dsmiley commented on code in PR #2611: URL: https://github.com/apache/solr/pull/2611#discussion_r1707774326
########## solr/solrj-zookeeper/src/java/org/apache/solr/common/cloud/CollectionPropertiesZkStateReader.java: ########## @@ -300,10 +313,11 @@ private VersionedCollectionProps fetchCollectionProperties(String collection, Wa throws KeeperException, InterruptedException { final String znodePath = getCollectionPropsPath(collection); // lazy init cache cleaner once we know someone is using collection properties. - if (collectionPropsCacheCleaner == null) { - synchronized (zkStateReader.getUpdateLock()) { // Double-checked locking - if (collectionPropsCacheCleaner == null) { - collectionPropsCacheCleaner = notifications.submit(new CacheCleaner()); + if (cacheCleanerThread == null) { + synchronized (this) { + if (cacheCleanerThread == null) { Review Comment: fetchCollectionProperties: need to know if there is a task in the executor or not. If we use the ScheduledThreadPoolExecutor type, then we have methods like `getTaskCount` to know if something is scheduled. An alternative (maybe simpler?) is to use Timer. Wether the ScheduledExecutor or Timer, could also use a null instance initially (not final, of course) to differentiate not-started from started which is totally fine too. -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: issues-unsubscr...@solr.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org --------------------------------------------------------------------- To unsubscribe, e-mail: issues-unsubscr...@solr.apache.org For additional commands, e-mail: issues-h...@solr.apache.org