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From mwa...@apache.org
Subject [fluo-yarn] branch master updated: Fixes #3 Check if application is running before starting (#5)
Date Mon, 28 Aug 2017 14:43:24 GMT
This is an automated email from the ASF dual-hosted git repository.

mwalch pushed a commit to branch master
in repository https://gitbox.apache.org/repos/asf/fluo-yarn.git


The following commit(s) were added to refs/heads/master by this push:
     new 2e0266d  Fixes #3 Check if application is running before starting (#5)
2e0266d is described below

commit 2e0266de99000e827286a81f2c39576a68de5b39
Author: Mike Walch <mwalch@apache.org>
AuthorDate: Mon Aug 28 10:43:23 2017 -0400

    Fixes #3 Check if application is running before starting (#5)
    
    * Also improved README.md
---
 README.md                  | 15 +++++++++------
 distribution/bin/fluo-yarn |  5 +++++
 2 files changed, 14 insertions(+), 6 deletions(-)

diff --git a/README.md b/README.md
index 6d9604b..2080c7a 100644
--- a/README.md
+++ b/README.md
@@ -34,7 +34,7 @@ See the [related projects page][related] for external projects that may
help in
 
 ## Set up your Fluo application
 
-Before you can launch a Fluo application in YARN, you should follow Fluo's [install instructions][install]
+Before you can launch a Fluo application in YARN, you should follow Fluo's [install] and
[application] instructions
 to install Fluo and initialize a Fluo application. After your application has been initialized,
follow
 the insructions below to install the Fluo YARN launcher and run your application in YARN.
Avoid using the
 `fluo` command to start local oracle and worker processes if you are running in YARN.
@@ -82,7 +82,8 @@ After you obtain a Fluo YARN distribution tarball, follow these steps to
install
 
 ## Start Fluo application in YARN
 
-Follow the instructions below to start a Fluo application which contain an oracle and multiple
workers.
+Follow the instructions below to start your application in YARN. If you have not done so
already, you should [initialize
+your Fluo application][application] before following these instructions.
 
 1. Configure [fluo-yarn-env.sh] and [fluo-yarn.properties] if you have not already.
 
@@ -90,13 +91,14 @@ Follow the instructions below to start a Fluo application which contain
an oracl
 
         fluo-yarn start myapp conf/fluo-yarn.properties
 
-   The commands will retrieve your application configuration and observer jars (using your
-   application name) before starting the application in YARN.
+   The commands will retrieve your application configuration and observer jars (using your
application name) before
+   starting the application in YARN. The command will output a YARN application ID that can
be used to find your
+   application in the YARN resource manager and view its logs.
 
 ## Manage Fluo application in YARN
 
 Except for stopping your application in YARN, the `fluo` script can be used to manage your
application using the
-`scan` and `wait` commands.  See Fluo's [install instruction][install] for more information.
+`scan` and `wait` commands.  See [Fluo's application instructions][application] for more
information.
 
 When you want you stop your Fluo application, use the the YARN resource manager or the 
 `yarn application -kill <App ID>` to stop the application in YARN.
@@ -105,7 +107,8 @@ When you want you stop your Fluo application, use the the YARN resource
manager
 [YARN]: http://hadoop.apache.org/
 [related]: https://fluo.apache.org/related-projects/
 [related]: https://fluo.apache.org/related-projects/
-[install]: https://github.com/apache/incubator-fluo/blob/master/docs/install.md
+[install]: https://github.com/apache/fluo/blob/master/docs/install.md
+[application]: https://github.com/apache/fluo/blob/master/docs/applications.md
 [release]: https://fluo.apache.org/download/
 [fluo-yarn-env.sh]: distribution/conf/fluo-yarn-env.sh
 [fluo-yarn.properties]: distribution/conf/fluo-yarn.properties
diff --git a/distribution/bin/fluo-yarn b/distribution/bin/fluo-yarn
index 367dec4..5c78307 100755
--- a/distribution/bin/fluo-yarn
+++ b/distribution/bin/fluo-yarn
@@ -88,6 +88,11 @@ start)
     print_usage
     exit 1
   fi
+  app_status=$($FLUO_HOME/bin/fluo status $app)
+  if [[ "$app_status" == "RUNNING" ]]; then
+    echo "Fluo appplication '$app' is already running!"
+    exit 1
+  fi
   build_bundled_jar
   java org.apache.fluo.yarn.core.FluoYarnLauncher "$FLUO_CONN_PROPS" "$3" "$conf/log4j.properties"
"$app" "$app_dir/$bundled_jar"
   ;;

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