Hi Gang, I’ve been trying to get some Flink code running in Amazon Web Services’s Elastic MapReduce, but so far the only success I’ve had required me to log into the master node, download my jar from S3 to there, and then run it on the master node from the command line using something like the following:
% bin/flink run -m yarn-cluster -yn 2 -p 4 <my jar name> <my main program arguments> The two other approaches I’ve tried (based on the AWS EMR Flink documentation <http://docs.aws.amazon.com/emr/latest/ReleaseGuide/emr-flink.html>) that didn’t work were: 1) Add an EMR Step to launch my program as part of a Flink session - I couldn’t figure out how to get my job jar deployed as part of the step, and I couldn’t successfully configure a Bootstrap Action <http://docs.aws.amazon.com/emr/latest/ManagementGuide/emr-plan-bootstrap.html#bootstrapCustom> to deploy it before running that step. 2) Start a Long-Running Flink Session via an EMR Step (which worked) and then use the Flink Web UI to upload my job jar from my workstation - It killed the ApplicationMaster that was running the Flink Web UI without providing much interesting logging. I’ve appended both the container log output and the jobmanager.log contents to the end of this email. In addition, it would be nice to gain access to S3 resources using credentials. I’ve tried using an AmazonS3ClientBuilder, and passing an EnvironmentVariableCredentialsProvider <http://docs.aws.amazon.com/AWSJavaSDK/latest/javadoc/com/amazonaws/auth/EnvironmentVariableCredentialsProvider.html> to its setCredentials method. I’d hoped that this might pick up the credentials I set up on my master node in the $AWS_ACCESS_KEY_ID and $AWS_SECRET_KEY environment variables I've exported, but I’m guessing that the shell this code is running in (on the slaves?) doesn’t have access to those variables. Here’s a list of interesting version numbers: flink-java-1.2.0.jar flink-core-1.2.0.jar flink-annotations-1.2.0.jar emr-5.4.0 with Flink 1.2.0 installed Any help would be greatly appreciated. I’m lusting after an example showing how to deploy a simple Flink jar from S3 to a running EMR cluster and then get Flink to launch it with an arbitrary set of Flink and user arguments. Bonus points for setting up an AmazonS3 Java client object without including those credentials within my Java source code. Best Regards, - Chris Here’s the container logging from my attempt to submit my job via the Flink web UI: Application application_1496707031947_0002 failed 1 times due to AM Container for appattempt_1496707031947_0002_000001 exited with exitCode: 255 For more detailed output, check application tracking page:http://ip-10-85-61-122.ec2.internal:8088/cluster/app/application_1496707031947_0002 <http://ip-10-85-61-122.ec2.internal:8088/cluster/app/application_1496707031947_0002> Then, click on links to logs of each attempt. Diagnostics: Exception from container-launch. Container id: container_1496707031947_0002_01_000001 Exit code: 255 Stack trace: ExitCodeException exitCode=255: at org.apache.hadoop.util.Shell.runCommand(Shell.java:582) at org.apache.hadoop.util.Shell.run(Shell.java:479) at org.apache.hadoop.util.Shell$ShellCommandExecutor.execute(Shell.java:773) at org.apache.hadoop.yarn.server.nodemanager.DefaultContainerExecutor.launchContainer(DefaultContainerExecutor.java:212) at org.apache.hadoop.yarn.server.nodemanager.containermanager.launcher.ContainerLaunch.call(ContainerLaunch.java:302) at org.apache.hadoop.yarn.server.nodemanager.containermanager.launcher.ContainerLaunch.call(ContainerLaunch.java:82) at java.util.concurrent.FutureTask.run(FutureTask.java:266) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) at java.lang.Thread.run(Thread.java:748) Container exited with a non-zero exit code 255 Failing this attempt. Failing the application. Application There's a bunch of startup messages in the jobmanager.log, but only the following output was generated by my attempt to submit my Flink job: 2017-06-06 00:41:55,332 INFO org.apache.flink.runtime.blob.BlobServer - Stopped BLOB server at 0.0.0.0:44948 2017-06-06 00:41:55,332 INFO org.apache.flink.runtime.webmonitor.WebRuntimeMonitor - Removing web dashboard root cache directory /tmp/flink-web-f3dde9b2-2384-49ce-b7a2-4c93bb1f5b6a 2017-06-06 00:41:55,336 INFO org.apache.flink.runtime.webmonitor.WebRuntimeMonitor - Removing web dashboard jar upload directory /tmp/flink-web-71b2e41d-b08d-43e8-bd0d-b6fb5cc329a2 ----------------------------------------- Chris Schneider http://www.scaleunlimited.com <http://www.scaleunlimited.com/> custom big data solutions -----------------------------------------
