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https://issues.apache.org/jira/browse/CASSANDRA-10779?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15115679#comment-15115679
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T Jake Luciani commented on CASSANDRA-10779:
--------------------------------------------
I'm trying to explain the reason for non-blocking the Mutation stage. For
example this patch would block all non-mv mutations (including system
keyspaces) if we encounter (write stage pool size MV writes on the same lock).
If we decide to go with the non completable future approach then I would
suggest we reintroduce the MV Write stage. So we don't block non MV mutations.
> Mutations do not block for completion under view lock contention
> ----------------------------------------------------------------
>
> Key: CASSANDRA-10779
> URL: https://issues.apache.org/jira/browse/CASSANDRA-10779
> Project: Cassandra
> Issue Type: Bug
> Components: Local Write-Read Paths
> Environment: Windows 7 64-bit, Cassandra v3.0.0, Java 1.8u60
> Reporter: Will Zhang
> Assignee: Tyler Hobbs
> Fix For: 3.0.x, 3.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
> AbstractTracingAwareExecutorService.java:169 - 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(Keyspace.java:427)
> ~[apache-cassandra-3.0.0.jar:3.0.0]
> at org.apache.cassandra.db.Keyspace.apply(Keyspace.java:386)
> ~[apache-cassandra-3.0.0.jar:3.0.0]
> at org.apache.cassandra.db.Mutation.apply(Mutation.java:205)
> ~[apache-cassandra-3.0.0.jar:3.0.0]
> at
> org.apache.cassandra.db.Keyspace.lambda$apply$59(Keyspace.java:435)
> ~[apache-cassandra-3.0.0.jar:3.0.0]
> at
> java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
> ~[na:1.8.0_60]
> at
> org.apache.cassandra.concurrent.AbstractTracingAwareExecutorService$FutureTask.run(AbstractTracingAwareExecutorService.java:164)
> ~[apache-cassandra-3.0.0.jar:3.0.0]
> at
> org.apache.cassandra.concurrent.SEPWorker.run(SEPWorker.java:105)
> [apache-cassandra-3.0.0.jar:3.0.0]
> at java.lang.Thread.run(Thread.java:745) [na:1.8.0_60]
> INFO [IndexSummaryManager:1] 2015-11-26 14:41:10,527
> IndexSummaryManager.java:257 - Redistributing index summaries
> {code}
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