gus-asf commented on code in PR #2379:
URL: https://github.com/apache/solr/pull/2379#discussion_r1560189150
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solr/core/src/java/org/apache/solr/handler/component/HttpShardHandler.java:
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@@ -140,58 +150,64 @@ public void submit(
srsp.setShard(shard);
SimpleSolrResponse ssr = new SimpleSolrResponse();
srsp.setSolrResponse(ssr);
+ synchronized (RESPONSE_CANCELABLE_LOCK) {
+ pending.incrementAndGet();
+ // if there are no shards available for a slice, urls.size()==0
+ if (urls.isEmpty()) {
+ // TODO: what's the right error code here? We should use the same
thing when
+ // all of the servers for a shard are down.
+ SolrException exception =
+ new SolrException(
+ SolrException.ErrorCode.SERVICE_UNAVAILABLE, "no servers
hosting shard: " + shard);
+ srsp.setException(exception);
+ srsp.setResponseCode(exception.code());
+ responses.add(srsp);
+ return;
+ }
- pending.incrementAndGet();
- // if there are no shards available for a slice, urls.size()==0
- if (urls.isEmpty()) {
- // TODO: what's the right error code here? We should use the same thing
when
- // all of the servers for a shard are down.
- SolrException exception =
- new SolrException(
- SolrException.ErrorCode.SERVICE_UNAVAILABLE, "no servers hosting
shard: " + shard);
- srsp.setException(exception);
- srsp.setResponseCode(exception.code());
- responses.add(srsp);
- return;
- }
+ // all variables that set inside this listener must be at least volatile
+ responseCancellableMap.put(
Review Comment:
I didn't feel comfortable with that solution because this map is updated
while looping on an Atomic integer `pending` and also is updated immediately
after `responses.take()` all of which appear to need to happen as a unit. The
prior code wasn't touching it from the child threads, but since I'm changing
that I want to be sure that all of these operations happen as a unit to avoid
potentially weird cases where the loop fails to exit but then the map is empty
etc...
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