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    java.io.IOException: Unexpected HTTP response: code=500 != 201, op=CREATE, message=unable to create new native thread
        at org.apache.hadoop.hdfs.web.WebHdfsFileSystem.validateResponse(WebHdfsFileSystem.java:303)
        at org.apache.hadoop.hdfs.web.WebHdfsFileSystem.access$500(WebHdfsFileSystem.java:111)
        at org.apache.hadoop.hdfs.web.WebHdfsFileSystem$1.close(WebHdfsFileSystem.java:710)
        at org.apache.hadoop.fs.FileSystemContractBaseTest.writeAndRead(FileSystemContractBaseTest.java:530)
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