Hi Victoria, There are no metrics of when a config was changed. However, if you've been capturing the JMX metrics from the brokers, the metric kafka.cluster:name=ReplicasCount,partition=*,topic=*,type=Partition would show if replication factor was increased.
As for retention time, if you're sure that there's not been an increase in data ingestion, best metric to look into for that is kafka.log:name=LogSegments... as an increase in that would either be caused by a large influx of data or an increase in retention time. Lastly, check the logs and metrics for the log cleaner, in case there's any issues occurring preventing logs from being cleaned. kafka.log:name=max-clean-time-secs,type=LogCleaner and kafka.log:name=time-since-last-run-ms,type=LogCleanerManager would be most useful here. The ZK logs won't be much use (ZK being where the config is stored) unless you had audit logging enabled, which is disabled by default. Good luck, Liam Clarke-Hutchinson On Tue, 2 Jun. 2020, 8:50 pm Victoria Zuberman, < victoria.zuber...@imperva.com> wrote: > Regards kafka-logs directory, it was an interesting lead, we checked and > it is the same. > > Regards replication factor and retention, I am not looking for current > information, I am look for metrics that can give me information about a > change. > > Still looking for more ideas > > On 02/06/2020, 11:31, "Peter Bukowinski" <pmb...@gmail.com> wrote: > > CAUTION: This message was sent from outside the company. Do not click > links or open attachments unless you recognize the sender and know the > content is safe. > > > > On Jun 2, 2020, at 12:56 AM, Victoria Zuberman < > victoria.zuber...@imperva.com> wrote: > > > > Hi, > > > > Background: > > Kafka cluster > > 7 brokers, with 4T disk each > > version 2.3 (recently upgraded from 0.1.0 via 1.0.1) > > > > Problem: > > Used disk space went from 40% to 80%. > > Looking for root cause. > > > > Suspects: > > > > 1. Incoming traffic > > > > Ruled out, according to metrics no significant change in “bytes in” > for topics in cluster > > > > 1. Upgrade > > > > The raise started on the day of upgrade to 2.3 > > > > But we upgraded another cluster in the same way and we don’t see > similar issue there > > > > Is there a known change or issue at 2.3 related to disk space usage? > > > > 1. Replication factor > > > > Is there a way to see whether replication factor of any topic was > changed recently? Didn’t find in metrics... > > You can use the kafka-topics.sh script to check the replica count for > all your topics. Upgrading would not have affected the replica count, > though. > > > 1. Retention > > > > Is there a way to see whether retention was changed recently? Didn’t > find in metrics... > > You can use kafka-topics.sh —-zookeeper host:2181 --describe > --topics-with-overrides > to list any topics with non-default retention, but I’m guessing that’s > not it. > > If your disk usage went from 40 to 80% on all brokers — effectively > doubled — it could be that your kafka data log directory path(s) changed > during the upgrade. As you upgraded each broker and (re)started the kafka, > it would have left the existing data under the old one path and created new > topic partition directories and logs under the new path as it rejoined the > cluster. Have you verified that your data log directory locations are the > same as they used to be? > > > Would appreciate any other ideas or investigation leads > > > > Thanks, > > Victoria > > > > ------------------------------------------- > > NOTICE: > > This email and all attachments are confidential, may be proprietary, > and may be privileged or otherwise protected from disclosure. They are > intended solely for the individual or entity to whom the email is > addressed. However, mistakes sometimes happen in addressing emails. If you > believe that you are not an intended recipient, please stop reading > immediately. Do not copy, forward, or rely on the contents in any way. > Notify the sender and/or Imperva, Inc. by telephone at +1 (650) 832-6006 > and then delete or destroy any copy of this email and its attachments. The > sender reserves and asserts all rights to confidentiality, as well as any > privileges that may apply. Any disclosure, copying, distribution or action > taken or omitted to be taken by an unintended recipient in reliance on this > message is prohibited and may be unlawful. > > Please consider the environment before printing this email. > > >
