> topics are all caught up, but I have one high volume topic (around > 40K msgs/sec) that is taking much longer. I just took a few samples > of Replica-MaxLag to see how long it would take to catch up. > Currently, it is behind about 12.5 million messages and is catching > up at a rate of about 1600 msgs/sec. At that rate, it’ll take > around 9 days before the replica is caught up to the leader. > > Is there any way to speed this up?
During the period your high-volume topic is under-replicated you can temporarily try one or both of the following: - Increasing num.replica.fetchers (defaults is one) - If you don't have too many topic-partitions you can also increase replica.fetch.max.bytes. > Or, alternatively, I don’t actually care about this topic’s > history. It is a new topic, and I know that it doesn't yet have any > consumers. I’d be fine with instructing both brokers to drop > old logs and just start from the top of the log. I could do this by > manually deleting the topic (kafka data files and in zookeeper), but > to do so properly with 0.8.0 I think I’d have to shut down the > whole cluster, correct? I’d rather not do this, as another > topic does have a consumer and I don’t want to lose messages for > it. Right - or you could do a rolling bounce and change the retention settings (http://kafka.apache.org/documentation.html#brokerconfigs) of that topic to something low so it gets expired and then do another rolling bounce to remove the override. -- Joel
