Kasper Svendsen created CASSANDRA-14887:
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Summary: Incorrect number of acknowlegments in
WriteTimeoutException message for EACH_QUORUM writes
Key: CASSANDRA-14887
URL: https://issues.apache.org/jira/browse/CASSANDRA-14887
Project: Cassandra
Issue Type: Bug
Reporter: Kasper Svendsen
Since EACH_QUORUM writes require a certain number of acknowledgements from
nodes in each DC and WriteTimeoutException only reports on the total number of
acknowledgements received, the message can be misleading. Furthermore, if the
total number of acknowledgements exceeds or equals the total number of required
acknowledgements, which can happen with EACH_QUORUM writes, the number of
acknowledgements is changed to required - 1 ({color:#333333}lines 102-103,
https://github.com/apache/cassandra/blob/cassandra-3.11/src/java/org/apache/cassandra/service/AbstractWriteResponseHandler.java){color},
which is incorrect.
Consider a 2 DC cluster with 5 nodes in each cluster and a replication factor
of 3 in each cluster (for the relevant keyspace). A write at consistency level
EACH_QUORUM might receive acknowledments from 3 nodes in one DC and 1 node from
the other DC before timing out.
Then the WriteTimeoutException message will specify that it received 3
acknowledments out of 4 required, which is incorrect and misleading.
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