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From Shaun Senecal <shaun.sene...@lithium.com>
Subject Shrinking ISR with no load on brokers or incoming messages
Date Fri, 02 Oct 2015 01:09:30 GMT
Hi


I have noticed that when our brokers have no incoming connections (just connections to other
brokers and to the ZK cluster) we get messages about shrinking the ISR for some partitions


[2015-10-02 00:58:31,239] INFO Partition [lia.stage.raw_events,9] on broker 1: Shrinking ISR
for partition [lia.stage.raw_events,9] from 1,0,2 to 1 (kafka.cluster.Partition)

...

[2015-10-02 00:58:31,335] INFO Partition [lia.stage.raw_events,9] on broker 1: Expanding ISR
for partition [lia.stage.raw_events,9] from 1 to 1,0 (kafka.cluster.Partition)

[2015-10-02 00:58:31,430] INFO Partition [lia.stage.raw_events,9] on broker 1: Expanding ISR
for partition [lia.stage.raw_events,9] from 1,0 to 1,0,2 (kafka.cluster.Partition)


It seems weird to me that the ISR would ever change when there is no load on the brokers and
no incoming messages at all.  Does this indicate a problem with the cluster, or is this normal?




Thanks


Shaun

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