HI Aljoscha, Thanks for the response.
To answer your question, the base path did not exist. But, I think I found the issue. I believe I had some rogue task managers running. As a troubleshooting step, I attempted to restart my cluster. However, after shutting down the cluster I noticed that there were still task managers running on most of my nodes (and on the master). Interestingly, on a second attempt to shut down the cluster, I received the message “No taskmanager daemon to stop on host…” for each of my nodes, even though I could see the flink processes running on these machines. After manually killing these processes and restarting the cluster, the problem went away. So, my assumption is that on a previous attempt to bounce the cluster, these processes did not shut down cleanly. Starting the cluster after that *may* have resulted in second instances of the task manager running on most nodes. I’m not certain, however, and I haven’t yet been able to reproduce the issue. From: Aljoscha Krettek <aljos...@apache.org> Reply-To: "user@flink.apache.org" <user@flink.apache.org> Date: Friday, October 14, 2016 at 6:57 PM To: "user@flink.apache.org" <user@flink.apache.org> Subject: Re: job failure with checkpointing enabled Hi, the file that Flink is trying to create there is not meant to be in the checkpointing location. It is a local file that is used for buffering elements until a checkpoint barrier arrives (for certain cases). Can you check whether the base path where it is trying to create that file exists? For the exception that you posted that would be: /tmp/flink-io-202fdf67-3f8c-47dd-8ebc-2265430644ed Cheers, Aljoscha On Fri, 14 Oct 2016 at 17:37 <robert.lancas...@hyatt.com<mailto:robert.lancas...@hyatt.com>> wrote: I recently tried enabling checkpointing in a job (that previously works w/o checkpointing) and received the following failure on job execution: java.io.FileNotFoundException: /tmp/flink-io-202fdf67-3f8c-47dd-8ebc-2265430644ed/a426eb27761575b3b79e464719bba96e16a1869d85bae292a2ef7eb72fa8a14c.0.buffer (No such file or directory) at java.io.RandomAccessFile.open0(Native Method) at java.io.RandomAccessFile.open(RandomAccessFile.java:316) at java.io.RandomAccessFile.<init>(RandomAccessFile.java:243) at org.apache.flink.streaming.runtime.io.BufferSpiller.createSpillingChannel(BufferSpiller.java:247) at org.apache.flink.streaming.runtime.io.BufferSpiller.<init>(BufferSpiller.java:117) at org.apache.flink.streaming.runtime.io.BarrierBuffer.<init>(BarrierBuffer.java:94) at org.apache.flink.streaming.runtime.io.StreamInputProcessor.<init>(StreamInputProcessor.java:96) at org.apache.flink.streaming.runtime.tasks.OneInputStreamTask.init(OneInputStreamTask.java:49) at org.apache.flink.streaming.runtime.tasks.StreamTask.invoke(StreamTask.java:239) at org.apache.flink.runtime.taskmanager.Task.run(Task.java:584) at java.lang.Thread.run(Thread.java:745) The job then restarts and fails again in an endless cycle. This feels like a configuration issue. My guess is that Flink is looking for the file above on local storage, though we’ve configured checkpointing to use hdfs (see below). To enable checkpointing, this is what I did: env.enableCheckpointing(3000l); Relevant configurations in flink-conf.yaml: state.backend: filesystem state.backend.fs.checkpointdir: hdfs://myhadoopnamenode:8020/apps/flink/checkpoints Note, the directory we’ve configured is not the same as the path indicated in the error. Interestingly, there are plenty of subdirs in my checkpoints directory, these appear to correspond to job start times, even though these jobs don’t have checkpointing enabled: drwxr-xr-x - rtap hdfs 0 2016-10-13 07:48 /apps/flink/checkpoints/b4870565f148cff10478dca8bff27bf7 drwxr-xr-x - rtap hdfs 0 2016-10-13 08:27 /apps/flink/checkpoints/044b21a0f252b6142e7ddfee7bfbd7d5 drwxr-xr-x - rtap hdfs 0 2016-10-13 08:36 /apps/flink/checkpoints/a658b23c2d2adf982a2cf317bfb3d3de drwxr-xr-x - rtap hdfs 0 2016-10-14 07:38 /apps/flink/checkpoints/1156bd1796105ad95a8625cb28a0b816 drwxr-xr-x - rtap hdfs 0 2016-10-14 07:41 /apps/flink/checkpoints/58fdd94b7836a3b3ed9abc5c8f3a1dd5 drwxr-xr-x - rtap hdfs 0 2016-10-14 07:43 /apps/flink/checkpoints/47a849a8ed6538b9e7d3826a628d38b9 drwxr-xr-x - rtap hdfs 0 2016-10-14 07:49 /apps/flink/checkpoints/e6a9e2300ea5c36341fa160adab789f0 Thanks! ________________________________ The information contained in this communication is confidential and intended only for the use of the recipient named above, and may be legally privileged and exempt from disclosure under applicable law. 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