aparnasuresh85 commented on code in PR #2611:
URL: https://github.com/apache/solr/pull/2611#discussion_r1707659461
##########
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:
I tried this. Using the following code, where cacheCleanerExecutor is
defined as
```
private final ScheduledExecutorService cacheCleanerExecutor =
Executors.newSingleThreadScheduledExecutor(new
SolrNamedThreadFactory("cacheCleaner"));
```:
and then used in `fetchCollectionProperties()` as follows:
```
if (cacheCleanerExecutor.isShutdown()) {
synchronized (this) {
if (cacheCleanerExecutor.isShutdown()) {
cacheCleanerExecutor.scheduleAtFixedRate(new CacheCleaner(), 0, 1,
TimeUnit.MINUTES);
}
}
}
```
I ran a Junit test and set a breakpoint at
`cacheCleanerExecutor.scheduleAtFixedRate`, it is never hit.
But when I changed to using a state variable like the following, I see the
breakpoint being hit to schedule the cacheCleaner thread
```
if (collectionPropsCacheCleanerInitialized.compareAndSet(false, true)) {
synchronized (this) {
cacheCleanerExecutor.scheduleAtFixedRate(new CacheCleaner(), 0, 1,
TimeUnit.MINUTES);
}
}
```
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