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From bchamb...@apache.org
Subject [1/2] incubator-beam git commit: Return from awaitCompletion if Already Done
Date Mon, 06 Jun 2016 17:39:46 GMT
Repository: incubator-beam
Updated Branches:
  refs/heads/master c2146b9f9 -> c0b67ab12


Return from awaitCompletion if Already Done

This ensures that a call to ExecutorService#awaitCompletion returns immediately
if there are no visible updates and the executor has completed. If the executor is
in this state, no additional visible updates will be published and the call will hang.

This sequence generally will not happen, as calls via InProcessPipelineResult
return if the state is already terminal, but this ensures that parallel calls to
awaitCompletion do not hang one calling thread.


Project: http://git-wip-us.apache.org/repos/asf/incubator-beam/repo
Commit: http://git-wip-us.apache.org/repos/asf/incubator-beam/commit/ebb69320
Tree: http://git-wip-us.apache.org/repos/asf/incubator-beam/tree/ebb69320
Diff: http://git-wip-us.apache.org/repos/asf/incubator-beam/diff/ebb69320

Branch: refs/heads/master
Commit: ebb69320037fda48df5e6ca24ecc9415a4b2acb4
Parents: c2146b9
Author: Thomas Groh <tgroh@users.noreply.github.com>
Authored: Mon May 30 11:04:15 2016 -0700
Committer: bchambers <bchambers@google.com>
Committed: Mon Jun 6 10:09:47 2016 -0700

----------------------------------------------------------------------
 .../runners/direct/ExecutorServiceParallelExecutor.java  | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)
----------------------------------------------------------------------


http://git-wip-us.apache.org/repos/asf/incubator-beam/blob/ebb69320/runners/direct-java/src/main/java/org/apache/beam/runners/direct/ExecutorServiceParallelExecutor.java
----------------------------------------------------------------------
diff --git a/runners/direct-java/src/main/java/org/apache/beam/runners/direct/ExecutorServiceParallelExecutor.java
b/runners/direct-java/src/main/java/org/apache/beam/runners/direct/ExecutorServiceParallelExecutor.java
index a627125..3129145 100644
--- a/runners/direct-java/src/main/java/org/apache/beam/runners/direct/ExecutorServiceParallelExecutor.java
+++ b/runners/direct-java/src/main/java/org/apache/beam/runners/direct/ExecutorServiceParallelExecutor.java
@@ -200,11 +200,16 @@ final class ExecutorServiceParallelExecutor implements InProcessExecutor
{
   public void awaitCompletion() throws Throwable {
     VisibleExecutorUpdate update;
     do {
-      update = visibleUpdates.take();
-      if (update.throwable.isPresent()) {
+      // Get an update; don't block forever if another thread has handled it
+      update = visibleUpdates.poll(2L, TimeUnit.SECONDS);
+      if (update == null && executorService.isShutdown()) {
+        // there are no updates to process and no updates will ever be published because
the
+        // executor is shutdown
+        return;
+      } else if (update != null && update.throwable.isPresent()) {
         throw update.throwable.get();
       }
-    } while (!update.isDone());
+    } while (update == null || !update.isDone());
     executorService.shutdown();
   }
 


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