[jira] [Created] (FLINK-8856) Move all interrupt() calls to TaskCanceler

["Stephan Ewen (JIRA)" <ji...@apache.org>]

Stephan Ewen created FLINK-8856:
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             Summary: Move all interrupt() calls to TaskCanceler
                 Key: FLINK-8856
                 URL: https://issues.apache.org/jira/browse/FLINK-8856
             Project: Flink
          Issue Type: Bug
          Components: TaskManager
            Reporter: Stephan Ewen
             Fix For: 1.5.0


We need this to work around the following JVM bug: https://bugs.java.com/bugdatabase/view_bug.do?bug_id=8138622

To circumvent this problem, the {{TaskCancelerWatchDog}} must not call {{interrupt()}} at all, but only join on the executing thread (with timeout) and cause a hard exit once cancellation takes to long.

A user affected by this problem reported this in FLINK-8834

Personal note: The Thread.join(...) method unfortunately is not 100% reliable as well, because it uses {{System.currentTimeMillis()}} rather than {{System.nanoTime()}}. Because of that, sleeps can take overly long when the clock is adjusted. I wonder why the JDK authors do not follow their own recommendations and use {{System.nanoTime()}} for all relative time measures...



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