[FLINK-3813][yarn] wait for CLI to complete before checking output

This closes #2749.


Project: http://git-wip-us.apache.org/repos/asf/flink/repo
Commit: http://git-wip-us.apache.org/repos/asf/flink/commit/e4807621
Tree: http://git-wip-us.apache.org/repos/asf/flink/tree/e4807621
Diff: http://git-wip-us.apache.org/repos/asf/flink/diff/e4807621

Branch: refs/heads/master
Commit: e4807621b8f41fc4f9fa69f423f1fbf7bba05218
Parents: 1c0c668
Author: Maximilian Michels <[email protected]>
Authored: Wed Oct 26 16:37:56 2016 +0100
Committer: Maximilian Michels <[email protected]>
Committed: Fri Nov 4 20:07:42 2016 +0100

----------------------------------------------------------------------
 .../java/org/apache/flink/yarn/YARNSessionFIFOITCase.java     | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)
----------------------------------------------------------------------


http://git-wip-us.apache.org/repos/asf/flink/blob/e4807621/flink-yarn-tests/src/test/java/org/apache/flink/yarn/YARNSessionFIFOITCase.java
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diff --git 
a/flink-yarn-tests/src/test/java/org/apache/flink/yarn/YARNSessionFIFOITCase.java
 
b/flink-yarn-tests/src/test/java/org/apache/flink/yarn/YARNSessionFIFOITCase.java
index c5659eb..68cc73d 100644
--- 
a/flink-yarn-tests/src/test/java/org/apache/flink/yarn/YARNSessionFIFOITCase.java
+++ 
b/flink-yarn-tests/src/test/java/org/apache/flink/yarn/YARNSessionFIFOITCase.java
@@ -81,10 +81,11 @@ public class YARNSessionFIFOITCase extends YarnTestBase {
         * Test regular operation, including command line parameter parsing.
         */
        @Test(timeout=60000) // timeout after a minute.
-       public void testDetachedMode() {
+       public void testDetachedMode() throws InterruptedException {
                LOG.info("Starting testDetachedMode()");
                addTestAppender(FlinkYarnSessionCli.class, Level.INFO);
-               startWithArgs(new String[]{"-j", flinkUberjar.getAbsolutePath(),
+               Runner runner =
+                       startWithArgs(new String[]{"-j", 
flinkUberjar.getAbsolutePath(),
                                                "-t", 
flinkLibFolder.getAbsolutePath(),
                                                "-n", "1",
                                                "-jm", "768",
@@ -93,6 +94,8 @@ public class YARNSessionFIFOITCase extends YarnTestBase {
                                                "--detached"},
                                "Flink JobManager is now running on", 
RunTypes.YARN_SESSION);
 
+               // before checking any strings outputted by the CLI, first give 
it time to return
+               runner.join();
                checkForLogString("The Flink YARN client has been started in 
detached mode");
 
                LOG.info("Waiting until two containers are running");

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