Richard Low created CASSANDRA-9641:
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Summary: Occasional timeouts with blockFor=all for LOCAL_QUORUM
query
Key: CASSANDRA-9641
URL: https://issues.apache.org/jira/browse/CASSANDRA-9641
Project: Cassandra
Issue Type: Bug
Components: Core
Reporter: Richard Low
We have a keyspace using NetworkTopologyStrategy with options DC1:3, DC2:3. Our
tables have
read_repair_chance = 0.0
dclocal_read_repair_chance = 0.1
speculative_retry = ’99.0PERCENTILE'
and all reads are at LOCAL_QUORUM. On 2.0.11, we occasionally see this timeout:
Cassandra timeout during read query at consistency ALL (6 responses were
required but only 5 replica responded)
(sometimes only 4 respond). The ALL is probably due to CASSANDRA-7947 if this
occurs during a digest mismatch, but what is interesting is it is expecting 6
responses i.e. blockFor is set to all replicas. I can’t see how this should
happen. From the code it should never set blockFor to more than 4 (although 4
is still wrong - I'll make a separate JIRA for that).
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