dsmiley commented on code in PR #2611:
URL: https://github.com/apache/solr/pull/2611#discussion_r1707774326
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solr/solrj-zookeeper/src/java/org/apache/solr/common/cloud/CollectionPropertiesZkStateReader.java:
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@@ -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.
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