Hello team,

I have an issue when use drill 1.16.
I have a mongo server as mongodb,
Then use drill first server connect mongodb, it is success and can select data.
Then I want to use other drill server connect mongodb, it can connect success, 
and can see database, but not see tables. If select, have an issue as below log.

Do you notice me what is lost on me side or how to fix, I guess one drill 
connect to mongo, then other drill will can not connect mongo and select data.

Thank you~
BR//Hongwei


[Error Id: d15207fe-4c07-45ae-867c-bf484371fd37 on abcd-c4:31010]
        at 
org.apache.drill.exec.server.rest.QueryWrapper.run(QueryWrapper.java:126) 
~[drill-java-exec-1.16.0.jar:1.16.0]
        at 
org.apache.drill.exec.server.rest.QueryResources.submitQueryJSON(QueryResources.java:74)
 ~[drill-java-exec-1.16.0.jar:1.16.0]
        at 
org.apache.drill.exec.server.rest.QueryResources.submitQuery(QueryResources.java:90)
 ~[drill-java-exec-1.16.0.jar:1.16.0]
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
~[na:1.8.0_221]
        at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) 
~[na:1.8.0_221]
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
 ~[na:1.8.0_221]
        at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_221]
        at 
org.glassfish.jersey.server.model.internal.ResourceMethodInvocationHandlerFactory$1.invoke(ResourceMethodInvocationHandlerFactory.java:81)
 [jersey-server-2.25.1.jar:na]
        at 
org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher$1.run(AbstractJavaResourceMethodDispatcher.java:144)
 [jersey-server-2.25.1.jar:na]
        at 
org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher.invoke(AbstractJavaResourceMethodDispatcher.java:161)
 [jersey-server-2.25.1.jar:na]
        at 
org.glassfish.jersey.server.model.internal.JavaResourceMethodDispatcherProvider$TypeOutInvoker.doDispatch(JavaResourceMethodDispatcherProvider.java:205)
 [jersey-server-2.25.1.jar:na]
        at 
org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher.dispatch(AbstractJavaResourceMethodDispatcher.java:99)
 [jersey-server-2.25.1.jar:na]
        at 
org.glassfish.jersey.server.model.ResourceMethodInvoker.invoke(ResourceMethodInvoker.java:389)
 [jersey-server-2.25.1.jar:na]
        at 
org.glassfish.jersey.server.model.ResourceMethodInvoker.apply(ResourceMethodInvoker.java:347)
 [jersey-server-2.25.1.jar:na]
        at 
org.glassfish.jersey.server.model.ResourceMethodInvoker.apply(ResourceMethodInvoker.java:102)
 [jersey-server-2.25.1.jar:na]
        at 
org.glassfish.jersey.server.ServerRuntime$2.run(ServerRuntime.java:326) 
[jersey-server-2.25.1.jar:na]
        at org.glassfish.jersey.internal.Errors$1.call(Errors.java:271) 
[jersey-common-2.25.1.jar:na]
        at org.glassfish.jersey.internal.Errors$1.call(Errors.java:267) 
[jersey-common-2.25.1.jar:na]
        at org.glassfish.jersey.internal.Errors.process(Errors.java:315) 
[jersey-common-2.25.1.jar:na]
        at org.glassfish.jersey.internal.Errors.process(Errors.java:297) 
[jersey-common-2.25.1.jar:na]
        at org.glassfish.jersey.internal.Errors.process(Errors.java:267) 
[jersey-common-2.25.1.jar:na]
        at 
org.glassfish.jersey.process.internal.RequestScope.runInScope(RequestScope.java:317)
 [jersey-common-2.25.1.jar:na]
        at 
org.glassfish.jersey.server.ServerRuntime.process(ServerRuntime.java:305) 
[jersey-server-2.25.1.jar:na]
        at 
org.glassfish.jersey.server.ApplicationHandler.handle(ApplicationHandler.java:1154)
 [jersey-server-2.25.1.jar:na]
        at 
org.glassfish.jersey.servlet.WebComponent.serviceImpl(WebComponent.java:473) 
[jersey-container-servlet-core-2.25.1.jar:na]
        at 
org.glassfish.jersey.servlet.WebComponent.service(WebComponent.java:427) 
[jersey-container-servlet-core-2.25.1.jar:na]
        at 
org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:388)
 [jersey-container-servlet-core-2.25.1.jar:na]
        at 
org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:341)
 [jersey-container-servlet-core-2.25.1.jar:na]
        at 
org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:228)
 [jersey-container-servlet-core-2.25.1.jar:na]
        at 
org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:848) 
[jetty-servlet-9.3.25.v20180904.jar:9.3.25.v20180904]
        at 
org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:585) 
[jetty-servlet-9.3.25.v20180904.jar:9.3.25.v20180904]
        at 
org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:224)
 [jetty-server-9.3.25.v20180904.jar:9.3.25.v20180904]
        at 
org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1180)
 [jetty-server-9.3.25.v20180904.jar:9.3.25.v20180904]
        at 
org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:513) 
[jetty-servlet-9.3.25.v20180904.jar:9.3.25.v20180904]
        at 
org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:185)
 [jetty-server-9.3.25.v20180904.jar:9.3.25.v20180904]
        at 
org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1112)
 [jetty-server-9.3.25.v20180904.jar:9.3.25.v20180904]
        at 
org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141) 
[jetty-server-9.3.25.v20180904.jar:9.3.25.v20180904]
        at 
org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:134) 
[jetty-server-9.3.25.v20180904.jar:9.3.25.v20180904]
        at org.eclipse.jetty.server.Server.handle(Server.java:539) 
[jetty-server-9.3.25.v20180904.jar:9.3.25.v20180904]
        at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:333) 
[jetty-server-9.3.25.v20180904.jar:9.3.25.v20180904]
        at 
org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:251) 
[jetty-server-9.3.25.v20180904.jar:9.3.25.v20180904]
        at 
org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:283)
 [jetty-io-9.3.25.v20180904.jar:9.3.25.v20180904]
        at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:108) 
[jetty-io-9.3.25.v20180904.jar:9.3.25.v20180904]
        at 
org.eclipse.jetty.io.SelectChannelEndPoint$2.run(SelectChannelEndPoint.java:93) 
[jetty-io-9.3.25.v20180904.jar:9.3.25.v20180904]
        at 
org.eclipse.jetty.util.thread.strategy.ExecuteProduceConsume.executeProduceConsume(ExecuteProduceConsume.java:303)
 [jetty-util-9.3.25.v20180904.jar:9.3.25.v20180904]
        at 
org.eclipse.jetty.util.thread.strategy.ExecuteProduceConsume.produceConsume(ExecuteProduceConsume.java:148)
 [jetty-util-9.3.25.v20180904.jar:9.3.25.v20180904]
        at 
org.eclipse.jetty.util.thread.strategy.ExecuteProduceConsume.run(ExecuteProduceConsume.java:136)
 [jetty-util-9.3.25.v20180904.jar:9.3.25.v20180904]
        at 
org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:671)
 [jetty-util-9.3.25.v20180904.jar:9.3.25.v20180904]
        at 
org.eclipse.jetty.util.thread.QueuedThreadPool$2.run(QueuedThreadPool.java:589) 
[jetty-util-9.3.25.v20180904.jar:9.3.25.v20180904]
        at java.lang.Thread.run(Thread.java:748) [na:1.8.0_221]
org.apache.drill.exec.work.foreman.ForemanException: Unexpected exception 
during fragment initialization: Error while applying rule DrillTableRule, args 
[rel#44:EnumerableTableScan.ENUMERABLE.ANY([]).[](table=[mongo, ABCD, 
UtranFreqRelation_20190904])]
        at org.apache.drill.exec.work.foreman.Foreman.run(Foreman.java:305) 
~[drill-java-exec-1.16.0.jar:1.16.0]
        at .......(:0) ~[na:na]
Caused by: java.lang.RuntimeException: Error while applying rule 
DrillTableRule, args 
[rel#44:EnumerableTableScan.ENUMERABLE.ANY([]).[](table=[mongo, ABCD, 
UtranFreqRelation_20190904])]
        at 
org.apache.calcite.plan.volcano.VolcanoRuleCall.onMatch(VolcanoRuleCall.java:236)
 ~[calcite-core-1.18.0-drill-r0.jar:1.18.0-drill-r0]
        at 
org.apache.calcite.plan.volcano.VolcanoPlanner.findBestExp(VolcanoPlanner.java:643)
 ~[calcite-core-1.18.0-drill-r0.jar:1.18.0-drill-r0]
        at 
org.apache.calcite.tools.Programs$RuleSetProgram.run(Programs.java:339) 
~[calcite-core-1.18.0-drill-r0.jar:1.18.0-drill-r0]
        at 
org.apache.drill.exec.planner.sql.handlers.DefaultSqlHandler.transform(DefaultSqlHandler.java:430)
 ~[drill-java-exec-1.16.0.jar:1.16.0]
        at 
org.apache.drill.exec.planner.sql.handlers.DefaultSqlHandler.transform(DefaultSqlHandler.java:370)
 ~[drill-java-exec-1.16.0.jar:1.16.0]
        at 
org.apache.drill.exec.planner.sql.handlers.DefaultSqlHandler.convertToRawDrel(DefaultSqlHandler.java:250)
 ~[drill-java-exec-1.16.0.jar:1.16.0]
        at 
org.apache.drill.exec.planner.sql.handlers.DefaultSqlHandler.convertToDrel(DefaultSqlHandler.java:319)
 ~[drill-java-exec-1.16.0.jar:1.16.0]
        at 
org.apache.drill.exec.planner.sql.handlers.DefaultSqlHandler.getPlan(DefaultSqlHandler.java:177)
 ~[drill-java-exec-1.16.0.jar:1.16.0]
        at 
org.apache.drill.exec.planner.sql.DrillSqlWorker.getQueryPlan(DrillSqlWorker.java:216)
 ~[drill-java-exec-1.16.0.jar:1.16.0]
        at 
org.apache.drill.exec.planner.sql.DrillSqlWorker.convertPlan(DrillSqlWorker.java:130)
 ~[drill-java-exec-1.16.0.jar:1.16.0]
        at 
org.apache.drill.exec.planner.sql.DrillSqlWorker.getPlan(DrillSqlWorker.java:87)
 ~[drill-java-exec-1.16.0.jar:1.16.0]
        at org.apache.drill.exec.work.foreman.Foreman.runSQL(Foreman.java:593) 
~[drill-java-exec-1.16.0.jar:1.16.0]
        at org.apache.drill.exec.work.foreman.Foreman.run(Foreman.java:276) 
~[drill-java-exec-1.16.0.jar:1.16.0]
        ... 1 common frames omitted
Caused by: java.lang.NullPointerException:
        at 
org.apache.drill.shaded.guava.com.google.common.base.Preconditions.checkNotNull(Preconditions.java:787)
 ~[drill-shaded-guava-23.0.jar:23.0]
        at 
org.apache.drill.exec.store.mongo.MongoGroupScan.getPrimaryShardInfo(MongoGroupScan.java:306)
 ~[drill-mongo-storage-1.16.0.jar:1.16.0]
        at 
org.apache.drill.exec.store.mongo.MongoGroupScan.init(MongoGroupScan.java:272) 
~[drill-mongo-storage-1.16.0.jar:1.16.0]
        at 
org.apache.drill.exec.store.mongo.MongoGroupScan.<init>(MongoGroupScan.java:137)
 ~[drill-mongo-storage-1.16.0.jar:1.16.0]
        at 
org.apache.drill.exec.store.mongo.MongoStoragePlugin.getPhysicalScan(MongoStoragePlugin.java:92)
 ~[drill-mongo-storage-1.16.0.jar:1.16.0]
        at 
org.apache.drill.exec.store.AbstractStoragePlugin.getPhysicalScan(AbstractStoragePlugin.java:112)
 ~[drill-java-exec-1.16.0.jar:1.16.0]
        at 
org.apache.drill.exec.store.AbstractStoragePlugin.getPhysicalScan(AbstractStoragePlugin.java:117)
 ~[drill-java-exec-1.16.0.jar:1.16.0]
        at 
org.apache.drill.exec.planner.logical.DrillTable.getGroupScan(DrillTable.java:117)
 ~[drill-java-exec-1.16.0.jar:1.16.0]
        at 
org.apache.drill.exec.planner.common.DrillScanRelBase.<init>(DrillScanRelBase.java:51)
 ~[drill-java-exec-1.16.0.jar:1.16.0]
        at 
org.apache.drill.exec.planner.logical.DrillScanRel.<init>(DrillScanRel.java:79) 
~[drill-java-exec-1.16.0.jar:1.16.0]
        at 
org.apache.drill.exec.planner.logical.DrillScanRel.<init>(DrillScanRel.java:66) 
~[drill-java-exec-1.16.0.jar:1.16.0]
        at 
org.apache.drill.exec.planner.logical.DrillScanRel.<init>(DrillScanRel.java:59) 
~[drill-java-exec-1.16.0.jar:1.16.0]
        at 
org.apache.drill.exec.planner.logical.DrillScanRule.onMatch(DrillScanRule.java:38)
 ~[drill-java-exec-1.16.0.jar:1.16.0]
        at 
org.apache.calcite.plan.volcano.VolcanoRuleCall.onMatch(VolcanoRuleCall.java:212)
 ~[calcite-core-1.18.0-drill-r0.jar:1.18.0-drill-r0]
        ... 13 common frames omitted

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