WhiteListing the loadbalancer host fails depending on forest configuration

[srinathgit]

So we can address your issue, please include the following:

Version of MarkLogic Java Client API

See Readme.txt

Version of MarkLogic Server

9.0-nightly
See admin gui on port 8001 or run xdmp:version() in Query Console - port 8000)

Java version

8
Run java -version

OS and version

For MAC, run sw_vers.
For Windows, run systeminfo | findstr /B /C:"OS Name" /C:"OS Version"
For Linux, run cat /etc/os-release and uname -r

Input: Some code to illustrate the problem, preferably in a state that can be independently reproduced on our end

Actual output: What did you observe? What errors did you see? Can you attach the logs? (Java logs, MarkLogic logs)

1. This issue is seen during whitelisting the load balancer host in a Write or QueryBatcher when forest is present in only one node in a 3 node cluster.
2. WhiteListing the loadbalancer host calls the "/v1/internal/forestinfo" endpoint . The response from this endpoint is different when the request is sent to the node with forest compared to the one when the node doesn't have the forest.
3. Response when the request is made to node with forest: [{"id":"9452417359753237858", "name":"Documents", "updatesAllowed":"all", "database":"Documents", "host":"ip-10-0-64-213.us-west-2.compute.internal", "requestHost":"ageorge-b-elasticl-11k9wnna7aftn-118865705.us-west-2.elb.amazonaws.com"}]
   Response when the request is made to node without forest: [{"id":"9452417359753237858", "name":"Documents", "updatesAllowed":"all", "database":"Documents", "host":"ip-10-0-64-213.us-west-2.compute.internal"}]
4. Since the second response doesn't contain the requestHost, validHosts.length returns zero in line 166 of FilteredForestConfiguration.java and the following exception is thrown

java.lang.IllegalStateException: White list or black list rules are too restrictive: no valid hosts are left
	at com.marklogic.client.datamovement.FilteredForestConfiguration.lambda$8(FilteredForestConfiguration.java:167)
	at java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:193)
	at java.util.Spliterators$ArraySpliterator.forEachRemaining(Spliterators.java:948)
	at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:481)
	at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:471)
	at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:545)
	at java.util.stream.AbstractPipeline.evaluateToArrayNode(AbstractPipeline.java:260)
	at java.util.stream.ReferencePipeline.toArray(ReferencePipeline.java:438)
	at com.marklogic.client.datamovement.FilteredForestConfiguration.listForests(FilteredForestConfiguration.java:195)
	at com.marklogic.client.datamovement.impl.WriteBatcherImpl.withForestConfig(WriteBatcherImpl.java:786)
	at com.marklogic.client.datamovement.impl.WriteBatcherImpl.withForestConfig(WriteBatcherImpl.java:1)
	at com.marklogic.client.datamovement.functionaltests.Common.initBatcher(Common.java:19)
	at com.marklogic.client.datamovement.functionaltests.StringQueryHostBatcherTest.testQueryBatcherCallbackClient(StringQueryHostBatcherTest.java:1125)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
	at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
	at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
	at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
	at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)
	at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:27)
	at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)
	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)
	at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
	at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
	at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
	at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
	at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
	at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)
	at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:27)
	at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
	at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:86)
	at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:538)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:760)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:460)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:206)

Expected output: What specifically did you expect to happen?

The host has to be whitelisted.

Alternatives: What else have you tried, actual/expected?

[ehennum]

As Srinath noted in conversation, this bug may be an unintended side effect of the fix for #668