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SOLR-17931: Fix getSolrClientCache() to leverage ObjectCache #3740

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SOLR-17931: Fix getSolrClientCache() to leverage ObjectCache #3740

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a30c56f
stab at where the SolrClientCache lives
epugh Oct 7, 2025
640f6b4
Merge remote-tracking branch 'upstream/main' into deprecation_removal…
epugh Oct 18, 2025
800fdc0
Migrate from coreContainer.getSolrClientCache to coreContainer.getDef…
epugh Oct 18, 2025
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23 changes: 13 additions & 10 deletions solr/core/src/java/org/apache/solr/core/CoreContainer.java
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Original file line number Diff line number Diff line change
Expand Up @@ -273,7 +273,7 @@ public JerseyAppHandlerCache getJerseyAppHandlerCache() {

protected MetricsHandler metricsHandler;

private volatile SolrClientCache solrClientCache;
// SolrClientCache is now stored in objectCache with key "solrClientCache"

private volatile Map<String, SolrCache<?, ?>> caches;

Expand Down Expand Up @@ -690,12 +690,15 @@ public FileStore getFileStore() {
* @see #getDefaultHttpSolrClient()
* @see ZkController#getSolrClient()
* @see Http2SolrClient#requestWithBaseUrl(String, String, SolrRequest)
* @deprecated likely to simply be moved to the ObjectCache so as to not be used
*/
@Deprecated
public SolrClientCache getSolrClientCache() {
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No; this misses the point. I don't like this method's existence; it's too tempting to use it when usually you shouldn't use it.

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Could you elaborate more on what the problem with this method is? Is there a more general approach that we are supposed to take for getting clients? at least to me, it appears super useful... If we we have a client created, great, use it, and if not, it creates it...

Only six classes call it, so if we want to eliminate it, it doesn't seem unsurmountable. Just unclear on what we would replace it with.

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If the javadocs don't already answer your question, I failed to make them clear enough. Let me flip this inquiry around... hey Eric, why do you think we need a cache of clients at all? Why cache them? What's wrong with our existing clients (linked to in javadocs)?

note: distributed file store usage could easily switch to coreContainer.getDefaultHttpSolrClient().requestWithBaseUrl

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okay, after re-reading and more context.. ( I sound like a LLM!) I think what you are saying is that we could replace most calls with one of:

   * @see #getDefaultHttpSolrClient()
   * @see ZkController#getSolrClient()
   * @see Http2SolrClient#requestWithBaseUrl(String, String, SolrRequest)

and that would work? I'll take a looksee at that.

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I'm also fine with the PR, TBH... enough callers of it want a SolrClientCache that it'd be annoying to outright remove it. And it's not a big deal if a plugin or something uses it when they could have used an alternative.

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so coreContainer.getDefaultHttpSolrClient().requestWithBaseUrl already is used in some places in DistribFileStore. However we do:

final var fileResponse = solrClient.requestWithBaseUrl(baseUrl, null, fileRequest);
        try (final var stream = fileResponse.getResponseStreamIfSuccessful()) {

can't quite figure that getResponseStreamIfSucessful to work yet

// TODO put in the objectCache instead
return solrClientCache;
return objectCache.computeIfAbsent(
"solrClientCache",
SolrClientCache.class,
k -> {
// Create a new SolrClientCache with the appropriate solrClientProvider
return new SolrClientCache(solrClientProvider.getSolrClient());
});
}

public ObjectCache getObjectCache() {
Expand Down Expand Up @@ -777,7 +780,8 @@ private void loadInternal() {
solrClientProvider =
new HttpSolrClientProvider(cfg.getUpdateShardHandlerConfig(), solrMetricsContext);
updateShardHandler.initializeMetrics(solrMetricsContext, "updateShardHandler");
solrClientCache = new SolrClientCache(solrClientProvider.getSolrClient());
// We don't pre-initialize SolrClientCache here anymore
// It will be created on-demand in getSolrClientCache() when first needed

Map<String, CacheConfig> cachesConfig = cfg.getCachesConfig();
if (cachesConfig.isEmpty()) {
Expand All @@ -799,7 +803,7 @@ private void loadInternal() {

zkSys.initZooKeeper(this, cfg.getCloudConfig());
if (isZooKeeperAware()) {
solrClientCache.setDefaultZKHost(getZkController().getZkServerAddress());
getSolrClientCache().setDefaultZKHost(getZkController().getZkServerAddress());
// initialize ZkClient metrics
zkSys.getZkMetricsProducer().initializeMetrics(solrMetricsContext, "zkClient");
pkiAuthenticationSecurityBuilder =
Expand Down Expand Up @@ -1306,9 +1310,8 @@ public void shutdown() {
} catch (Exception e) {
log.warn("Error shutting down CoreAdminHandler. Continuing to close CoreContainer.", e);
}
if (solrClientCache != null) {
solrClientCache.close();
}
// SolrClientCache is stored in objectCache with key "solrClientCache"
// and will be closed when objectCache is closed
if (containerPluginsRegistry != null) {
IOUtils.closeQuietly(containerPluginsRegistry);
}
Expand Down