Cheolsoo Park created SPARK-6954:
------------------------------------
Summary: Dynamic allocation: numExecutorsPending in
ExecutorAllocationManager should never become negative
Key: SPARK-6954
URL: https://issues.apache.org/jira/browse/SPARK-6954
Project: Spark
Issue Type: Bug
Components: YARN
Affects Versions: 1.3.0
Reporter: Cheolsoo Park
Priority: Minor
I have a simple test case for dynamic allocation on YARN that fails with the
following stack trace-
{code}
15/04/16 00:52:14 ERROR Utils: Uncaught exception in thread
spark-dynamic-executor-allocation-0
java.lang.IllegalArgumentException: Attempted to request a negative number of
executor(s) -21 from the cluster manager. Please specify a positive number!
at
org.apache.spark.scheduler.cluster.CoarseGrainedSchedulerBackend.requestTotalExecutors(CoarseGrainedSchedulerBackend.scala:338)
at
org.apache.spark.SparkContext.requestTotalExecutors(SparkContext.scala:1137)
at
org.apache.spark.ExecutorAllocationManager.addExecutors(ExecutorAllocationManager.scala:294)
at
org.apache.spark.ExecutorAllocationManager.addOrCancelExecutorRequests(ExecutorAllocationManager.scala:263)
at
org.apache.spark.ExecutorAllocationManager.org$apache$spark$ExecutorAllocationManager$$schedule(ExecutorAllocationManager.scala:230)
at
org.apache.spark.ExecutorAllocationManager$$anon$1$$anonfun$run$1.apply$mcV$sp(ExecutorAllocationManager.scala:189)
at
org.apache.spark.ExecutorAllocationManager$$anon$1$$anonfun$run$1.apply(ExecutorAllocationManager.scala:189)
at
org.apache.spark.ExecutorAllocationManager$$anon$1$$anonfun$run$1.apply(ExecutorAllocationManager.scala:189)
at org.apache.spark.util.Utils$.logUncaughtExceptions(Utils.scala:1618)
at
org.apache.spark.ExecutorAllocationManager$$anon$1.run(ExecutorAllocationManager.scala:189)
at
java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:304)
at
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:178)
at
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:745)
{code}
My test is as follows-
# Start spark-shell with a single executor.
# Run a {{select count(\*)}} query. The number of executors rises as input size
is non-trivial.
# After the job finishes, the number of executors falls as most of them become
idle.
# Rerun the same query again, and it fails with the following error-
In fact, this error only happens when I configure {{executorIdleTimeout}} very
small. For eg, I can reproduce it with the following configs-
{code}
spark.dynamicAllocation.executorIdleTimeout 5
spark.dynamicAllocation.schedulerBacklogTimeout 5
{code}
Although I can simply increase {{executorIdleTimeout}} to something like 60
secs to avoid the error, I think this is still a bug to be fixed.
The root cause seems that {{numExecutorsPending}} accidentally becomes negative
if executors are killed too aggressively (i.e. {{executorIdleTimeout}} is too
small) because under that circumstance, the new target # of executors can be
smaller than the current # of executors. When that happens,
{{ExecutorAllocationManager}} ends up trying to add a negative number of
executors, which throws an exception.
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
---------------------------------------------------------------------
To unsubscribe, e-mail: issues-unsubscr...@spark.apache.org
For additional commands, e-mail: issues-h...@spark.apache.org
