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Unhandled ConcurrentModificationException in RestHandler causes crash #339

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Unhandled ConcurrentModificationException in RestHandler causes crash#339
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@ebbesson
ebbesson
opened on Jun 25, 2014

Caught some something like this over at a customer today

Feels like it's related to the other concurrency issues we have today with the cache.
Customer is running 0.3.1

2014-06-19 19:25:12 : ERROR  : I/O dispatcher 1 : com.findwise.hydra.net.HttpRESTHandler : Unhandled exception occurred
java.util.ConcurrentModificationException: null
        at java.util.LinkedHashMap$LinkedHashIterator.nextEntry(LinkedHashMap.java:394) ~[na:1.7.0_07]
        at java.util.LinkedHashMap$EntryIterator.next(LinkedHashMap.java:413) ~[na:1.7.0_07]
        at java.util.LinkedHashMap$EntryIterator.next(LinkedHashMap.java:412) ~[na:1.7.0_07]
        at java.util.HashMap.putAllForCreate(HashMap.java:533) ~[na:1.7.0_07]
        at java.util.HashMap.<init>(HashMap.java:320) ~[na:1.7.0_07]
        at java.util.LinkedHashMap.<init>(LinkedHashMap.java:212) ~[na:1.7.0_07]
        at org.bson.BasicBSONObject.toMap(BasicBSONObject.java:76) ~[hydra-core.jar:na]
        at com.findwise.hydra.mongodb.MongoDocument.getMetadataMap(MongoDocument.java:185) ~[hydra-core.jar:na]
        at com.findwise.hydra.mongodb.MongoDocument.getMetadataSubMap(MongoDocument.java:407) ~[hydra-core.jar:na]
        at com.findwise.hydra.mongodb.MongoDocument.touchedBy(MongoDocument.java:415) ~[hydra-core.jar:na]
        at com.findwise.hydra.mongodb.MongoDocument.matches(MongoDocument.java:506) ~[hydra-core.jar:na]
        at com.findwise.hydra.MemoryCache.getDocument(MemoryCache.java:76) ~[hydra-core.jar:na]
        at com.findwise.hydra.MemoryCache.getAndTag(MemoryCache.java:104) ~[hydra-core.jar:na]
        at com.findwise.hydra.CachingDocumentNIO.getAndTag(CachingDocumentNIO.java:63) ~[hydra-core.jar:na]
        at com.findwise.hydra.net.QueryHandler.handle(QueryHandler.java:66) ~[hydra-core.jar:na]
        at com.findwise.hydra.net.HttpRESTHandler.dispatch(HttpRESTHandler.java:89) ~[hydra-core.jar:na]
        at com.findwise.hydra.net.HttpRESTHandler.handle(HttpRESTHandler.java:110) ~[hydra-core.jar:na]
        at org.apache.http.nio.protocol.BasicAsyncRequestHandler.handle(BasicAsyncRequestHandler.java:68) [hydra-core.jar:na]
        at org.apache.http.nio.protocol.BasicAsyncRequestHandler.handle(BasicAsyncRequestHandler.java:47) [hydra-core.jar:na]
        at org.apache.http.nio.protocol.HttpAsyncService.processRequest(HttpAsyncService.java:521) [hydra-core.jar:na]
        at org.apache.http.nio.protocol.HttpAsyncService.inputReady(HttpAsyncService.java:288) [hydra-core.jar:na]
        at org.apache.http.impl.nio.DefaultNHttpServerConnection.consumeInput(DefaultNHttpServerConnection.java:199) [hydra-core.jar:na]
        at org.apache.http.impl.nio.DefaultHttpServerIODispatch.onInputReady(DefaultHttpServerIODispatch.java:117) [hydra-core.jar:na]
        at org.apache.http.impl.nio.DefaultHttpServerIODispatch.onInputReady(DefaultHttpServerIODispatch.java:50) [hydra-core.jar:na]
        at org.apache.http.impl.nio.reactor.AbstractIODispatch.inputReady(AbstractIODispatch.java:112) [hydra-core.jar:na]
        at org.apache.http.impl.nio.reactor.BaseIOReactor.readable(BaseIOReactor.java:160) [hydra-core.jar:na]
        at org.apache.http.impl.nio.reactor.AbstractIOReactor.processEvent(AbstractIOReactor.java:342) [hydra-core.jar:na]
        at org.apache.http.impl.nio.reactor.AbstractIOReactor.processEvents(AbstractIOReactor.java:320) [hydra-core.jar:na]
        at org.apache.http.impl.nio.reactor.AbstractIOReactor.execute(AbstractIOReactor.java:280) [hydra-core.jar:na]
        at org.apache.http.impl.nio.reactor.BaseIOReactor.execute(BaseIOReactor.java:106) [hydra-core.jar:na]
        at org.apache.http.impl.nio.reactor.AbstractMultiworkerIOReactor$Worker.run(AbstractMultiworkerIOReactor.java:604) [hydra-core.jar:na]
        at java.lang.Thread.run(Thread.java:722) [na:1.7.0_07]
2014-06-19 19:25:12 : ERROR  : I/O dispatcher 1 : com.findwise.hydra.net.HttpRESTHandler : Unhandled exception occurred
java.util.ConcurrentModificationException: null
        at java.util.LinkedHashMap$LinkedHashIterator.nextEntry(LinkedHashMap.java:394) ~[na:1.7.0_07]
        at java.util.LinkedHashMap$EntryIterator.next(LinkedHashMap.java:413) ~[na:1.7.0_07]
        at java.util.LinkedHashMap$EntryIterator.next(LinkedHashMap.java:412) ~[na:1.7.0_07]
        at java.util.HashMap.putAllForCreate(HashMap.java:533) ~[na:1.7.0_07]
        at java.util.HashMap.<init>(HashMap.java:320) ~[na:1.7.0_07]
        at java.util.LinkedHashMap.<init>(LinkedHashMap.java:212) ~[na:1.7.0_07]
        at org.bson.BasicBSONObject.toMap(BasicBSONObject.java:76) ~[hydra-core.jar:na]
        at com.findwise.hydra.mongodb.MongoDocument.getMetadataMap(MongoDocument.java:185) ~[hydra-core.jar:na]
        at com.findwise.hydra.mongodb.MongoDocument.getMetadataSubMap(MongoDocument.java:407) ~[hydra-core.jar:na]
        at com.findwise.hydra.mongodb.MongoDocument.touchedBy(MongoDocument.java:415) ~[hydra-core.jar:na]
        at com.findwise.hydra.mongodb.MongoDocument.matches(MongoDocument.java:506) ~[hydra-core.jar:na]
        at com.findwise.hydra.MemoryCache.getDocument(MemoryCache.java:76) ~[hydra-core.jar:na]
        at com.findwise.hydra.MemoryCache.getAndTag(MemoryCache.java:104) ~[hydra-core.jar:na]
        at com.findwise.hydra.CachingDocumentNIO.getAndTag(CachingDocumentNIO.java:63) ~[hydra-core.jar:na]
        at com.findwise.hydra.net.QueryHandler.handle(QueryHandler.java:66) ~[hydra-core.jar:na]
        at com.findwise.hydra.net.HttpRESTHandler.dispatch(HttpRESTHandler.java:89) ~[hydra-core.jar:na]
        at com.findwise.hydra.net.HttpRESTHandler.handle(HttpRESTHandler.java:110) ~[hydra-core.jar:na]
        at org.apache.http.nio.protocol.BasicAsyncRequestHandler.handle(BasicAsyncRequestHandler.java:68) [hydra-core.jar:na]
        at org.apache.http.nio.protocol.BasicAsyncRequestHandler.handle(BasicAsyncRequestHandler.java:47) [hydra-core.jar:na]
        at org.apache.http.nio.protocol.HttpAsyncService.processRequest(HttpAsyncService.java:521) [hydra-core.jar:na]
        at org.apache.http.nio.protocol.HttpAsyncService.inputReady(HttpAsyncService.java:288) [hydra-core.jar:na]
        at org.apache.http.impl.nio.DefaultNHttpServerConnection.consumeInput(DefaultNHttpServerConnection.java:199) [hydra-core.jar:na]
        at org.apache.http.impl.nio.DefaultHttpServerIODispatch.onInputReady(DefaultHttpServerIODispatch.java:117) [hydra-core.jar:na]
        at org.apache.http.impl.nio.DefaultHttpServerIODispatch.onInputReady(DefaultHttpServerIODispatch.java:50) [hydra-core.jar:na]
        at org.apache.http.impl.nio.reactor.AbstractIODispatch.inputReady(AbstractIODispatch.java:112) [hydra-core.jar:na]
        at org.apache.http.impl.nio.reactor.BaseIOReactor.readable(BaseIOReactor.java:160) [hydra-core.jar:na]
        at org.apache.http.impl.nio.reactor.AbstractIOReactor.processEvent(AbstractIOReactor.java:342) [hydra-core.jar:na]
        at org.apache.http.impl.nio.reactor.AbstractIOReactor.processEvents(AbstractIOReactor.java:320) [hydra-core.jar:na]
        at org.apache.http.impl.nio.reactor.AbstractIOReactor.execute(AbstractIOReactor.java:280) [hydra-core.jar:na]
        at org.apache.http.impl.nio.reactor.BaseIOReactor.execute(BaseIOReactor.java:106) [hydra-core.jar:na]
        at org.apache.http.impl.nio.reactor.AbstractMultiworkerIOReactor$Worker.run(AbstractMultiworkerIOReactor.java:604) [hydra-core.jar:na]
        at java.lang.Thread.run(Thread.java:722) [na:1.7.0_07]
2014-06-19 19:25:12 : ERROR  : I/O dispatcher 1 : com.findwise.hydra.net.HttpResponseWriter : Printing Unhandled Exception
2014-06-19 19:25:12 : ERROR  : I/O dispatcher 1 : com.findwise.hydra.net.HttpResponseWriter : Printing Unhandled Exception
2014-06-19 19:25:12 : INFO   : Thread-5 : com.findwise.hydra.CachingDocumentNIO : Shutting down cache monitor thread. Attempting to save local changes.
2014-06-19 19:25:12 : INFO   : Thread-5 : com.findwise.hydra.CachingDocumentNIO : Shutting down cache monitor thread. Attempting to save local changes.
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