We have seen cases with 0.8.1 when, under load, replication threads would hang up and not transfer data any longer. Restarting clears this.
I haven't found a way to monitor for this in a nice way, other than seeing partitions stay under-replicated for long periods of time. Sent from my BlackBerry 10 smartphone on the TELUS network. Original Message From: Gene Robichaux Sent: Tuesday, December 30, 2014 2:43 PM To: users@kafka.apache.org Reply To: users@kafka.apache.org Subject: RE: under replicated topics We restarted the Kafka brokers this morning. That fixed the issue. Gene Robichaux Manager, Database Operations Match.com 8300 Douglas Avenue I Suite 800 I Dallas, TX 75225 -----Original Message----- From: Allen Wang [mailto:aw...@netflix.com.INVALID] Sent: Tuesday, December 30, 2014 1:38 PM To: users@kafka.apache.org Subject: Re: under replicated topics Brokers may have temporary problems catching up with the leaders. So I would not worry about it if it happens only once a while and goes away. Occasionally we have seen under replicated topics for long time, which might be caused by ZooKeeper session problem as indicated by such log messages: [info] I wrote this conflicted ephemeral node [{"jmx_port":-1,"timestamp":" 1418688028517","host":"ec2-54-75-33-226.eu-west-1.compute.amazonaws.com ","version":1,"port":7101}] at /brokers/ids/0 a while back in a different session, hence I will backoff for this node to be deleted by Zookeeper and retry Typically restarting the Kafka process on such brokers will fix the problem. On Mon, Dec 29, 2014 at 12:49 PM, Gene Robichaux <gene.robich...@match.com> wrote: > My team is new to Kafka so any help is appreciated. > > We have a situation where we have 3 under replicated topics. What is > the best way to correct this? > > # bin/kafka-topics.sh --describe --under-replicated-partitions > --zookeeper > ServerName:2181 > Topic: DA_DbExceptionLog Partition: 8 Leader: 2 > Replicas: 3,2,4 Isr: 2,3 > Topic: DA_DebugLog Partition: 12 Leader: 1 Replicas: > 3,1,2 Isr: 1,2 > Topic: EC_Interaction Partition: 8 Leader: 2 Replicas: > 3,2,4 Isr: 2,3 > > Gene Robichaux > Manager, Database Operations > Match.com > 8300 Douglas Avenue I Suite 800 I Dallas, TX 75225 > >
