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From "Jason Brown (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-13115) Read repair is not blocking repair to finish in foreground repair
Date Thu, 19 Jan 2017 13:12:26 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-13115?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15829888#comment-15829888
] 

Jason Brown commented on CASSANDRA-13115:
-----------------------------------------

+1

> Read repair is not blocking repair to finish in foreground repair
> -----------------------------------------------------------------
>
>                 Key: CASSANDRA-13115
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-13115
>             Project: Cassandra
>          Issue Type: Bug
>         Environment: ccm on OSX 
>            Reporter: Xiaolong Jiang
>            Assignee: Sylvain Lebresne
>             Fix For: 3.0.x, 3.x
>
>
> The code trying to wait(block) for repair result to come back in 3.X is below:
> {code:title= DataResolver.java|borderStyle=solid}
> public void close()
>         {
>             try
>             {
>                 FBUtilities.waitOnFutures(repairResults, DatabaseDescriptor.getWriteRpcTimeout());
>             }
>             catch (TimeoutException ex)
>             {
>                 // We got all responses, but timed out while repairing
>                 int blockFor = consistency.blockFor(keyspace);
>                 if (Tracing.isTracing())
>                     Tracing.trace("Timed out while read-repairing after receiving all
{} data and digest responses", blockFor);
>                 else
>                     logger.debug("Timeout while read-repairing after receiving all {}
data and digest responses", blockFor);
>                 throw new ReadTimeoutException(consistency, blockFor-1, blockFor, true);
>             }
>         }
> {code}
> in DataResolver class, but this close method is never called and it's also not auto close(RepairMergeListener
is not extending from AutoCloseable/CloseableIterator) which means we never wait for repair
to finish before returning final result. 
> The steps to reproduce:
> 1. create some keyspace/table with RF = 2
> 2. start 2 nodes using ccm
> 3. stop node2
> 4. disable node1 hinted hand off
> 5. write some data to node1 with consistency level one
> 6. start node2
> 7. query some data from node1 
> This should trigger read repair. I put some log in above close method, and can not see
log print put.
> So this bug will basically violate "monotonic quorum reads " guarantee. 



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