dsmiley commented on code in PR #2611:
URL: https://github.com/apache/solr/pull/2611#discussion_r1706392465
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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:
If you want.
But I think the best solution reflecting the pattern/need for this cache
cleaner is a ScheduledExecutorService and no extra state var. all
ExecutorService's *have* state or could use null.
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