Hey Shannon, good idea! We currently have this: https://ci.apache.org/projects/flink/flink-docs-release-1.3/ops/production_ready.html
It has a strong focus on managed state and not the points you mentioned. Would you like to create an issue for adding this to the production check list? I think it's valuable feedback. – Ufuk On Fri, Feb 17, 2017 at 7:24 PM, Shannon Carey <sca...@expedia.com> wrote: > A few of my jobs recently failed and showed this exception: > > > org.apache.flink.streaming.runtime.tasks.StreamTaskException: Cannot load > user class: org.apache.flink.streaming.connectors.kafka.FlinkKafkaConsumer09 > ClassLoader info: URL ClassLoader: > file: > '/tmp/blobStore-5f023409-6af5-4de6-8ed0-e80a2eb9633e/cache/blob_d9a9fb884f3b436030afcf7b8e1bce678acceaf2' > (invalid JAR: zip file is empty) > Class not resolvable through given classloader. > at > org.apache.flink.streaming.api.graph.StreamConfig.getStreamOperator(StreamConfig.java:208) > at > org.apache.flink.streaming.runtime.tasks.StreamTask.invoke(StreamTask.java:224) > at org.apache.flink.runtime.taskmanager.Task.run(Task.java:642) > at java.lang.Thread.run(Thread.java:745) > > > As you can see, Flink is storing things underneath /tmp, which is the > (undocumented) default for the blob store. As you may know, on Linux, > there's typically a program such as tmpwatch which is run periodically to > clear out data from /tmp. > > > Flink also uses /tmp as the default for jobmanager.web.tmpdir (and > jobmanager.web.upload.dir in 1.2). > > > Therefore, assuming that this is indeed the cause of the job failure/the > exception, it seems highly advisable that when you run a Flink cluster you > configure blob.storage.directory and jobmanager.web.tmpdir to a specific > folder that is not beneath /tmp. I don't know if there is any material about > setting up a production cluster, but this would definitely seem to be a > necessary configuration to specify if you want to avoid problems. Enabling > High Availability mode should also be on that list, I think. > > > -Shannon
