[TINKERPOP-1045] Client-Side Hangs when attempting to access a HashMap with Keys of type Integer

• Type: Improvement
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 3.1.0-incubating
• Fix Version/s: 3.1.1-incubating
• Component/s: server
• Assignee: Stephen Mallette
• Reporter: Shaunak Das
• Created: 16/Dec/15 00:36
• Updated: 21/Dec/15 23:16
• Resolved: 21/Dec/15 23:16

Description

I try to use a HashMap that has keys of type Integer, and send the following request:

gremlin> map = [1: "hello", 2: 3]
==>1=hello
==>2=3
gremlin> map[1]
==>hello
gremlin> map[2]
==>3
gremlin> client = Cluster.build().create().connect().alias("graph.g")
==>org.apache.tinkerpop.gremlin.driver.Client$ReboundClusteredClient@cda4919
gremlin> client.submit('1+1').all().get()
==>result{object=2 class=java.lang.Integer}
gremlin> client.submit('map[1]', map).all().get()


The client-side ends up hanging. The Gremlin Server logs give this, which is to be expected, as explained to me by Stephen:


WARN  [gremlin-server-worker-1] 2015-12-16 00:34:26,609  Slf4JLogger.java:151 - An exceptionCaught() event was fired, and it reached at the tail of the pipeline. It usually means the last handler in the pipeline did not handle the exception.
io.netty.handler.codec.DecoderException: java.lang.ClassCastException: java.lang.Integer cannot be cast to java.lang.String
	at io.netty.handler.codec.MessageToMessageDecoder.channelRead(MessageToMessageDecoder.java:99) [netty-all-4.0.33.dse.jar:4.0.33.dse]
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:318) [netty-all-4.0.33.dse.jar:4.0.33.dse]
	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:304) [netty-all-4.0.33.dse.jar:4.0.33.dse]
	at com.datastax.bdp.graph.plugin.GremlinServerGraphHandler.handleRequestMessage(GremlinServerGraphHandler.java:94) [dse-graph-5.0.0-DSP-5175.jar:5.0.0-DSP-5175]
	at com.datastax.bdp.graph.plugin.AbstractRequestMessageHandler.channelRead(AbstractRequestMessageHandler.java:62) [dse-graph-5.0.0-DSP-5175.jar:5.0.0-DSP-5175]
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:318) [netty-all-4.0.33.dse.jar:4.0.33.dse]
	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:304) [netty-all-4.0.33.dse.jar:4.0.33.dse]
	at com.datastax.bdp.cassandra.audit.GremlinServerAuditLogRequestHandler.handleRequestMessage(GremlinServerAuditLogRequestHandler.java:32) [dse-graph-5.0.0-DSP-5175.jar:5.0.0-DSP-5175]
	at com.datastax.bdp.graph.plugin.AbstractRequestMessageHandler.channelRead(AbstractRequestMessageHandler.java:62) [dse-graph-5.0.0-DSP-5175.jar:5.0.0-DSP-5175]
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:318) [netty-all-4.0.33.dse.jar:4.0.33.dse]
	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:304) [netty-all-4.0.33.dse.jar:4.0.33.dse]
	at io.netty.handler.codec.MessageToMessageDecoder.channelRead(MessageToMessageDecoder.java:103) [netty-all-4.0.33.dse.jar:4.0.33.dse]
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:318) [netty-all-4.0.33.dse.jar:4.0.33.dse]
	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:304) [netty-all-4.0.33.dse.jar:4.0.33.dse]
	at io.netty.handler.codec.MessageToMessageDecoder.channelRead(MessageToMessageDecoder.java:103) [netty-all-4.0.33.dse.jar:4.0.33.dse]
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:318) [netty-all-4.0.33.dse.jar:4.0.33.dse]
	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:304) [netty-all-4.0.33.dse.jar:4.0.33.dse]
	at io.netty.handler.codec.MessageToMessageDecoder.channelRead(MessageToMessageDecoder.java:103) [netty-all-4.0.33.dse.jar:4.0.33.dse]
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:318) [netty-all-4.0.33.dse.jar:4.0.33.dse]
	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:304) [netty-all-4.0.33.dse.jar:4.0.33.dse]
	at io.netty.handler.codec.MessageToMessageDecoder.channelRead(MessageToMessageDecoder.java:103) [netty-all-4.0.33.dse.jar:4.0.33.dse]
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:318) [netty-all-4.0.33.dse.jar:4.0.33.dse]
	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:304) [netty-all-4.0.33.dse.jar:4.0.33.dse]
	at io.netty.handler.codec.http.websocketx.WebSocketServerProtocolHandler$1.channelRead(WebSocketServerProtocolHandler.java:147) [netty-all-4.0.33.dse.jar:4.0.33.dse]
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:318) [netty-all-4.0.33.dse.jar:4.0.33.dse]
	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:304) [netty-all-4.0.33.dse.jar:4.0.33.dse]
	at io.netty.handler.codec.ByteToMessageDecoder.fireChannelRead(ByteToMessageDecoder.java:276) [netty-all-4.0.33.dse.jar:4.0.33.dse]
	at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:263) [netty-all-4.0.33.dse.jar:4.0.33.dse]
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:318) [netty-all-4.0.33.dse.jar:4.0.33.dse]
	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:304) [netty-all-4.0.33.dse.jar:4.0.33.dse]
	at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:848) [netty-all-4.0.33.dse.jar:4.0.33.dse]
	at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:131) [netty-all-4.0.33.dse.jar:4.0.33.dse]
	at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:511) [netty-all-4.0.33.dse.jar:4.0.33.dse]
	at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:468) [netty-all-4.0.33.dse.jar:4.0.33.dse]
	at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:382) [netty-all-4.0.33.dse.jar:4.0.33.dse]
	at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:354) [netty-all-4.0.33.dse.jar:4.0.33.dse]
	at io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:112) [netty-all-4.0.33.dse.jar:4.0.33.dse]
	at java.lang.Thread.run(Thread.java:745) [na:1.8.0_40]
Caused by: java.lang.ClassCastException: java.lang.Integer cannot be cast to java.lang.String
	at org.apache.tinkerpop.gremlin.server.op.AbstractEvalOpProcessor$$Lambda$451/1156928780.test(Unknown Source) ~[na:na]
	at java.util.stream.MatchOps$1MatchSink.accept(MatchOps.java:90) ~[na:1.8.0_40]
	at java.util.Spliterators$IteratorSpliterator.tryAdvance(Spliterators.java:1812) ~[na:1.8.0_40]
	at java.util.stream.ReferencePipeline.forEachWithCancel(ReferencePipeline.java:126) ~[na:1.8.0_40]
	at java.util.stream.AbstractPipeline.copyIntoWithCancel(AbstractPipeline.java:529) ~[na:1.8.0_40]
	at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:516) ~[na:1.8.0_40]
	at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:502) ~[na:1.8.0_40]
	at java.util.stream.MatchOps$MatchOp.evaluateSequential(MatchOps.java:230) ~[na:1.8.0_40]
	at java.util.stream.MatchOps$MatchOp.evaluateSequential(MatchOps.java:196) ~[na:1.8.0_40]
	at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) ~[na:1.8.0_40]
	at java.util.stream.ReferencePipeline.anyMatch(ReferencePipeline.java:449) ~[na:1.8.0_40]
	at org.apache.tinkerpop.gremlin.server.op.AbstractEvalOpProcessor.validateEvalMessage(AbstractEvalOpProcessor.java:137) ~[gremlin-server-3.1.1-SNAPSHOT-20151209-e1624745.jar:3.1.1-SNAPSHOT-20151209-e1624745]
	at org.apache.tinkerpop.gremlin.server.op.AbstractEvalOpProcessor.select(AbstractEvalOpProcessor.java:114) ~[gremlin-server-3.1.1-SNAPSHOT-20151209-e1624745.jar:3.1.1-SNAPSHOT-20151209-e1624745]
	at com.datastax.bdp.graph.plugin.DseOpSelectorHandler.decode(DseOpSelectorHandler.java:83) ~[dse-graph-5.0.0-DSP-5175.jar:5.0.0-DSP-5175]
	at com.datastax.bdp.graph.plugin.DseOpSelectorHandler.decode(DseOpSelectorHandler.java:42) ~[dse-graph-5.0.0-DSP-5175.jar:5.0.0-DSP-5175]
	at io.netty.handler.codec.MessageToMessageDecoder.channelRead(MessageToMessageDecoder.java:89) [netty-all-4.0.33.dse.jar:4.0.33.dse]
	... 37 common frames omitted

Any way to stop the hang on the client-side?