-[jira] [Commented] (KAFKA-691) Fault tolerance broken with replication factor 1
"Jun Rao 2013-01-14, 01:01
[ https://issues.apache.org/jira/browse/KAFKA-691?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13552371#comment-13552371 ]
Jun Rao commented on KAFKA-691:
That's a good point. Increasing the timeout will work for most cases. If a broker goes down, the client request will get a socket exception immediately, independent of the timeout. So setting a large timeout doesn't hurt. When the broker host goes down and the client is waiting for a response from the server, I think the client will have to wait until the timeout. If we set a larger timeout, it means that the client has to wait longer before realizing the broker is down. However, since this is a rarer case, I think setting a larger timeout for now is probably good enough.
> 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
> Assignee: Maxime Brugidou
> Fix For: 0.8
> Attachments: KAFKA-691-v1.patch, KAFKA-691-v2.patch
> 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.
This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators
For more information on JIRA, see: http://www.atlassian.com/software/jira