[SPARK-28901][SQL] SparkThriftServer's Cancel SQL Operation show it in JDBC Tab UI #25611

AngersZhuuuu · 2019-08-28T15:29:12Z

What changes were proposed in this pull request?

Current Spark Thirft Server can't support cancel SQL job, when we use Hue to query throgh Spark Thrift Server, when we run a sql and then click cancel button to cancel this sql, we will it won't work in backend and in the spark JDBC UI tab, we can see the SQL's status is always COMPILED, then the duration of SQL is always increasing, this may make people confused.

Why are the changes needed?

If sql status can't reflect sql's true status, it will make user confused.

Does this PR introduce any user-facing change?

SparkthriftServer's UI tab will show SQL's status in CANCELED when we cancel a SQL .

How was this patch tested?

Manuel tested

UI TAB Status

backend log

AngersZhuuuu · 2019-08-29T03:48:26Z

gentl ping @juliuszsompolski @wangyum @srowen

juliuszsompolski

I was looking into it at some time in the past but never finished. Some comments about the various race conditions between the cancellation and the query thread that I considered.

...e-thriftserver/src/main/scala/org/apache/spark/sql/hive/thriftserver/HiveThriftServer2.scala

...r/src/main/scala/org/apache/spark/sql/hive/thriftserver/SparkExecuteStatementOperation.scala

juliuszsompolski · 2019-08-29T16:49:48Z

...e-thriftserver/src/main/scala/org/apache/spark/sql/hive/thriftserver/HiveThriftServer2.scala

+      synchronized {
+        executionList(id).finishTimestamp = System.currentTimeMillis
+        executionList(id).state = ExecutionState.CANCELED
+        totalRunning -= 1


It can happen that cancel() will race with query finishing, and then both onStatementCanceled() and onStatementFinish() will do totalRunning -= 1, resulting in negative count.

Instead of keeping a counter, for sessions and queries, it is better to do something like:

def getOnlineSessionNum: Int = synchronized { sessionList.count(_._2.finishTimestamp == 0) } def isExecutionActive(execInfo: ExecutionInfo): Boolean = { !(execInfo.state == ExecutionState.FAILED || execInfo.state == ExecutionState.CANCELED || execInfo.closeTimestamp != 0) } /** * When an error or a cancellation occurs, we set the finishTimestamp of the statement. * Therefore, when we count the number of running statements, we need to exclude errors and * cancellations and count all statements that have not been closed so far. */ def getTotalRunning: Int = synchronized { executionList.count { case (_, v) => isExecutionActive(v) } }

(Note that we should also consider statements that are CLOSED instead of FINISHED as not running anymore, because a FINISHED statement is still fetching results.)
(Same for sessions counters - though quite an obscure, there can be a race between a session timeout and a client closing session)

@juliuszsompolski if we call close() before FINISH, onOperationClose() won't do
totalRunning -= 1, also a bug.

@juliuszsompolski Can help to look at logic again

@AngersZhuuuu I think it's easy to get something wrong with the totalRunning counter. Even if we covered all the cases now, it's hard to reason about all the possible paths, and easy to break. I would suggest to count it on the fly based on status, like I proposed before.

def getOnlineSessionNum: Int = synchronized { sessionList.count(_._2.finishTimestamp == 0) } def isExecutionActive(execInfo: ExecutionInfo): Boolean = { !(execInfo.state == ExecutionState.FAILED || execInfo.state == ExecutionState.CANCELED || execInfo.closeTimestamp != 0) } /** * When an error or a cancellation occurs, we set the finishTimestamp of the statement. * Therefore, when we count the number of running statements, we need to exclude errors and * cancellations and count all statements that have not been closed so far. */ def getTotalRunning: Int = synchronized { executionList.count { case (_, v) => isExecutionActive(v) } }

def isExecutionActive(execInfo: ExecutionInfo): Boolean = {
!(execInfo.state == ExecutionState.FAILED ||
execInfo.state == ExecutionState.CANCELED ||
execInfo.state == ExecutionState.CLOSED)
}

make isExecutionActive() like this? to keep same code style

It can cover all situation, very good ideal

...r/src/main/scala/org/apache/spark/sql/hive/thriftserver/SparkExecuteStatementOperation.scala

AngersZhuuuu · 2019-08-30T04:21:38Z

@juliuszsompolski There are some conflicts in the process. Changed a lot to cover all problems you have mentioned， include call close()before setState FINISHED， Thanks for review again.

...r/src/main/scala/org/apache/spark/sql/hive/thriftserver/SparkExecuteStatementOperation.scala

juliuszsompolski · 2019-08-30T13:34:47Z

...r/src/main/scala/org/apache/spark/sql/hive/thriftserver/SparkExecuteStatementOperation.scala

    setState(OperationState.PENDING)
    setHasResultSet(true) // avoid no resultset for async run
+    statementId = UUID.randomUUID().toString
+    HiveThriftServer2.listener.onStatementPrepared(


I think it's enough to move onStatementStarted here, without adding Prepared as a separate state... I don't think there's much value added in distinguishing this from when the query starts running in the thread (it will go into a new state almost immediately after that)...

To not have to modify all these other operations, I would just stick with STARTED.

remove it. A little forgot why I do this, move onStatementStarted here is enough

...e-thriftserver/src/main/scala/org/apache/spark/sql/hive/thriftserver/HiveThriftServer2.scala

felixcheung · 2019-09-01T00:29:29Z

...e-thriftserver/src/main/scala/org/apache/spark/sql/hive/thriftserver/HiveThriftServer2.scala

      executionList(id).state = ExecutionState.CLOSED
+      if (lastState == ExecutionState.STARTED || lastState == ExecutionState.COMPILED) {
+        totalRunning -= 1
+      }


does FINISHED need to be handled somewhere?

does FINISHED need to be handled somewhere?

this place is to handle situation like : we have call close before finish, then the totalRunning value should -1 too. If we call cancel() or it finished, then when we call closeOperation, we won't do totalRunning -= 1. Since for FINISHED, has do totalRunning -= 1 , so here don't need to contain FINISHED

wangyum · 2019-09-02T13:55:27Z

ok to test

juliuszsompolski

Some more things that are not around a diffed line to anchor a comment to:

close() does sqlContext.sparkContext.clearJobGroup(), but that's incorrect because this is called from a different thread than execute which sets the JobGroup. Could you move it to a finally in execute?
In runInternal in the catch block in https://github.com/apache/spark/pull/25611/files#diff-72dcd8f81a51c8a815159fdf0332acdcR212 when it fails to launch the background thread, you should call HiveThriftServer2.listener.onStatementError to notify of the error in that case as well.
nit: We log query submission etc. with logInfo. I think for consistency we could change the log in close to logInfo as well.

juliuszsompolski · 2019-09-02T12:20:58Z

...r/src/main/scala/org/apache/spark/sql/hive/thriftserver/SparkExecuteStatementOperation.scala

+      // HiveServer will silently swallow them.
+      case e: Throwable =>
+        val currentState = getStatus().getState()
+        if (currentState.isTerminal) {


ocd nit: if (getStatus.getState.isTerminal) would make it consistent with other places in the file, and adding the val currentState now is not needed, as it's accessed only once anyway.

ocd nit: if (getStatus.getState.isTerminal) would make it consistent with other places in the file, and adding the val currentState now is not needed, as it's accessed only once anyway.

We should show currentState in

juliuszsompolski · 2019-09-02T13:34:07Z

...r/src/main/scala/org/apache/spark/sql/hive/thriftserver/SparkExecuteStatementOperation.scala

-    sqlContext.sparkContext.setJobGroup(statementId, statement)
    try {
+      logInfo(s"Running query '$statement' with $statementId")
+      setState(OperationState.RUNNING)


I'd change that to

synchronized { if (getStatus.getState.isTerminal) { logInfo(s"Query with $statementId in terminal state before it started running") return } else { logInfo(s"Running query with $statementId") setState(OperationState.RUNNING) } }

instead of the if in runInternal. Otherwise, it can still change the state to cancelled between there and here.
(note: removed $statement from the log message; let's log it during submission)

juliuszsompolski · 2019-09-02T13:45:58Z

...r/src/main/scala/org/apache/spark/sql/hive/thriftserver/SparkExecuteStatementOperation.scala

    setState(OperationState.PENDING)
    setHasResultSet(true) // avoid no resultset for async run
+    statementId = UUID.randomUUID().toString
+    HiveThriftServer2.listener.onStatementStart(


Could you add logInfo(s"Submitting query '$statement' with $statementId") here?

Could you add logInfo(s"Submitting query '$statement' with $statementId") here?

done

ocd formatting nit: move setHasResultSet(true) below statementid, logInfo and onStatementStart, to do all the initialization bookkeeping first.

juliuszsompolski · 2019-09-02T13:48:38Z

...r/src/main/scala/org/apache/spark/sql/hive/thriftserver/SparkExecuteStatementOperation.scala

-    cleanup(OperationState.CANCELED)
+    synchronized {
+      if (!getStatus.getState.isTerminal) {
+        logInfo(s"Cancel '$statement' with $statementId")


Could you do logInfo(s"Cancel query with $statementId")? I think it's enough to log the full statement at submission time.

juliuszsompolski · 2019-09-02T14:19:53Z

...r/src/main/scala/org/apache/spark/sql/hive/thriftserver/SparkExecuteStatementOperation.scala

+      if (!getStatus.getState.isTerminal) {
+        setState(OperationState.FINISHED)
+        HiveThriftServer2.listener.onStatementFinish(statementId)
+      }


nit: I think this could become a finally { synchronized { block; the if check will make sure that it doesn't go to finished after another state.

nit: I think this could become a finally { synchronized { block; the if check will make sure that it doesn't go to finished after another state.

Reasonable, I add too much control.

juliuszsompolski · 2019-09-02T14:57:51Z

...r/src/main/scala/org/apache/spark/sql/hive/thriftserver/SparkExecuteStatementOperation.scala

+          logWarning(s"Ignore exception in terminal state with $statementId: $e")
          return
        } else {
+          logError(s"Error executing query, currentState $currentState, ", e)


nit: Error executing query with $statementId

AngersZhuuuu · 2019-09-03T10:36:05Z

onStatementError needs to be added to these catch blocks, otherwise statement will be left in STARTED state.

New case, should do this.

juliuszsompolski

LGTM with ocd formatting nits

juliuszsompolski · 2019-09-03T13:18:23Z

...r/src/main/scala/org/apache/spark/sql/hive/thriftserver/SparkExecuteStatementOperation.scala

    (sqlContext: SQLContext, sessionToActivePool: JMap[SessionHandle, String])
  extends ExecuteStatementOperation(parentSession, statement, confOverlay, runInBackground)
-  with Logging {
+    with Logging {


nit: revert. https://github.com/databricks/scala-style-guide#spacing-and-indentation with shouldn't get extra indentation compared to extends

my local scala style may have some problem, not fit with that.

juliuszsompolski · 2019-09-03T13:19:23Z

...e-thriftserver/src/main/scala/org/apache/spark/sql/hive/thriftserver/HiveThriftServer2.scala

+    def onStatementError(
+        id: String,
+        errorMessage: String,
+        errorTrace: String): Unit = synchronized {


ocd nit: changing errorMessage to errorMsg would make it fit on one line.

juliuszsompolski · 2019-09-03T13:23:09Z

...r/src/main/scala/org/apache/spark/sql/hive/thriftserver/SparkExecuteStatementOperation.scala

+      Thread.currentThread().setContextClassLoader(executionHiveClassLoader)
+
+      sqlContext.sparkContext.setJobGroup(statementId, statement)
+


ocd nit: empty lines would be more readable if it was

... } // Always use the latest class loader provided by executionHive's state. val executionHiveClassLoader = sqlContext.sharedState.jarClassLoader Thread.currentThread().setContextClassLoader(executionHiveClassLoader) sqlContext.sparkContext.setJobGroup(statementId, statement) result = sqlContext.sql(statement) ...

it then separates the initialization part, the hive class loader part and the Spark part with empty lines.

Consider a lot , learn it.

juliuszsompolski · 2019-09-03T13:33:59Z

...r/src/main/scala/org/apache/spark/sql/hive/thriftserver/SparkExecuteStatementOperation.scala

        setBackgroundHandle(backgroundHandle)
      } catch {
        case rejected: RejectedExecutionException =>
+          logError("Error submit query in background, query rejected", rejected)


nit: "Error submit" -> "Error submitting"

juliuszsompolski · 2019-09-03T13:37:16Z

...r/src/main/scala/org/apache/spark/sql/hive/thriftserver/SparkExecuteStatementOperation.scala

+        if (currentState.isTerminal) {
+          // This may happen if the execution was cancelled, and then closed from another thread.
+          logWarning(s"Ignore exception in terminal state with $statementId: $e")
          return


nit: you either don't need the else or the return
I would keep the return and get rid of the else to save on indentation.

juliuszsompolski · 2019-09-03T13:41:23Z

...r/src/main/scala/org/apache/spark/sql/hive/thriftserver/SparkExecuteStatementOperation.scala

+    } finally {
+      synchronized {
+        setState(OperationState.FINISHED)
+        HiveThriftServer2.listener.onStatementFinish(statementId)


Missed it: You still need to wrap it in if (!currentState.isTerminal) { otherwise it will get executed in finally after e.g. an ERROR, or you can have a race condition with cancel/close.
When I wrote to put it in the finally block, I meant that then it could be together with clearJobGroup, but the if is still needed.

add if here is the most direct way, otherwise add too much control

juliuszsompolski · 2019-09-03T13:55:21Z

...r/src/main/scala/org/apache/spark/sql/hive/thriftserver/SparkExecuteStatementOperation.scala

    // RDDs will be cleaned automatically upon garbage collection.
    logDebug(s"CLOSING $statementId")
    cleanup(OperationState.CLOSED)
-    sqlContext.sparkContext.clearJobGroup()


Nit: make that logDebug logInfo(s"Closed statement with $statementId"), to make it consistent with other logs.

Nit: make that logDebug logInfo(s"Closed statement with $statementId"), to make it consistent with other logs.

maybe logInfo(s"Close statement with $statementId") ?

I'm fine with both Close and Closed. I see that you already committed Closed.

juliuszsompolski

LGTM. Thank you @AngersZhuuuu for bearing with all my comments! :-)

juliuszsompolski · 2019-09-03T19:36:06Z

...e-thriftserver/src/main/scala/org/apache/spark/sql/hive/thriftserver/HiveThriftServer2.scala

+      trimExecutionIfNecessary()
+    }
+
+


promise final nit: remove double empty line

juliuszsompolski · 2019-09-03T19:37:03Z

...r/src/main/scala/org/apache/spark/sql/hive/thriftserver/SparkExecuteStatementOperation.scala

    // RDDs will be cleaned automatically upon garbage collection.
    logDebug(s"CLOSING $statementId")
    cleanup(OperationState.CLOSED)
-    sqlContext.sparkContext.clearJobGroup()


I'm fine with both Close and Closed. I see that you already committed Closed.

AngersZhuuuu · 2019-09-03T22:52:23Z

@juliuszsompolski Thanks a lot for your review, this is the most deeply code review I have had， learn a lot from it. ，

gatorsmile · 2019-09-04T16:21:11Z

Thanks! Merged to master.

juliuszsompolski · 2019-09-06T21:43:37Z

...r/src/main/scala/org/apache/spark/sql/hive/thriftserver/SparkExecuteStatementOperation.scala

-          return
+      // Actually do need to catch Throwable as some failures don't inherit from Exception and
+      // HiveServer will silently swallow them.
+      case e: Throwable =>


@AngersZhuuuu
I think I found one more problem:
If cancel() and close() is called very quickly after the query is started, then they may both call cleanup() before Spark Jobs are started. Then sqlContext.sparkContext.cancelJobGroup(statementId) does nothing.
But then the execute thread can start the jobs, and only then get interrupted and exit through here. But then it will exit here, and no-one will cancel these jobs and they will keep running even though this execution has exited.

I think it can be fixed by:

case e: Throwable => // In any case, cancel any remaining running jobs. // E.g. a cancel() operation could have called cleanup() which canceled the Jobs before // they started. if (statementId != null) { sqlContext.sparkContext.cancelJobGroup(statementId) }

Got you point.
When cleanup().
SparkContext haven't setup jobGroup.
But execute thread start execute and setup jobGroup.
cleanup() can cancel background thread task but can't promise cancelJobGroup since it may be called before sparkContext setupJobGroup

But cancelJobGroup here seem can't stop execute() method run.

AngersZhuuuu · 2019-09-07T02:40:56Z

...r/src/main/scala/org/apache/spark/sql/hive/thriftserver/SparkExecuteStatementOperation.scala

+      // Always use the latest class loader provided by executionHive's state.
+      val executionHiveClassLoader = sqlContext.sharedState.jarClassLoader
+      Thread.currentThread().setContextClassLoader(executionHiveClassLoader)
+


@juliuszsompolski call cancel here for run statement in sync mode. seems can't stop task running .

AngersZhuuuu · 2019-09-07T02:45:26Z

...r/src/main/scala/org/apache/spark/sql/hive/thriftserver/SparkExecuteStatementOperation.scala

+      val executionHiveClassLoader = sqlContext.sharedState.jarClassLoader
+      Thread.currentThread().setContextClassLoader(executionHiveClassLoader)
+
+      sqlContext.sparkContext.setJobGroup(statementId, statement)


How about move judgement to this place . I think setState(RUNNING) after setJobGroup is ok.
Since we can think setClassLoader and setJobGroup is prepare work for running

sqlContext.sparkContext.setJobGroup(statementId, statement) synchronized { if (getStatus.getState.isTerminal) { logInfo(s"Query with $statementId in terminal state before it started running") return } else { logInfo(s"Running query with $statementId") setState(OperationState.RUNNING) } }

@AngersZhuuuu
I don't think it will help. It's not just about setJobGroup, but about actually starting the job. You can setJobGroup, then cancelJobGroup, and then start running Jobs in that Job Group.
What cancelJobGroup does is only cancel Jobs that are currently running in the Job group, it doesn't prevent further jobs being started. So I think it can still go past here, and then be cancelled before it actually starts the Jobs.
I think it would be safer to handle it from the catch block.

But when
You can setJobGroup, then cancelJobGroup, and then start running Jobs in that Job Group.
The job is under no JobGroup since when call cancelJobGroup, jobGroup in localProperties has been cleared

Let's have

Thread1 be in execute() after this synchronized block, but before the Jobs have started

Thread2 be a user connection calling cancel(). It cancels all jobs in the job group, and notifies Thread1

But before Thread1 gets the notification and throws InterruptedException, it starts some Jobs.

Then Thread1 gets InterruptedException, and exits through the catch and finally block. It does a clearJobGroup in the finally, but that doesn't cancel the Jobs started in 3. These Jobs keep running after Thread1 exits, and nobody cancels them.

I think that the only way to prevent this, is to call another cancelJobGroup from the catch block when an exception comes.

Get your point.
Cancel before setJobGroup, but there will be an interval between cancel and execute thread been interrupted. Then job won't be canceled after execute thread get into catch block.

…d interrupted ### What changes were proposed in this pull request? Discuss in #25611 If cancel() and close() is called very quickly after the query is started, then they may both call cleanup() before Spark Jobs are started. Then sqlContext.sparkContext.cancelJobGroup(statementId) does nothing. But then the execute thread can start the jobs, and only then get interrupted and exit through here. But then it will exit here, and no-one will cancel these jobs and they will keep running even though this execution has exited. So when execute() was interrupted by `cancel()`, when get into catch block, we should call canJobGroup again to make sure the job was canceled. ### Why are the changes needed? ### Does this PR introduce any user-facing change? NO ### How was this patch tested? MT Closes #25743 from AngersZhuuuu/SPARK-29036. Authored-by: angerszhu <[email protected]> Signed-off-by: Yuming Wang <[email protected]>

AngersZhuuuu added 2 commits August 28, 2019 23:19

[SPARK-28901] Support cancel SQL operation.

b84d385

commit code

07d5679

dongjoon-hyun added the SQL label Aug 28, 2019

AngersZhuuuu added 2 commits August 29, 2019 09:48

the same as other ethod

187a4a6

fix conflict between cancel and close status

44ba723

use old cancel method, a little mistake of code

e8f902e

AngersZhuuuu changed the title ~~[SPARK-28901][SQL] Support cancel SparkThriftServer's SQL Operation~~ [SPARK-28901][SQL] SparkThriftServer's Cancel SQL Operation show it in JDBC Tab UI Aug 29, 2019

juliuszsompolski reviewed Aug 29, 2019

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AngersZhuuuu added 8 commits August 30, 2019 10:52

fix call cancel before run execut()

d4d1943

remove dunplicated code

7d77b0c

fix throw exception

72b885d

close before cancel or finish, also reduce totalRunning

d2d6cc5

fix other operation

4c9d5f1

fix conflicts between cancel and finish

7b43b59

move try block to satrt of execute(0

3744fc9

fix scala style

5070161

fix code style

41ab7d7

juliuszsompolski reviewed Aug 30, 2019

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AngersZhuuuu added 3 commits August 31, 2019 00:23

fix error

87fa08f

remove PREPARED

63e8b59

remove empty line

bea260a

felixcheung reviewed Sep 1, 2019

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AngersZhuuuu added 4 commits September 2, 2019 17:53

fix scala style

7e56c14

remove sync operation judge terminal

8b25006

add empty line

ccd7de9

revert

c6651f1

juliuszsompolski reviewed Sep 2, 2019

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remove all the totalRunning and onlineSessionNum vars

28174bd

add onStatementError for background case

1cbf7cc

juliuszsompolski approved these changes Sep 3, 2019

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juliuszsompolski reviewed Sep 3, 2019

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fix code style

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juliuszsompolski reviewed Sep 3, 2019

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AngersZhuuuu added 2 commits September 3, 2019 21:56

to do all the initialization bookkeeping first.

f720963

fixlog

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juliuszsompolski approved these changes Sep 3, 2019

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code style fix

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gatorsmile closed this in 9f478a6 Sep 4, 2019

AngersZhuuuu mentioned this pull request Sep 5, 2019

[SPARK-28901][SQL][FLLOW-UP] SparkThriftServer's Cancel SQL Operation show it in JDBC Tab UI #25691

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juliuszsompolski reviewed Sep 6, 2019

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AngersZhuuuu commented Sep 7, 2019

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AngersZhuuuu mentioned this pull request Sep 10, 2019

[SPARK-29036][SQL]SparkThriftServer cancel job after execute() thread interrupted #25743

Closed

		Thread.currentThread().setContextClassLoader(executionHiveClassLoader)

		sqlContext.sparkContext.setJobGroup(statementId, statement)

[SPARK-28901][SQL] SparkThriftServer's Cancel SQL Operation show it in JDBC Tab UI #25611

[SPARK-28901][SQL] SparkThriftServer's Cancel SQL Operation show it in JDBC Tab UI #25611

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What changes were proposed in this pull request?

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Does this PR introduce any user-facing change?

How was this patch tested?

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