risdenk commented on issue #553: SOLR-9515: Update to Hadoop 3 URL: https://github.com/apache/lucene-solr/pull/553#issuecomment-459745591 Well naively adding shutdown of the thread pool results in a lot of `RejectedExecutionException`s since the pool is static. Shutting down is per the lifetime of one BlockPoolSlice. The lifetime of the Hadoop `addReplicaThreadPool` needs some more thought. I don't know if it is completely possible to fix this only in BlockPoolSlice. Planning to leave it for now as a bad thread.
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