[ 
https://issues.apache.org/jira/browse/BEAM-11622?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17263660#comment-17263660
 ] 

Kyle Weaver commented on BEAM-11622:
------------------------------------

Full stack trace:

Caused by: java.lang.OutOfMemoryError: Java heap space
        at java.util.Arrays.copyOf(Arrays.java:3332)
        at 
java.lang.AbstractStringBuilder.ensureCapacityInternal(AbstractStringBuilder.java:124)
        at 
java.lang.AbstractStringBuilder.append(AbstractStringBuilder.java:448)
        at java.lang.StringBuffer.append(StringBuffer.java:270)
        at java.io.StringWriter.write(StringWriter.java:112)
        at com.google.gson.stream.JsonWriter.string(JsonWriter.java:590)
        at com.google.gson.stream.JsonWriter.value(JsonWriter.java:418)
        at 
com.google.gson.internal.bind.TypeAdapters$29.write(TypeAdapters.java:746)
        at 
com.google.gson.internal.bind.TypeAdapters$29.write(TypeAdapters.java:760)
        at 
com.google.gson.internal.bind.TypeAdapters$29.write(TypeAdapters.java:760)
        at 
com.google.gson.internal.bind.TypeAdapters$29.write(TypeAdapters.java:760)
        at 
com.google.gson.internal.bind.TypeAdapters$29.write(TypeAdapters.java:752)
        at 
com.google.gson.internal.bind.TypeAdapters$29.write(TypeAdapters.java:698)
        at com.google.gson.internal.Streams.write(Streams.java:72)
        at com.google.gson.JsonElement.toString(JsonElement.java:316)
        at 
org.apache.beam.sdk.io.gcp.healthcare.JsonArrayCoder.encode(JsonArrayCoder.java:41)
        at 
org.apache.beam.sdk.io.gcp.healthcare.JsonArrayCoder.encode(JsonArrayCoder.java:28)
        at org.apache.beam.sdk.coders.Coder.encode(Coder.java:136)
        at org.apache.beam.sdk.coders.Coder.structuralValue(Coder.java:255)
        at 
org.apache.beam.sdk.util.MutationDetectors$CodedValueMutationDetector.<init>(MutationDetectors.java:119)
        at 
org.apache.beam.sdk.util.MutationDetectors.forValueWithCoder(MutationDetectors.java:49)
        at 
org.apache.beam.runners.direct.ImmutabilityCheckingBundleFactory$ImmutabilityEnforcingBundle.add(ImmutabilityCheckingBundleFactory.java:115)
        at 
org.apache.beam.runners.direct.ParDoEvaluator$BundleOutputManager.output(ParDoEvaluator.java:305)
        at 
org.apache.beam.repackaged.direct_java.runners.core.SimpleDoFnRunner.outputWindowedValue(SimpleDoFnRunner.java:272)
        at 
org.apache.beam.repackaged.direct_java.runners.core.SimpleDoFnRunner.access$900(SimpleDoFnRunner.java:84)
        at 
org.apache.beam.repackaged.direct_java.runners.core.SimpleDoFnRunner$DoFnProcessContext.output(SimpleDoFnRunner.java:418)
        at 
org.apache.beam.repackaged.direct_java.runners.core.SimpleDoFnRunner$DoFnProcessContext.output(SimpleDoFnRunner.java:406)
        at 
org.apache.beam.sdk.io.gcp.healthcare.FhirIO$Search$SearchResourcesJsonString$SearchResourcesFn.processElement(FhirIO.java:1582)
        at 
org.apache.beam.sdk.io.gcp.healthcare.FhirIO$Search$SearchResourcesJsonString$SearchResourcesFn$DoFnInvoker.invokeProcessElement(Unknown
 Source)
        at 
org.apache.beam.repackaged.direct_java.runners.core.SimpleDoFnRunner.invokeProcessElement(SimpleDoFnRunner.java:232)
        at 
org.apache.beam.repackaged.direct_java.runners.core.SimpleDoFnRunner.processElement(SimpleDoFnRunner.java:191)
        at 
org.apache.beam.repackaged.direct_java.runners.core.SimplePushbackSideInputDoFnRunner.processElementInReadyWindows(SimplePushbackSideInputDoFnRunner.java:79)


> Flaky test: 
> org.apache.beam.sdk.io.gcp.healthcare.FhirIOSearchIT.testFhirIOSearch[R4]
> -------------------------------------------------------------------------------------
>
>                 Key: BEAM-11622
>                 URL: https://issues.apache.org/jira/browse/BEAM-11622
>             Project: Beam
>          Issue Type: Bug
>          Components: test-failures
>            Reporter: Rui Wang
>            Priority: P1
>
> This test sometimes causes out of memory errors ("java.lang.OutOfMemoryError: 
> Java heap space").
> https://ci-beam.apache.org/job/beam_PostCommit_Java/7061/
> https://ci-beam.apache.org/job/beam_PostCommit_Java/7071/
> https://ci-beam.apache.org/job/beam_PostCommit_Java/7074/
> https://ci-beam.apache.org/job/beam_PostCommit_Java/7051/
> https://ci-beam.apache.org/job/beam_PostCommit_Java/7052/



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