Kafka: Can the number of partitions (per topic) be changed after creation?

[#1]

The Kafka documentation states we can’t reduce the number of partitions per topic once created. Can we then increase them or is it a documentation mistake? If we are allowed to add new partitions and use keys to get our messages wouldn’t the old messages be unreachable?

[#2]

Yes , you can increase the number of partitions using the topic script. Please see https://cwiki.apache.org/confluence/display/KAFKA/Replication+tools#Replicationtools-5.AddPartitionT...

[#3]

@pbrahmbhatt

How can we set default partition size for dynamically created topics?

[#4]

set num.partition=x in the server.properties