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From "Carl Yeksigian (JIRA)" <>
Subject [jira] [Commented] (CASSANDRA-10779) - Uncaught exception on thread Thread
Date Fri, 18 Dec 2015 19:52:46 GMT


Carl Yeksigian commented on CASSANDRA-10779:

I think there is a different issue lurking here, which is that we are responding to mutations
early on the replicas if we don't acquire the lock right away. We are returning early from
the {{mutation.apply}} call because we were unable to acquire the lock, but in the {{MutationVerbHandler}},
we're only don't reply in the case we get a WTE (which only happens in the MV path).

The reason we changed this to put itself back on the queue when it was unable to acquire the
lock was that we would otherwise be blocking other mutations that are waiting, especially
the coordinator batchlog mutations. Since we aren't doing the coordinator batchlog, it might
be best to just switch back to waiting for the lock synchronously. The other option would
be to include a callback function with the mutation to run on success/failure.

I'm currently testing the impact of changing this to acquiring the lock synchronously; I'll
also look into the amount of change required to add callback functions.

> - Uncaught exception on thread Thread
> ----------------------------------------------------------------------------------
>                 Key: CASSANDRA-10779
>                 URL:
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Coordination
>         Environment: Windows 7 64-bit, Cassandra v3.0.0, Java 1.8u60
>            Reporter: Will Zhang
>            Assignee: Carl Yeksigian
>             Fix For: 3.0.x
> Hi guys,
> I encountered the following warning message when I was testing to upgrade from v2.2.2
to v3.0.0. 
> It looks like a write time-out but in an uncaught exception. Could this be an easy fix?
> Log file section below. Thank you!
> {code}
> 	WARN  [SharedPool-Worker-64] 2015-11-26 14:04:24,678
- Uncaught exception on thread Thread[SharedPool-Worker-64,10,main]: {}
> org.apache.cassandra.exceptions.WriteTimeoutException: Operation timed out - received
only 0 responses.
> 		at org.apache.cassandra.db.Keyspace.apply( ~[apache-cassandra-3.0.0.jar:3.0.0]
> 		at org.apache.cassandra.db.Keyspace.apply( ~[apache-cassandra-3.0.0.jar:3.0.0]
> 		at org.apache.cassandra.db.Mutation.apply( ~[apache-cassandra-3.0.0.jar:3.0.0]
> 		at org.apache.cassandra.db.Keyspace.lambda$apply$59( ~[apache-cassandra-3.0.0.jar:3.0.0]
> 		at java.util.concurrent.Executors$ ~[na:1.8.0_60]
> 		at org.apache.cassandra.concurrent.AbstractTracingAwareExecutorService$
> 		at [apache-cassandra-3.0.0.jar:3.0.0]
> 		at [na:1.8.0_60]
> 	INFO  [IndexSummaryManager:1] 2015-11-26 14:41:10,527 -
Redistributing index summaries
> {code}

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