Is speculative retry enabled?

-- 
Jeff Jirsa


> On Oct 26, 2017, at 3:19 AM, Artur Siekielski <a...@vhex.net> wrote:
> 
> Hi,
> 
> we have one table for which reads and writes are done with CL=ONE. The table 
> contains counters. We wanted to disable async read repair for the table (to 
> lessen cluster load and to avoid DigestMismatchExceptions in debug.log). 
> After altering the table with read_repair_chance=0, 
> dclocal_read_repair_chance=0, the Digest exceptions still happen:
> 
> 
> DEBUG [ReadRepairStage:92] 2017-10-26 10:00:02,798 ReadCallback.java:242 - 
> Digest mismatch:
> org.apache.cassandra.service.DigestMismatchException: Mismatch for key 
> DecoratedKey(5238932067721150894, 7da6f64695d74899a91bd691321de534) 
> (33f950054869a91d1ea225eae342499a vs 70d054183b9b001de5f71139aa65b8d9)
>         at 
> org.apache.cassandra.service.DigestResolver.compareResponses(DigestResolver.java:92)
>  ~[apache-cassandra-3.11.1.jar:3.11.1]
>         at 
> org.apache.cassandra.service.ReadCallback$AsyncRepairRunner.run(ReadCallback.java:233)
>  ~[apache-cassandra-3.11.1.jar:3.11.1]
>         at 
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
>  [na:1.8.0_141]
>         at 
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
>  [na:1.8.0_141]
>         at 
> org.apache.cassandra.concurrent.NamedThreadFactory.lambda$threadLocalDeallocator$0(NamedThreadFactory.java:81)
>  [apache-cassandra-3.11.1.jar:3.11.1]
>         at java.lang.Thread.run(Thread.java:748) ~[na:1.8.0_141]
> 
> 
> I have verified that the DecoratedKey arguments are for a row from the 
> altered table (by checking token() of the partition key).
> 
> Shouldn't the settings disable AsyncRepairRunner for the table?
> 
> Is there an option to disable async read repair globally, or each table must 
> be altered?
> 
> Cassandra version: 3.11.1
> 
> 
> Thanks,
> Artur
> 
> 
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