Hi Jan, So if I read your SO answer correctly and looking at the Github link you provided we are talking about ~100 consumers ? Since I am developing locally with a dockerized minimal Kafka broker it is possible that this is enough to hit the max open files limit.
Depending on your definition of “limited” I would say there are more than a limited number present at the same time. If you look at the below log extract everyone of those “Kafka version: 2.5.0” lines corresponds to a Kafka consumer instantiation and that’s within a very short period of time !! Thanks, Serge [INFO ] 2021-05-24 09:53:48.663 [direct-runner-worker] apache.kafka.common.utils.AppInfoParser$AppInfo - Kafka version: 2.5.0 [INFO ] 2021-05-24 09:53:48.688 [direct-runner-worker] apache.kafka.common.utils.AppInfoParser$AppInfo - Kafka version: 2.5.0 [INFO ] 2021-05-24 09:53:48.803 [direct-runner-worker] apache.kafka.common.utils.AppInfoParser$AppInfo - Kafka version: 2.5.0 [INFO ] 2021-05-24 09:53:48.815 [direct-runner-worker] apache.kafka.common.utils.AppInfoParser$AppInfo - Kafka version: 2.5.0 [INFO ] 2021-05-24 09:53:48.864 [direct-runner-worker] apache.kafka.common.utils.AppInfoParser$AppInfo - Kafka version: 2.5.0 [INFO ] 2021-05-24 09:53:48.871 [direct-runner-worker] apache.kafka.common.utils.AppInfoParser$AppInfo - Kafka version: 2.5.0 [INFO ] 2021-05-24 09:53:48.955 [direct-runner-worker] apache.kafka.common.utils.AppInfoParser$AppInfo - Kafka version: 2.5.0 [INFO ] 2021-05-24 09:53:48.969 [direct-runner-worker] apache.kafka.common.utils.AppInfoParser$AppInfo - Kafka version: 2.5.0 [INFO ] 2021-05-24 09:53:49.046 [direct-runner-worker] apache.kafka.common.utils.AppInfoParser$AppInfo - Kafka version: 2.5.0 [INFO ] 2021-05-24 09:53:49.052 [direct-runner-worker] apache.kafka.common.utils.AppInfoParser$AppInfo - Kafka version: 2.5.0 [INFO ] 2021-05-24 09:53:49.113 [direct-runner-worker] apache.kafka.common.utils.AppInfoParser$AppInfo - Kafka version: 2.5.0 [INFO ] 2021-05-24 09:53:49.128 [direct-runner-worker] apache.kafka.common.utils.AppInfoParser$AppInfo - Kafka version: 2.5.0 [INFO ] 2021-05-24 09:53:49.231 [direct-runner-worker] apache.kafka.common.utils.AppInfoParser$AppInfo - Kafka version: 2.5.0 [INFO ] 2021-05-24 09:53:49.236 [direct-runner-worker] apache.kafka.common.utils.AppInfoParser$AppInfo - Kafka version: 2.5.0 [INFO ] 2021-05-24 09:53:49.278 [direct-runner-worker] apache.kafka.common.utils.AppInfoParser$AppInfo - Kafka version: 2.5.0 [INFO ] 2021-05-24 09:53:49.281 [direct-runner-worker] apache.kafka.common.utils.AppInfoParser$AppInfo - Kafka version: 2.5.0 [INFO ] 2021-05-24 09:53:49.316 [direct-runner-worker] apache.kafka.common.utils.AppInfoParser$AppInfo - Kafka version: 2.5.0 [INFO ] 2021-05-24 09:53:49.321 [direct-runner-worker] apache.kafka.common.utils.AppInfoParser$AppInfo - Kafka version: 2.5.0 [INFO ] 2021-05-24 09:53:49.435 [direct-runner-worker] apache.kafka.common.utils.AppInfoParser$AppInfo - Kafka version: 2.5.0 [INFO ] 2021-05-24 09:53:49.444 [direct-runner-worker] apache.kafka.common.utils.AppInfoParser$AppInfo - Kafka version: 2.5.0 [INFO ] 2021-05-24 09:53:49.486 [direct-runner-worker] apache.kafka.common.utils.AppInfoParser$AppInfo - Kafka version: 2.5.0 [INFO ] 2021-05-24 09:53:49.494 [direct-runner-worker] apache.kafka.common.utils.AppInfoParser$AppInfo - Kafka version: 2.5.0 [INFO ] 2021-05-24 09:53:49.564 [direct-runner-worker] apache.kafka.common.utils.AppInfoParser$AppInfo - Kafka version: 2.5.0 [INFO ] 2021-05-24 09:53:49.575 [direct-runner-worker] apache.kafka.common.utils.AppInfoParser$AppInfo - Kafka version: 2.5.0 [INFO ] 2021-05-24 09:53:49.662 [direct-runner-worker] apache.kafka.common.utils.AppInfoParser$AppInfo - Kafka version: 2.5.0 [INFO ] 2021-05-24 09:53:49.668 [direct-runner-worker] apache.kafka.common.utils.AppInfoParser$AppInfo - Kafka version: 2.5.0 [INFO ] 2021-05-24 09:53:49.725 [direct-runner-worker] apache.kafka.common.utils.AppInfoParser$AppInfo - Kafka version: 2.5.0 [INFO ] 2021-05-24 09:53:49.730 [direct-runner-worker] apache.kafka.common.utils.AppInfoParser$AppInfo - Kafka version: 2.5.0 [INFO ] 2021-05-24 09:53:49.776 [direct-runner-worker] apache.kafka.common.utils.AppInfoParser$AppInfo - Kafka version: 2.5.0 [INFO ] 2021-05-24 09:53:49.782 [direct-runner-worker] apache.kafka.common.utils.AppInfoParser$AppInfo - Kafka version: 2.5.0 [INFO ] 2021-05-24 09:53:49.863 [direct-runner-worker] apache.kafka.common.utils.AppInfoParser$AppInfo - Kafka version: 2.5.0 [INFO ] 2021-05-24 09:53:49.876 [direct-runner-worker] apache.kafka.common.utils.AppInfoParser$AppInfo - Kafka version: 2.5.0 [INFO ] 2021-05-24 09:53:49.935 [direct-runner-worker] apache.kafka.common.utils.AppInfoParser$AppInfo - Kafka version: 2.5.0 [INFO ] 2021-05-24 09:53:49.940 [direct-runner-worker] apache.kafka.common.utils.AppInfoParser$AppInfo - Kafka version: 2.5.0 [INFO ] 2021-05-24 09:53:49.976 [direct-runner-worker] apache.kafka.common.utils.AppInfoParser$AppInfo - Kafka version: 2.5.0 [INFO ] 2021-05-24 09:53:49.979 [direct-runner-worker] apache.kafka.common.utils.AppInfoParser$AppInfo - Kafka version: 2.5.0 [INFO ] 2021-05-24 09:53:50.026 [direct-runner-worker] apache.kafka.common.utils.AppInfoParser$AppInfo - Kafka version: 2.5.0 [INFO ] 2021-05-24 09:53:50.038 [direct-runner-worker] apache.kafka.common.utils.AppInfoParser$AppInfo - Kafka version: 2.5.0 [INFO ] 2021-05-24 09:53:50.107 [direct-runner-worker] apache.kafka.common.utils.AppInfoParser$AppInfo - Kafka version: 2.5.0 [INFO ] 2021-05-24 09:53:50.130 [direct-runner-worker] apache.kafka.common.utils.AppInfoParser$AppInfo - Kafka version: 2.5.0 [INFO ] 2021-05-24 09:53:50.165 [direct-runner-worker] apache.kafka.common.utils.AppInfoParser$AppInfo - Kafka version: 2.5.0 [INFO ] 2021-05-24 09:53:50.169 [direct-runner-worker] apache.kafka.common.utils.AppInfoParser$AppInfo - Kafka version: 2.5.0 [INFO ] 2021-05-24 09:53:50.201 [direct-runner-worker] apache.kafka.common.utils.AppInfoParser$AppInfo - Kafka version: 2.5.0 [INFO ] 2021-05-24 09:53:50.205 [direct-runner-worker] apache.kafka.common.utils.AppInfoParser$AppInfo - Kafka version: 2.5.0 [INFO ] 2021-05-24 09:53:50.261 [direct-runner-worker] apache.kafka.common.utils.AppInfoParser$AppInfo - Kafka version: 2.5.0 [INFO ] 2021-05-24 09:53:50.276 [direct-runner-worker] apache.kafka.common.utils.AppInfoParser$AppInfo - Kafka version: 2.5.0 [INFO ] 2021-05-24 09:53:50.339 [direct-runner-worker] apache.kafka.common.utils.AppInfoParser$AppInfo - Kafka version: 2.5.0 [INFO ] 2021-05-24 09:53:50.343 [direct-runner-worker] apache.kafka.common.utils.AppInfoParser$AppInfo - Kafka version: 2.5.0 [INFO ] 2021-05-24 09:53:50.375 [direct-runner-worker] apache.kafka.common.utils.AppInfoParser$AppInfo - Kafka version: 2.5.0 [INFO ] 2021-05-24 09:53:50.378 [direct-runner-worker] apache.kafka.common.utils.AppInfoParser$AppInfo - Kafka version: 2.5.0 [INFO ] 2021-05-24 09:53:50.409 [direct-runner-worker] apache.kafka.common.utils.AppInfoParser$AppInfo - Kafka version: 2.5.0 [INFO ] 2021-05-24 09:53:50.417 [direct-runner-worker] apache.kafka.common.utils.AppInfoParser$AppInfo - Kafka version: 2.5.0 [INFO ] 2021-05-24 09:53:50.498 [direct-runner-worker] apache.kafka.common.utils.AppInfoParser$AppInfo - Kafka version: 2.5.0 [INFO ] 2021-05-24 09:53:50.509 [direct-runner-worker] apache.kafka.common.utils.AppInfoParser$AppInfo - Kafka version: 2.5.0 [INFO ] 2021-05-24 09:53:50.559 [direct-runner-worker] apache.kafka.common.utils.AppInfoParser$AppInfo - Kafka version: 2.5.0 [INFO ] 2021-05-24 09:53:50.562 [direct-runner-worker] apache.kafka.common.utils.AppInfoParser$AppInfo - Kafka version: 2.5.0 [INFO ] 2021-05-24 09:53:50.589 [direct-runner-worker] apache.kafka.common.utils.AppInfoParser$AppInfo - Kafka version: 2.5.0 [INFO ] 2021-05-24 09:53:50.591 [direct-runner-worker] apache.kafka.common.utils.AppInfoParser$AppInfo - Kafka version: 2.5.0 [INFO ] 2021-05-24 09:53:50.624 [direct-runner-worker] apache.kafka.common.utils.AppInfoParser$AppInfo - Kafka version: 2.5.0 [INFO ] 2021-05-24 09:53:50.628 [direct-runner-worker] apache.kafka.common.utils.AppInfoParser$AppInfo - Kafka version: 2.5.0 [INFO ] 2021-05-24 09:53:50.693 [direct-runner-worker] apache.kafka.common.utils.AppInfoParser$AppInfo - Kafka version: 2.5.0 [INFO ] 2021-05-24 09:53:50.704 [direct-runner-worker] apache.kafka.common.utils.AppInfoParser$AppInfo - Kafka version: 2.5.0 [INFO ] 2021-05-24 09:53:50.775 [direct-runner-worker] apache.kafka.common.utils.AppInfoParser$AppInfo - Kafka version: 2.5.0 [INFO ] 2021-05-24 09:53:50.778 [direct-runner-worker] apache.kafka.common.utils.AppInfoParser$AppInfo - Kafka version: 2.5.0 [INFO ] 2021-05-24 09:53:50.806 [direct-runner-worker] apache.kafka.common.utils.AppInfoParser$AppInfo - Kafka version: 2.5.0 [INFO ] 2021-05-24 09:53:50.808 [direct-runner-worker] apache.kafka.common.utils.AppInfoParser$AppInfo - Kafka version: 2.5.0 [INFO ] 2021-05-24 09:53:50.862 [direct-runner-worker] apache.kafka.common.utils.AppInfoParser$AppInfo - Kafka version: 2.5.0 [INFO ] 2021-05-24 09:53:50.870 [direct-runner-worker] apache.kafka.common.utils.AppInfoParser$AppInfo - Kafka version: 2.5.0 [INFO ] 2021-05-24 09:53:50.940 [direct-runner-worker] apache.kafka.common.utils.AppInfoParser$AppInfo - Kafka version: 2.5.0 [INFO ] 2021-05-24 09:53:50.950 [direct-runner-worker] apache.kafka.common.utils.AppInfoParser$AppInfo - Kafka version: 2.5.0 [INFO ] 2021-05-24 09:53:50.988 [direct-runner-worker] apache.kafka.common.utils.AppInfoParser$AppInfo - Kafka version: 2.5.0 [INFO ] 2021-05-24 09:53:50.990 [direct-runner-worker] apache.kafka.common.utils.AppInfoParser$AppInfo - Kafka version: 2.5.0 [INFO ] 2021-05-24 09:53:51.018 [direct-runner-worker] apache.kafka.common.utils.AppInfoParser$AppInfo - Kafka version: 2.5.0 [INFO ] 2021-05-24 09:53:51.020 [direct-runner-worker] apache.kafka.common.utils.AppInfoParser$AppInfo - Kafka version: 2.5.0 [INFO ] 2021-05-24 09:53:51.046 [direct-runner-worker] apache.kafka.common.utils.AppInfoParser$AppInfo - Kafka version: 2.5.0 [INFO ] 2021-05-24 09:53:51.048 [direct-runner-worker] apache.kafka.common.utils.AppInfoParser$AppInfo - Kafka version: 2.5.0 [INFO ] 2021-05-24 09:53:51.077 [direct-runner-worker] apache.kafka.common.utils.AppInfoParser$AppInfo - Kafka version: 2.5.0 [INFO ] 2021-05-24 09:53:51.083 [direct-runner-worker] apache.kafka.common.utils.AppInfoParser$AppInfo - Kafka version: 2.5.0 [INFO ] 2021-05-24 09:53:51.156 [direct-runner-worker] apache.kafka.common.utils.AppInfoParser$AppInfo - Kafka version: 2.5.0 [INFO ] 2021-05-24 09:53:51.167 [direct-runner-worker] apache.kafka.common.utils.AppInfoParser$AppInfo - Kafka version: 2.5.0 [INFO ] 2021-05-24 09:53:51.226 [direct-runner-worker] apache.kafka.common.utils.AppInfoParser$AppInfo - Kafka version: 2.5.0 [INFO ] 2021-05-24 09:53:51.232 [direct-runner-worker] apache.kafka.common.utils.AppInfoParser$AppInfo - Kafka version: 2.5.0 On 24 May 2021 at 09:35:50, Jan Lukavský (je...@seznam.cz) wrote: Hi Serge, I posted answer to the SO question, hope that helps. One question - a frequent creation of consumers should be expected with DirectRunner, but there should be only a limited number of them at a time. Do you see many of them present simultaneously? Or are they correctly closed and released? Jan On 5/23/21 8:40 AM, Sozonoff Serge wrote: Hi, I would like to refer to the following Stackoverflow issue I found. https://stackoverflow.com/questions/56496611/apache-beam-kafka-consumer-restarted-over-and-over-again#new-answer I have the very same issue when developing my Pipeline. Originally the pipeline was bound and would read and process a CSV where the name came from a parameter. Following some reading up on various patterns for being able to process a new incoming file automatically I added a KafkaIO read to the front of my pipeline to listen for messages which contain the name of a file to be processed and then I pass this on to FileIO etc …. As such my pipeline is now unbound. My pipeline fails using DirectRunner once we have reached the maximum number of open files!! Looking at the logging I see a very large number of threads (consumers) which seem to be connecting to the Kafka broker which makes no sense. I have a topic with a single partition! So literally 100’s of these. Notice the pool thread numbers and Consumer client id's [INFO ] 2021-05-23 08:37:56.511 [pool-82-thread-1] kafka.clients.consumer.internals.SubscriptionState - [Consumer clientId=consumer-Reader-0_offset_consumer_1203867505_report-processor--75, groupId=Reader-0_offset_consumer_1203867505_report-processor-] Seeking to LATEST offset of partition my_topic-0 ….. [INFO ] 2021-05-23 08:37:56.516 [pool-134-thread-1] kafka.clients.consumer.internals.SubscriptionState - [Consumer clientId=consumer-Reader-0_offset_consumer_1204976634_report-processor—127, groupId=Reader-0_offset_consumer_1204976634_report-processor-] Seeking to LATEST offset of partition my_topic-0 …. [INFO ] 2021-05-23 08:37:56.517 [pool-48-thread-1] kafka.clients.consumer.internals.SubscriptionState - [Consumer clientId=consumer-Reader-0_offset_consumer_283343789_report-processor--41, groupId=Reader-0_offset_consumer_283343789_report-processor-] Seeking to LATEST offset of partition my_topic-0 …. etc …. So my issue resembles the one which is described in the Stackoverflow and I can confirm that switching to a Flink runner resolves the problem but surely there is an explanation ? Is there a know bug with Direct Runner ? Kind thanks, Serge
