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https://issues.apache.org/jira/browse/OAK-3373?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14736694#comment-14736694
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Michael Dürig commented on OAK-3373:
------------------------------------
bq. and then added (ObserverTracker.addingService) with the new store again.
This sounds scary. E.g. {{BackgroundObserver}} might have more "old" node state
in its queue.
On a separate note, I don't think we ever considered the use case of restarting
the node store. Other components might also not be prepared for this (i.e.
holding on to "old" node states). Those in the observers might just be the
lowest hanging fruit.
> Observers dont survive store restart (was: LuceneIndexProvider:
> java.lang.IllegalStateException: open)
> ------------------------------------------------------------------------------------------------------
>
> Key: OAK-3373
> URL: https://issues.apache.org/jira/browse/OAK-3373
> Project: Jackrabbit Oak
> Issue Type: Bug
> Components: core
> Affects Versions: 1.3.5
> Reporter: Stefan Egli
>
> The following exception occurs when stopping, then immediately re-starting
> the oak-core bundle (which was done as part of testing for OAK-3250 - but can
> be reproduced independently). It's not clear what the consequences are
> though..
> {code}08.09.2015 14:20:26.960 *ERROR* [oak-lucene-0]
> org.apache.jackrabbit.oak.plugins.index.lucene.LuceneIndexProvider Uncaught
> exception in
> org.apache.jackrabbit.oak.plugins.index.lucene.LuceneIndexProvider@3a4a6c5c
> org.apache.jackrabbit.oak.plugins.document.DocumentStoreException: Error
> occurred while fetching children for path /oak:index/authorizables
> at
> org.apache.jackrabbit.oak.plugins.document.DocumentStoreException.convert(DocumentStoreException.java:48)
> at
> org.apache.jackrabbit.oak.plugins.document.DocumentNodeStore.getChildren(DocumentNodeStore.java:902)
> at
> org.apache.jackrabbit.oak.plugins.document.DocumentNodeStore.getChildNodes(DocumentNodeStore.java:1082)
> at
> org.apache.jackrabbit.oak.plugins.document.DocumentNodeState.getChildNodeEntries(DocumentNodeState.java:508)
> at
> org.apache.jackrabbit.oak.plugins.document.DocumentNodeState.access$100(DocumentNodeState.java:65)
> at
> org.apache.jackrabbit.oak.plugins.document.DocumentNodeState$ChildNodeEntryIterator.fetchMore(DocumentNodeState.java:716)
> at
> org.apache.jackrabbit.oak.plugins.document.DocumentNodeState$ChildNodeEntryIterator.<init>(DocumentNodeState.java:681)
> at
> org.apache.jackrabbit.oak.plugins.document.DocumentNodeState$1.iterator(DocumentNodeState.java:289)
> at
> org.apache.jackrabbit.oak.spi.state.AbstractNodeState.compareAgainstBaseState(AbstractNodeState.java:129)
> at
> org.apache.jackrabbit.oak.spi.state.AbstractNodeState.compareAgainstBaseState(AbstractNodeState.java:303)
> at
> org.apache.jackrabbit.oak.plugins.document.DocumentNodeState.compareAgainstBaseState(DocumentNodeState.java:359)
> at
> org.apache.jackrabbit.oak.spi.commit.EditorDiff.childNodeChanged(EditorDiff.java:148)
> at
> org.apache.jackrabbit.oak.spi.state.AbstractNodeState.compareAgainstBaseState(AbstractNodeState.java:140)
> at
> org.apache.jackrabbit.oak.spi.state.AbstractNodeState.compareAgainstBaseState(AbstractNodeState.java:303)
> at
> org.apache.jackrabbit.oak.plugins.document.DocumentNodeState.compareAgainstBaseState(DocumentNodeState.java:359)
> at
> org.apache.jackrabbit.oak.spi.commit.EditorDiff.childNodeChanged(EditorDiff.java:148)
> at
> org.apache.jackrabbit.oak.spi.state.AbstractNodeState.compareAgainstBaseState(AbstractNodeState.java:140)
> at
> org.apache.jackrabbit.oak.spi.state.AbstractNodeState.compareAgainstBaseState(AbstractNodeState.java:303)
> at
> org.apache.jackrabbit.oak.plugins.document.DocumentNodeState.compareAgainstBaseState(DocumentNodeState.java:359)
> at
> org.apache.jackrabbit.oak.spi.commit.EditorDiff.process(EditorDiff.java:52)
> at
> org.apache.jackrabbit.oak.plugins.index.lucene.IndexTracker.update(IndexTracker.java:108)
> at
> org.apache.jackrabbit.oak.plugins.index.lucene.LuceneIndexProvider.contentChanged(LuceneIndexProvider.java:73)
> at
> org.apache.jackrabbit.oak.spi.commit.BackgroundObserver$1$1.call(BackgroundObserver.java:127)
> at
> org.apache.jackrabbit.oak.spi.commit.BackgroundObserver$1$1.call(BackgroundObserver.java:121)
> at java.util.concurrent.FutureTask.run(FutureTask.java:262)
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
> at java.lang.Thread.run(Thread.java:745)
> Caused by: java.lang.IllegalStateException: open
> at org.bson.util.Assertions.isTrue(Assertions.java:36)
> at
> com.mongodb.DBTCPConnector.isMongosConnection(DBTCPConnector.java:367)
> at com.mongodb.Mongo.isMongosConnection(Mongo.java:622)
> at com.mongodb.DBCursor._check(DBCursor.java:494)
> at com.mongodb.DBCursor._hasNext(DBCursor.java:621)
> at com.mongodb.DBCursor.hasNext(DBCursor.java:657)
> at
> org.apache.jackrabbit.oak.plugins.document.mongo.MongoDocumentStore.queryInternal(MongoDocumentStore.java:658)
> at
> org.apache.jackrabbit.oak.plugins.document.mongo.MongoDocumentStore.query(MongoDocumentStore.java:589)
> at
> org.apache.jackrabbit.oak.plugins.document.mongo.MongoDocumentStore.query(MongoDocumentStore.java:561)
> at
> org.apache.jackrabbit.oak.plugins.document.util.LeaseCheckDocumentStoreWrapper.query(LeaseCheckDocumentStoreWrapper.java:77)
> at
> org.apache.jackrabbit.oak.plugins.document.DocumentNodeStore.readChildDocs(DocumentNodeStore.java:1003)
> at
> org.apache.jackrabbit.oak.plugins.document.DocumentNodeStore.readChildren(DocumentNodeStore.java:933)
> at
> org.apache.jackrabbit.oak.plugins.document.DocumentNodeStore$6.call(DocumentNodeStore.java:885)
> at
> org.apache.jackrabbit.oak.plugins.document.DocumentNodeStore$6.call(DocumentNodeStore.java:882)
> at
> org.apache.jackrabbit.oak.cache.CacheLIRS$Segment.load(CacheLIRS.java:1004)
> at
> org.apache.jackrabbit.oak.cache.CacheLIRS$Segment.get(CacheLIRS.java:969)
> at org.apache.jackrabbit.oak.cache.CacheLIRS.get(CacheLIRS.java:280)
> at
> org.apache.jackrabbit.oak.plugins.document.persistentCache.NodeCache.get(NodeCache.java:116)
> at
> org.apache.jackrabbit.oak.plugins.document.DocumentNodeStore.getChildren(DocumentNodeStore.java:882)
> ... 26 common frames omitted
> {code}
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