Steven Zhen Wu created FLINK-18353: -------------------------------------- Summary: [1.11.0] maybe document jobmanager behavior change regarding -XX:MaxDirectMemorySize Key: FLINK-18353 URL: https://issues.apache.org/jira/browse/FLINK-18353 Project: Flink Issue Type: Improvement Components: Runtime / Configuration Affects Versions: 1.11.0 Reporter: Steven Zhen Wu
I know FLIP-116 (Unified Memory Configuration for Job Managers) is introduced in 1.11. That does cause a small behavior change regarding `-XX:MaxDirectMemorySize`. Previously, jobmanager JVM args don't set `-XX:MaxDirectMemorySize`, which means JVM can use up to -`Xmx` size. Now `-XX:MaxDirectMemorySize` is always set to {{[jobmanager.memory.off-heap.size|https://ci.apache.org/projects/flink/flink-docs-master/ops/config.html#jobmanager-memory-off-heap-size] config (default 128 mb). }} {{}} {{It is possible to get "java.lang.OufOfMemoryError: Direct Buffer Memory" without tuning }}{{[jobmanager.memory.off-heap.size|https://ci.apache.org/projects/flink/flink-docs-master/ops/config.html#jobmanager-memory-off-heap-size]}} especially for high-parallelism jobs. Previously, no tuning needed. Maybe we should point out the behavior change in the migration guide? [https://ci.apache.org/projects/flink/flink-docs-master/ops/memory/mem_migration.html#migrate-job-manager-memory-configuration] -- This message was sent by Atlassian Jira (v8.3.4#803005)