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Posted to jira@kafka.apache.org by "Bruno Cadonna (Jira)" <ji...@apache.org> on 2020/05/12 12:08:00 UTC
[jira] [Assigned] (KAFKA-9603) Number of open files keeps
increasing in Streams application
[ https://issues.apache.org/jira/browse/KAFKA-9603?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Bruno Cadonna reassigned KAFKA-9603:
------------------------------------
Assignee: Bruno Cadonna
> Number of open files keeps increasing in Streams application
> ------------------------------------------------------------
>
> Key: KAFKA-9603
> URL: https://issues.apache.org/jira/browse/KAFKA-9603
> Project: Kafka
> Issue Type: Bug
> Components: streams
> Affects Versions: 2.1.0, 2.2.0, 2.4.0, 2.3.1
> Environment: Spring Boot 2.2.4, OpenJDK 13, Centos image
> Reporter: Bruno Iljazovic
> Assignee: Bruno Cadonna
> Priority: Major
>
> Problem appeared when upgrading from *2.0.1* to *2.3.1*.
> Relevant Kafka Streams code:
> {code:java}
> KStream<String, Event1> events1 =
> builder.stream(FIRST_TOPIC_NAME, Consumed.with(stringSerde, event1Serde, event1TimestampExtractor(), null))
> .mapValues(...);
> KStream<String, Event2> events2 =
> builder.stream(SECOND_TOPIC_NAME, Consumed.with(stringSerde, event2Serde, event2TimestampExtractor(), null))
> .mapValues(...);
> var joinWindows = JoinWindows.of(Duration.of(1, MINUTES).toMillis())
> .until(Duration.of(1, HOURS).toMillis());
> events2.join(events1, this::join, joinWindows, Joined.with(stringSerde, event2Serde, event1Serde))
> .foreach(...);
> {code}
> Number of open *.sst files keeps increasing until eventually it hits the os limit (65536) and causes this exception:
> {code:java}
> Caused by: org.rocksdb.RocksDBException: While open a file for appending: /.../0_8/KSTREAM-JOINOTHER-0000000010-store/KSTREAM-JOINOTHER-0000000010-store.1579435200000/001354.sst: Too many open files
> at org.rocksdb.RocksDB.flush(Native Method)
> at org.rocksdb.RocksDB.flush(RocksDB.java:2394)
> {code}
> Here are example files that are opened and never closed:
> {code:java}
> /.../0_27/KSTREAM-JOINTHIS-0000000009-store/KSTREAM-JOINTHIS-0000000009-store.1582459200000/000114.sst
> /.../0_27/KSTREAM-JOINOTHER-0000000010-store/KSTREAM-JOINOTHER-0000000010-store.1582459200000/000065.sst
> /.../0_29/KSTREAM-JOINTHIS-0000000009-store/KSTREAM-JOINTHIS-0000000009-store.1582156800000/000115.sst
> /.../0_29/KSTREAM-JOINTHIS-0000000009-store/KSTREAM-JOINTHIS-0000000009-store.1582459200000/000112.sst
> /.../0_31/KSTREAM-JOINTHIS-0000000009-store/KSTREAM-JOINTHIS-0000000009-store.1581854400000/000051.sst
> {code}
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