Affects Version/s: 6.6
Fix Version/s: None
I am not sure where to start with this one.
I tried to post this already on the mailing list: https://mail-archives.apache.org/mod_mbox/lucene-solr-user/201708.mbox/%3c48C49426-33A2-4D79-AE26-A4515B8F834E@gmail.com%3e
In short: the usage of a SynchronousQueue as the workQeue prevents more tasks than max threads.
For example, taken from OverseerCollectionMessageHandler:
This Executor is used when doing a REPLACENODE (= ADDREPLICA) command. When the node has more than 10 collections this will fail with the mentioned java.util.concurrent.RejectedExecutionException.
I am also not sure how to fix this. Just replacing the queue with a different implementation feels wrong to me or could cause unwanted side behaviour.