn：return null 
> {code}
>     this prove node1 have correct rf
> 5. and i let all node un，user local_quarum to select , select * from test where a = 1;
>     but the read repair does't work every time(i test many times)，that's the problem(same in 3.0.15)
>  
> i hope if i set dclocal_read_repair_chance = 1.0，every time i read by local_quarum， if any rf digest does't match，read repair will work，and repair all nodes
>  
> i.m not sure does's the problem happends in this code()
> wish for your reply，thanks
> {code}
> public void response(MessageIn<TMessage> message)
>     {
>         resolver.preprocess(message);        int n = waitingFor(message)
>               ? recievedUpdater.incrementAndGet(this)
>               : received;        if (n >= blockfor && resolver.isDataPresent())
>         {
>             ////this mean if return responses >= rf/2 +1 and a data response return，it start compare，does't all response
>             condition.signalAll();            // kick off a background digest comparison if this is a result that (may have) arrived after            // the original resolve that get() kicks off as soon as the condition is signaled            if (blockfor < endpoints.size() && n == endpoints.size())
>             {
>                 TraceState traceState = Tracing.instance.get();                if (traceState != null)
>                     traceState.trace("Initiating read-repair");
>                 StageManager.getStage(Stage.READ_REPAIR).execute(new AsyncRepairRunner(traceState));
>             }
>         }
>     }
> {code}



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