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https://issues.apache.org/jira/browse/SPARK-15905?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15328266#comment-15328266
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Shixiong Zhu commented on SPARK-15905:
--------------------------------------
Do you have a reproducer? What does your code look like?
> Driver hung while writing to console progress bar
> -------------------------------------------------
>
> Key: SPARK-15905
> URL: https://issues.apache.org/jira/browse/SPARK-15905
> Project: Spark
> Issue Type: Bug
> Components: Spark Core
> Affects Versions: 1.6.1
> Reporter: Tejas Patil
> Priority: Minor
>
> This leads to driver being not able to get heartbeats from its executors and
> job being stuck. After looking at the locking dependency amongst the driver
> threads per the jstack, this is where the driver seems to be stuck.
> {noformat}
> "refresh progress" #113 daemon prio=5 os_prio=0 tid=0x00007f7986cbc800
> nid=0x7887d runnable [0x00007f6d3507a000]
> java.lang.Thread.State: RUNNABLE
> at java.io.FileOutputStream.writeBytes(Native Method)
> at java.io.FileOutputStream.write(FileOutputStream.java:326)
> at
> java.io.BufferedOutputStream.flushBuffer(BufferedOutputStream.java:82)
> at java.io.BufferedOutputStream.flush(BufferedOutputStream.java:140)
> - locked <0x00007f6eb81dd290> (a java.io.BufferedOutputStream)
> at java.io.PrintStream.write(PrintStream.java:482)
> - locked <0x00007f6eb81dd258> (a java.io.PrintStream)
> at sun.nio.cs.StreamEncoder.writeBytes(StreamEncoder.java:221)
> at sun.nio.cs.StreamEncoder.implFlushBuffer(StreamEncoder.java:291)
> at sun.nio.cs.StreamEncoder.flushBuffer(StreamEncoder.java:104)
> - locked <0x00007f6eb81dd400> (a java.io.OutputStreamWriter)
> at java.io.OutputStreamWriter.flushBuffer(OutputStreamWriter.java:185)
> at java.io.PrintStream.write(PrintStream.java:527)
> - locked <0x00007f6eb81dd258> (a java.io.PrintStream)
> at java.io.PrintStream.print(PrintStream.java:669)
> at
> org.apache.spark.ui.ConsoleProgressBar.show(ConsoleProgressBar.scala:99)
> at
> org.apache.spark.ui.ConsoleProgressBar.org$apache$spark$ui$ConsoleProgressBar$$refresh(ConsoleProgressBar.scala:69)
> - locked <0x00007f6ed33b48a0> (a
> org.apache.spark.ui.ConsoleProgressBar)
> at
> org.apache.spark.ui.ConsoleProgressBar$$anon$1.run(ConsoleProgressBar.scala:53)
> at java.util.TimerThread.mainLoop(Timer.java:555)
> at java.util.TimerThread.run(Timer.java:505)
> {noformat}
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