[TINKERPOP-1148] ConcurrentModificationException with bindings in Gremlin Server

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Done
• Affects Version/s: 3.1.1-incubating
• Fix Version/s: 3.2.0-incubating, 3.1.2-incubating
• Component/s: server
• Assignee: Stephen Mallette
• Reporter: Daniel Kuppitz
• Created: 12/Feb/16 01:54
• Updated: 22/Feb/16 13:31
• Resolved: 22/Feb/16 13:31

Description

When bulk loading data through Gremlin Server, this exception pops up from time to time and ultimately kills the BLVP job if the dataset is large enough:

WARN  [gremlin-server-worker-1] 2016-02-11 18:36:39,055  OpExecutorHandler.java:77 - null
java.util.ConcurrentModificationException: null
        at java.util.HashMap$HashIterator.nextNode(HashMap.java:1429) ~[na:1.8.0_40]
        at java.util.HashMap$EntryIterator.next(HashMap.java:1463) ~[na:1.8.0_40]
        at java.util.HashMap$EntryIterator.next(HashMap.java:1461) ~[na:1.8.0_40]
        at javax.script.SimpleBindings.putAll(SimpleBindings.java:97) ~[na:1.8.0_40]
        at org.apache.tinkerpop.gremlin.groovy.engine.GremlinExecutor.eval(GremlinExecutor.java:249) ~[gremlin-groovy-3.1.1-20160128-20db86cb.jar:3.1.1-20160128-20db86cb]
        at com.datastax.bdp.graph.plugin.DseSessionOpProcessor.evalOpInternal(DseSessionOpProcessor.java:151) ~[dse-graph-5.0.0-DSP-5881.jar:5.0.0-DSP-5881]
        at com.datastax.bdp.graph.plugin.DseSessionOpProcessor.evalOp(DseSessionOpProcessor.java:55) ~[dse-graph-5.0.0-DSP-5881.jar:5.0.0-DSP-5881]
        at org.apache.tinkerpop.gremlin.server.op.session.SessionOpProcessor$$Lambda$665/1222772686.accept(Unknown Source) ~[na:na]
        at org.apache.tinkerpop.gremlin.server.handler.OpExecutorHandler.channelRead0(OpExecutorHandler.java:68) [gremlin-server-3.1.1-20160128-20db86cb.jar:3.1.1-20160128-20db86cb]
        at org.apache.tinkerpop.gremlin.server.handler.OpExecutorHandler.channelRead0(OpExecutorHandler.java:43) [gremlin-server-3.1.1-20160128-20db86cb.jar:3.1.1-20160128-20db86cb]
        at io.netty.channel.SimpleChannelInboundHandler.channelRead(SimpleChannelInboundHandler.java:105) [netty-all-4.0.34.Final.jar:4.0.34.Final]
        at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:307) [netty-all-4.0.34.Final.jar:4.0.34.Final]
        at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:293) [netty-all-4.0.34.Final.jar:4.0.34.Final]
        at io.netty.handler.codec.MessageToMessageDecoder.channelRead(MessageToMessageDecoder.java:103) [netty-all-4.0.34.Final.jar:4.0.34.Final]
        at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:307) [netty-all-4.0.34.Final.jar:4.0.34.Final]
        at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:293) [netty-all-4.0.34.Final.jar:4.0.34.Final]
...

Another exception, which seems to be a follow up error, is this:

WARN  [pool-235-thread-1] 2016-02-11 18:36:28,348  DseSessionOpProcessor.java:166 - Exception processing a script on request [RequestMessage{, requestId=624f7cae-2ae6-43bb-8f12-ea32a9f19dcd, op='eval', processor='session', args={gremlin=createVertex(l, i), session=9df05f13-5a68-4231-a021-2e270709d84d, bindings={i=null, l=user}, batchSize=64}}].
groovy.lang.MissingPropertyException: No such property: l for class: Script2
        at org.codehaus.groovy.runtime.ScriptBytecodeAdapter.unwrap(ScriptBytecodeAdapter.java:53) ~[groovy-2.4.5-indy.jar:2.4.5]
        at org.codehaus.groovy.runtime.callsite.PogoGetPropertySite.getProperty(PogoGetPropertySite.java:52) ~[groovy-2.4.5-indy.jar:2.4.5]
        at org.codehaus.groovy.runtime.callsite.AbstractCallSite.callGroovyObjectGetProperty(AbstractCallSite.java:307) ~[groovy-2.4.5-indy.jar:2.4.5]
        at Script2.run(Script2.groovy:1) ~[na:na]
        at org.apache.tinkerpop.gremlin.groovy.jsr223.GremlinGroovyScriptEngine.eval(GremlinGroovyScriptEngine.java:534) ~[gremlin-groovy-3.1.1-20160128-20db86cb.jar:3.1.1-20160128-20db86cb]
        at org.apache.tinkerpop.gremlin.groovy.jsr223.GremlinGroovyScriptEngine.eval(GremlinGroovyScriptEngine.java:374) ~[gremlin-groovy-3.1.1-20160128-20db86cb.jar:3.1.1-20160128-20db86cb]
        at javax.script.AbstractScriptEngine.eval(AbstractScriptEngine.java:233) ~[na:1.8.0_40]
        at org.apache.tinkerpop.gremlin.groovy.engine.ScriptEngines.eval(ScriptEngines.java:102) ~[gremlin-groovy-3.1.1-20160128-20db86cb.jar:3.1.1-20160128-20db86cb]
        at org.apache.tinkerpop.gremlin.groovy.engine.GremlinExecutor.lambda$eval$15(GremlinExecutor.java:258) ~[gremlin-groovy-3.1.1-20160128-20db86cb.jar:3.1.1-20160128-20db86cb]
        at org.apache.tinkerpop.gremlin.groovy.engine.GremlinExecutor$$Lambda$489/399043474.call(Unknown Source) [gremlin-groovy-3.1.1-20160128-20db86cb.jar:3.1.1-20160128-20db86cb]
        at java.util.concurrent.FutureTask.run(FutureTask.java:266) [na:1.8.0_40]
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) [na:1.8.0_40]
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) [na:1.8.0_40]
        at java.lang.Thread.run(Thread.java:745) [na:1.8.0_40]