Jay Kreps created KAFKA-691:
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Summary: Fault tolerance broken with replication factor 1
Key: KAFKA-691
URL: https://issues.apache.org/jira/browse/KAFKA-691
Project: Kafka
Issue Type: Bug
Affects Versions: 0.8
Reporter: Jay Kreps
In 0.7 if a partition was down we would just send the message elsewhere. This
meant that the partitioning was really more of a "stickiness" then a hard
guarantee. This made it impossible to depend on it for partitioned, stateful
processing.
In 0.8 when running with replication this should not be a problem generally as
the partitions are now highly available and fail over to other replicas.
However in the case of replication factor = 1 no longer really works for most
cases as now a dead broker will give errors for that broker.
I am not sure of the best fix. Intuitively I think this is something that
should be handled by the Partitioner interface. However currently the
partitioner has no knowledge of which nodes are available. So you could use a
random partitioner, but that would keep going back to the down node.
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