You can enable unclean.leader.election temporarily for specific topic by using kafka-topics.sh command. This requires broker restart to take effect.
http://kafka.apache.org/documentation/#topicconfigs On Thu, Jun 28, 2018 at 2:27 AM Jordan Pilat <jrpi...@gmail.com> wrote: > Heya, > > I had a question about what behavior to expect from a particular > scenario. Given: > A. Unclean leader elections are disabled > B. A partition is led by Broker1 and followed by Broker2 > C. Broker1 is on offset 100 > D. Broker2 is on offset 90 > E. Broker2 has fallen out of the ISR, leaving only Broker1 in the ISR > F. Broker1 has a hard drive failure and goes down. All messages for the > partition in question are permanently lost. > > _As I understand it_, the only way for the partition to come back online > is to bring Broker1 back online, and suffer the loss of 100 messages (as > Broker2's log will be truncated to Broker1's offset, which will start from > scratch due to the hard drive loss) > > Is there a procedure in such a case, to force-elect Broker2 the leader, > and thus only lose 10 messages? > > Thanks! > - Jordan Pilat >
