justinrsweeney commented on code in PR #1585: URL: https://github.com/apache/solr/pull/1585#discussion_r1205796738
########## solr/solrj-zookeeper/src/java/org/apache/solr/common/cloud/ZkStateReader.java: ########## @@ -326,14 +326,14 @@ private boolean updateDocCollection(String collection, DocCollection newState) { log.debug("Removing cached collection state for [{}]", collection); watch.currentState = null; } else { // both new and old states are non-null - int oldCVersion = + long oldCVersion = Review Comment: Should we change these variable names since we are no longer using cversion? ########## solr/solrj-zookeeper/src/java/org/apache/solr/common/cloud/ZkStateReader.java: ########## @@ -368,10 +368,152 @@ private StatefulCollectionWatch compute( BiFunction<String, StatefulCollectionWatch, StatefulCollectionWatch> remappingFunction) { return statefulWatchesByCollectionName.compute(collectionName, remappingFunction); } + + public boolean isWatched(String coll) { + return statefulWatchesByCollectionName.containsKey(coll); + } } - private static class StatefulCollectionWatch extends CollectionWatch<DocCollectionWatcher> { + private class StatefulCollectionWatch extends CollectionWatch<DocCollectionWatcher> { private DocCollection currentState; + + Watcher persistentWatcher; + + final String coll; + private final String collectionPath; + + private StatefulCollectionWatch(String coll) { + this.coll = coll; + this.collectionPath = DocCollection.getCollectionPath(coll); + } + + public void handleWatch(WatchedEvent event) { + if (!collectionWatches.isWatched(coll)) { + return; + } + if (log.isTraceEnabled()) { + log.trace("an event happened for {}, event: {}", coll, event.toString()); + } + DocCollection collectionState = getCollection(coll); + if (collectionPath.equals(event.getPath())) { + DocCollection newState = null; + try { + newState = fetchCollectionState(coll, null); + } catch (KeeperException.SessionExpiredException + | KeeperException.ConnectionLossException e) { + log.warn("ZooKeeper watch triggered, but Solr cannot talk to ZK: ", e); + } catch (KeeperException e) { + log.error("exception for collection: [{}]", coll, e); + throw new ZooKeeperException(ErrorCode.SERVER_ERROR, "A ZK error has occurred", e); + } catch (InterruptedException e) { + Thread.currentThread().interrupt(); + log.error("exception for collection: [{}]", coll, e); + } + collectionWatches.updateDocCollection(coll, newState); + synchronized (getUpdateLock()) { + constructState(Collections.singleton(coll)); + } + } + if (collectionState != null && collectionState.isPerReplicaState()) { + String path = event.getPath(); + if ((event.getType() == EventType.NodeCreated || event.getType() == EventType.NodeDeleted) + && path.length() > collectionState.getZNode().length() + && path.startsWith(collectionPath)) { + if (log.isDebugEnabled()) { + log.debug("PRS node event : {}", event.getType()); + } + + PerReplicaStates prs = collectionState.getPerReplicaStates(); + if (prs != null) { + String stateStr = path.substring(collectionPath.length() + 1); + PerReplicaStates.State newState = PerReplicaStates.State.parse(stateStr); + PerReplicaStates.State oldState = prs.states.get(newState.replica); + if (event.getType() == EventType.NodeCreated) { + if (oldState != null && newState.version < oldState.version) { + // we got a notification out of order? . Shouldn't happen + if (log.isTraceEnabled()) { + log.trace("newState {} < oldState {}", newState, oldState); Review Comment: I think we should bump up this log level assuming this is something that shouldn't regularly happen, I could see this being warn level. -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: issues-unsubscr...@solr.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org --------------------------------------------------------------------- To unsubscribe, e-mail: issues-unsubscr...@solr.apache.org For additional commands, e-mail: issues-h...@solr.apache.org