https://community.cloudera.com/t5/Support-Questions/Kafka-Shrinking-Expanding-ISR-for-partition-TOPIC/m-p/116371#M79165 <A rel="user" href="https://community.cloudera.com/users/2547/muanang.html" nodeid="2547">@Michael Dennis Uanang</A><P>You have to see this </P><P><A href="https://kafka.apache.org/082/ops.html" target="_blank">https://kafka.apache.org/082/ops.html</A></P><TABLE><TBODY><TR><TD>ISR shrink rate</TD><TD>kafka.server:type=ReplicaManager,name=IsrShrinksPerSec</TD><TD>If a broker goes down, ISR for some of the partitions will shrink. When that broker is up again, ISR will be expanded once the replicas are fully caught up. Other than that, the expected value for both ISR shrink rate and expansion rate is 0.</TD></TR></TBODY></TABLE> Sat, 12 Mar 2016 19:14:41 GMT nsabharwal 2016-03-12T19:14:41Z