Christian Spriegel created CASSANDRA-14480:
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Summary: Digest mismatch requires all replicas to be responsive
Key: CASSANDRA-14480
URL: https://issues.apache.org/jira/browse/CASSANDRA-14480
Project: Cassandra
Issue Type: Bug
Components: Core
Reporter: Christian Spriegel
I ran across a scenario where a digest mismatch causes a read-repair that
requires all up nodes to be able to respond. If one of these nodes is not
responding, then the read-repair is being reported to the client as
ReadTimeoutException.
My expection would be that a CL=QUORUM will always succeed as long as 2 nodes
are responding. But unfortunetaly the third node being "up" in the ring, but
not being able to respond does lead to a RTE.
I came up with a scenario that reproduces the issue:
# set up a 3 node cluster using ccm
# increase the phi_convict_threshold to 16, so that nodes are permanently
reported as up
# create attached schema
# run attached reader&writer (which only connects to node1&2). This should
already produce digest mismatches
# do a "ccm node3 pause"
# The reader will report a read-timeout with consistency QUORUM (2 responses
were required but only 1 replica responded). Within the DigestMismatchException
catch-block it can be seen that the repairHandler is waiting for 3 responses,
even though the exception says that 2 responses are required.
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