Hi Chesnay, Till, thanks for responding. @Chesnay: Apologies, I said cores when I meant slots ☺ So a total of 26 Task managers with 2 slots each for a grand total of 52 parallelism.
@Till: For this application, we have a grand total of 78 jobs, with some of them demanding more parallelism than others. Each job has multiple operators – depending on the size of the data we’re operating on, we could submit 1 whopper with 52 parallelism, or multiple smaller jobs submitted in parallel with a sum of 52 parallelism. When does a task submission to a `TaskExecutor` take place? Is that on job submission or something else? I’m just curious as a parallelism of 52 seems on the lower side to breach 1K connections in the queue, unless interactions with the Blobserver are much more frequent than I think. Is it possible that separate Flink jobs share the same Blobserver? Because we have thousands of Flink applications running concurrently in our YARN cluster. // ah From: Chesnay Schepler <ches...@apache.org> Sent: Thursday, October 1, 2020 5:42 AM To: Till Rohrmann <trohrm...@apache.org>; Hailu, Andreas [Engineering] <andreas.ha...@ny.email.gs.com> Cc: user@flink.apache.org Subject: Re: Blobserver dying mid-application It would also be good to know how many slots you have on each task executor. On 10/1/2020 11:21 AM, Till Rohrmann wrote: Hi Andreas, do the logs of the JM contain any information? Theoretically, each task submission to a `TaskExecutor` can trigger a new connection to the BlobServer. This depends a bit on how large your TaskInformation is and whether this information is being offloaded to the BlobServer. What you can definitely try to do is to increase the blob.fetch.backlog in order to see whether this solves the problem. How many jobs and in with what timeline do you submit them to the Flink cluster? Maybe you can share a bit more details about the application you are running. Cheers, Till On Wed, Sep 30, 2020 at 11:49 PM Hailu, Andreas <andreas.ha...@gs.com<mailto:andreas.ha...@gs.com>> wrote: Hello folks, I’m seeing application failures where our Blobserver is refusing connections mid application: 2020-09-30 13:56:06,227 INFO [flink-akka.actor.default-dispatcher-18] org.apache.flink.runtime.taskexecutor.TaskExecutor - Un-registering task and sending final execution state FINISHED to JobManager for task DataSink (TextOutputFormat (hdfs:/user/p2epda/lake/delp_prod/PROD/APPROVED/staging/datastore/MandateTradingLine/tmp_pipeline_collapse) - UTF-8) 3d1890b47f4398d805cf0c1b54286f71. 2020-09-30 13:56:06,423 INFO [flink-akka.actor.default-dispatcher-18] org.apache.flink.runtime.taskexecutor.slot.TaskSlotTable - Free slot TaskSlot(index:0, state:ACTIVE, resource profile: ResourceProfile{cpuCores=1.7976931348623157E308, heapMemoryInMB=2147483647, directMemoryInMB=2147483647, nativeMemoryInMB=2147483647, networkMemoryInMB=2147483647, managedMemoryInMB=3046}, allocationId: e8be16ec74f16c795d95b89cd08f5c37, jobId: e808de0373bd515224434b7ec1efe249). 2020-09-30 13:56:06,424 INFO [flink-akka.actor.default-dispatcher-18] org.apache.flink.runtime.taskexecutor.JobLeaderService - Remove job e808de0373bd515224434b7ec1efe249 from job leader monitoring. 2020-09-30 13:56:06,424 INFO [flink-akka.actor.default-dispatcher-18] org.apache.flink.runtime.taskexecutor.TaskExecutor - Close JobManager connection for job e808de0373bd515224434b7ec1efe249. 2020-09-30 13:56:06,426 INFO [flink-akka.actor.default-dispatcher-18] org.apache.flink.runtime.taskexecutor.TaskExecutor - Close JobManager connection for job e808de0373bd515224434b7ec1efe249. 2020-09-30 13:56:06,426 INFO [flink-akka.actor.default-dispatcher-18] org.apache.flink.runtime.taskexecutor.JobLeaderService - Cannot reconnect to job e808de0373bd515224434b7ec1efe249 because it is not registered. 2020-09-30 13:56:09,918 INFO [CHAIN DataSource (dataset | Read Staging From File System | AVRO) -> Map (Map at readAvroFileWithFilter(FlinkReadUtils.java:82)) -> Filter (Filter at validateData(DAXTask.java:97)) -> FlatMap (FlatMap at handleBloomFilter(PreMergeTask.java:187)) -> FlatMap (FlatMap at collapsePipelineIfRequired(Task.java:160)) (1/1)] org.apache.flink.runtime.blob.BlobClient - Downloading 48b8ba9f3de039f74483085f90e5ad64/p-0b27cb203799adb76d2a434ed3d64052d832cff3-6915d0cd0fef97f728cd890986b2bf39 from d43723-430.dc.gs.com/10.48.128.14:46473<http://d43723-430.dc.gs.com/10.48.128.14:46473> (retry 3) 2020-09-30 13:56:09,920 ERROR [CHAIN DataSource (dataset | Read Staging From File System | AVRO) -> Map (Map at readAvroFileWithFilter(FlinkReadUtils.java:82)) -> Filter (Filter at validateData(DAXTask.java:97)) -> FlatMap (FlatMap at handleBloomFilter(PreMergeTask.java:187)) -> FlatMap (FlatMap at collapsePipelineIfRequired(Task.java:160)) (1/1)] org.apache.flink.runtime.blob.BlobClient - Failed to fetch BLOB 48b8ba9f3de039f74483085f90e5ad64/p-0b27cb203799adb76d2a434ed3d64052d832cff3-6915d0cd0fef97f728cd890986b2bf39 from d43723-430.dc.gs.com/10.48.128.14:46473<http://d43723-430.dc.gs.com/10.48.128.14:46473> and store it under /fs/htmp/yarn/local/usercache/delp_prod/appcache/application_1599723434208_15328880/blobStore-e2888df1-c7be-4ce6-b6b6-58e7c24a140a/incoming/temp-00000004 Retrying... 2020-09-30 13:56:09,920 INFO [CHAIN DataSource (dataset | Read Staging From File System | AVRO) -> Map (Map at readAvroFileWithFilter(FlinkReadUtils.java:82)) -> Filter (Filter at validateData(DAXTask.java:97)) -> FlatMap (FlatMap at handleBloomFilter(PreMergeTask.java:187)) -> FlatMap (FlatMap at collapsePipelineIfRequired(Task.java:160)) (1/1)] org.apache.flink.runtime.blob.BlobClient - Downloading 48b8ba9f3de039f74483085f90e5ad64/p-0b27cb203799adb76d2a434ed3d64052d832cff3-6915d0cd0fef97f728cd890986b2bf39 from d43723-430.dc.gs.com/10.48.128.14:46473<http://d43723-430.dc.gs.com/10.48.128.14:46473> (retry 4) 2020-09-30 13:56:09,922 ERROR [CHAIN DataSource (dataset | Read Staging From File System | AVRO) -> Map (Map at readAvroFileWithFilter(FlinkReadUtils.java:82)) -> Filter (Filter at validateData(DAXTask.java:97)) -> FlatMap (FlatMap at handleBloomFilter(PreMergeTask.java:187)) -> FlatMap (FlatMap at collapsePipelineIfRequired(Task.java:160)) (1/1)] org.apache.flink.runtime.blob.BlobClient - Failed to fetch BLOB 48b8ba9f3de039f74483085f90e5ad64/p-0b27cb203799adb76d2a434ed3d64052d832cff3-6915d0cd0fef97f728cd890986b2bf39 from d43723-430.dc.gs.com/10.48.128.14:46473<http://d43723-430.dc.gs.com/10.48.128.14:46473> and store it under /fs/htmp/yarn/local/usercache/delp_prod/appcache/application_1599723434208_15328880/blobStore-e2888df1-c7be-4ce6-b6b6-58e7c24a140a/incoming/temp-00000004 Retrying... 2020-09-30 13:56:09,922 INFO [CHAIN DataSource (dataset | Read Staging From File System | AVRO) -> Map (Map at readAvroFileWithFilter(FlinkReadUtils.java:82)) -> Filter (Filter at validateData(DAXTask.java:97)) -> FlatMap (FlatMap at handleBloomFilter(PreMergeTask.java:187)) -> FlatMap (FlatMap at collapsePipelineIfRequired(Task.java:160)) (1/1)] org.apache.flink.runtime.blob.BlobClient - Downloading 48b8ba9f3de039f74483085f90e5ad64/p-0b27cb203799adb76d2a434ed3d64052d832cff3-6915d0cd0fef97f728cd890986b2bf39 from d43723-430.dc.gs.com/10.48.128.14:46473<http://d43723-430.dc.gs.com/10.48.128.14:46473> (retry 5) 2020-09-30 13:56:09,925 ERROR [CHAIN DataSource (dataset | Read Staging From File System | AVRO) -> Map (Map at readAvroFileWithFilter(FlinkReadUtils.java:82)) -> Filter (Filter at validateData(DAXTask.java:97)) -> FlatMap (FlatMap at handleBloomFilter(PreMergeTask.java:187)) -> FlatMap (FlatMap at collapsePipelineIfRequired(Task.java:160)) (1/1)] org.apache.flink.runtime.blob.BlobClient - Failed to fetch BLOB 48b8ba9f3de039f74483085f90e5ad64/p-0b27cb203799adb76d2a434ed3d64052d832cff3-6915d0cd0fef97f728cd890986b2bf39 from d43723-430.dc.gs.com/10.48.128.14:46473<http://d43723-430.dc.gs.com/10.48.128.14:46473> and store it under /fs/htmp/yarn/local/usercache/delp_prod/appcache/application_1599723434208_15328880/blobStore-e2888df1-c7be-4ce6-b6b6-58e7c24a140a/incoming/temp-00000004 No retries left. java.io.IOException: Could not connect to BlobServer at address d43723-430.dc.gs.com/10.48.128.14:46473<http://d43723-430.dc.gs.com/10.48.128.14:46473> at org.apache.flink.runtime.blob.BlobClient.<init>(BlobClient.java:100) at org.apache.flink.runtime.blob.BlobClient.downloadFromBlobServer(BlobClient.java:143) at org.apache.flink.runtime.blob.AbstractBlobCache.getFileInternal(AbstractBlobCache.java:181) at org.apache.flink.runtime.blob.PermanentBlobCache.getFile(PermanentBlobCache.java:202) at org.apache.flink.runtime.execution.librarycache.BlobLibraryCacheManager.registerTask(BlobLibraryCacheManager.java:120) at org.apache.flink.runtime.taskmanager.Task.createUserCodeClassloader(Task.java:915) at org.apache.flink.runtime.taskmanager.Task.doRun(Task.java:595) at org.apache.flink.runtime.taskmanager.Task.run(Task.java:530) at java.lang.Thread.run(Thread.java:745) Caused by: java.net.ConnectException: Connection refused (Connection refused) at java.net.PlainSocketImpl.socketConnect(Native Method) at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350) at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206) at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188) at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392) at java.net.Socket.connect(Socket.java:589) at org.apache.flink.runtime.blob.BlobClient.<init>(BlobClient.java:95) ... 8 more Prior to the above connection refused error, I don’t see any exceptions or failures. We’re running this application with v1.9.2 on YARN, 26 Task Managers with 2 cores each, and with the default BLOB server configurations. The application itself then has many jobs it submits to the cluster. Does this sound like a blob.fetch.backlog/concurrent-connections config problem (defaulted to 1000 and 50 respectively)? I wasn’t sure how chatty each TM is with the server. How can we tell if it’s either a max concurrent-conn or backlog problem? Best, Andreas ________________________________ Your Personal Data: We may collect and process information about you that may be subject to data protection laws. 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