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https://issues.apache.org/jira/browse/HIVE-20989?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16726550#comment-16726550
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anishek commented on HIVE-20989:
--------------------------------
+1
> JDBC - The GetOperationStatus + log can block query progress via sleep()
> ------------------------------------------------------------------------
>
> Key: HIVE-20989
> URL: https://issues.apache.org/jira/browse/HIVE-20989
> Project: Hive
> Issue Type: Bug
> Components: HiveServer2
> Affects Versions: 4.0.0
> Reporter: Gopal V
> Assignee: Sankar Hariappan
> Priority: Major
> Attachments: HIVE-20989.01.patch
>
>
> There is an exponential sleep operation inside the CLIService which can end
> up adding tens of seconds to a query which has already completed.
> {code}
> "HiveServer2-Handler-Pool: Thread-9373" #9373 prio=5 os_prio=0
> tid=0x00007f4d5e72d800 nid=0xb634a waiting on condition [0x00007f28d06a5000]
> java.lang.Thread.State: TIMED_WAITING (sleeping)
> at java.lang.Thread.sleep(Native Method)
> at
> org.apache.hive.service.cli.CLIService.progressUpdateLog(CLIService.java:506)
> at
> org.apache.hive.service.cli.CLIService.getOperationStatus(CLIService.java:480)
> at
> org.apache.hive.service.cli.thrift.ThriftCLIService.GetOperationStatus(ThriftCLIService.java:695)
> at
> org.apache.hive.service.rpc.thrift.TCLIService$Processor$GetOperationStatus.getResult(TCLIService.java:1757)
> at
> org.apache.hive.service.rpc.thrift.TCLIService$Processor$GetOperationStatus.getResult(TCLIService.java:1742)
> at org.apache.thrift.ProcessFunction.process(ProcessFunction.java:39)
> at org.apache.thrift.TBaseProcessor.process(TBaseProcessor.java:39)
> at
> org.apache.hive.service.auth.TSetIpAddressProcessor.process(TSetIpAddressProcessor.java:56)
> at
> org.apache.thrift.server.TThreadPoolServer$WorkerProcess.run(TThreadPoolServer.java:286)
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
> at java.lang.Thread.run(Thread.java:745)
> {code}
> The sleep loop is on the server side.
> {code}
> private static final long PROGRESS_MAX_WAIT_NS = 30 * 1000000000l;
> private JobProgressUpdate progressUpdateLog(boolean isProgressLogRequested,
> Operation operation, HiveConf conf) {
> ...
> long startTime = System.nanoTime();
> int timeOutMs = 8;
> try {
> while (sessionState.getProgressMonitor() == null &&
> !operation.isDone()) {
> long remainingMs = (PROGRESS_MAX_WAIT_NS - (System.nanoTime() -
> startTime)) / 1000000l;
> if (remainingMs <= 0) {
> LOG.debug("timed out and hence returning progress log as NULL");
> return new JobProgressUpdate(ProgressMonitor.NULL);
> }
> Thread.sleep(Math.min(remainingMs, timeOutMs));
> timeOutMs <<= 1;
> }
> {code}
> After about 16 seconds of execution of the query, the timeOutMs is 16384 ms,
> which means the next sleep cycle is for min(30 - 17, 16) = 13.
> If the query finishes on the 17th second, the JDBC server will only respond
> after the 30th second when it will check for operation.isDone() and return.
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