[gobblin] branch master updated: [GOBBLIN-1514] Throw more useful error from already cancelled tasks (#3362)

[aplex]

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The following commit(s) were added to refs/heads/master by this push:
     new ba89b2b  [GOBBLIN-1514] Throw more useful error from already cancelled 
tasks (#3362)
ba89b2b is described below

commit ba89b2b85f767256f980e0ea7fea75d6a8c5fc81
Author: Jack Moseley <jmose...@linkedin.com>
AuthorDate: Thu Aug 12 11:17:16 2021 -0700

    [GOBBLIN-1514] Throw more useful error from already cancelled tasks (#3362)
    
    Currently sometimes when a task is attempted to be cancelled but is 
unsuccessful (due to helix being disconnected for example), the job will 
continue to run on the worker but the taskdriver will delete the jobState, 
causing an NPE here. This PR just throws a better error message, since the job 
is meant to be cancelled anyway.
---
 .../src/main/java/org/apache/gobblin/cluster/SingleTask.java          | 4 ++++
 1 file changed, 4 insertions(+)

diff --git 
a/gobblin-cluster/src/main/java/org/apache/gobblin/cluster/SingleTask.java 
b/gobblin-cluster/src/main/java/org/apache/gobblin/cluster/SingleTask.java
index b4397f1..93caab4 100644
--- a/gobblin-cluster/src/main/java/org/apache/gobblin/cluster/SingleTask.java
+++ b/gobblin-cluster/src/main/java/org/apache/gobblin/cluster/SingleTask.java
@@ -112,6 +112,10 @@ public class SingleTask {
   public void run()
       throws IOException, InterruptedException {
 
+    if (_jobState == null) {
+      throw new RuntimeException("jobState is null. Task may have already been 
cancelled.");
+    }
+
     // Add dynamic configuration to the job state
     _dynamicConfig.entrySet().forEach(e -> _jobState.setProp(e.getKey(), 
e.getValue().unwrapped().toString()));