![]() ![]() The result could be the unexpected termination of the Java process. If the Java Virtual Machine does not take configured cgroup limits into account, it might risk trying to consume more resources than the operating system is willing to provide to it. When Java processes are deployed in such an environment, cgroup limits might be set for the deployed process. The Linux kernel ensures that when resource limits are in place via the cgroup, no process goes beyond those limits (at least not for extended periods of time). ![]() Container engine options, in turn, set resource limits via the Linux cgroup pseudo-filesystem. Those limits translate into options that are passed to the container engine when containers are deployed. Kubernetes and many other popular cloud orchestration systems let deployments limit container resources via CPU and memory quotas. OpenJDK container awareness has been available in Java 17 and Java 11 since their respective general availability (GA) releases, and in Java 8u starting with update 8u202. ![]() These resource limits affect, for example, the garbage collection (GC) algorithm selected by the JVM, the default size of the heap, the sizes of thread pools, and how default parallelism is determined for ForkJoinPool. OpenJDK detects whether certain resource quotas are in place when running in a container and, if so, uses those bounds for its operation. As of this writing, Java 17 and 11.0.16+ are the only long-term support releases that support both cgroups v1 and cgroups v2 configurations. OpenJDK's container awareness detection uses Linux's control group (cgroup) filesystem to detect enforced resource quotas. In this article, you'll learn why container awareness is useful, what has changed recently in that area of OpenJDK, and what diagnostic options are available to help developers gain insight into how the JVM determines settings. By container awareness, we mean that OpenJDK detects when it is running inside a container. If more information is required, I'll be glad to provide it.OpenJDK has been aware of Linux containers (such as Docker and Podman, as well as container orchestration frameworks such as Kubernetes) for some time. If anyone can tell me what I'm doing wrong, I would be very grateful. My xlog folder downsized to 50 files (800 mb), not anywhere near the 200 mb limit I set in the config. I then forced checkpoints through SQL, vacuumed the database, restarted the windows service and tried pg_archivecleanup, nothing really worked. I can see the properties have been set correctly when I query pg_settings. To reduce the size of the folder, I tried setting wal_keep_segments to 0 or 1, setting the max_wal_size to 200mb, reducing the checkpoint_timeout, setting archive_mode off and archive_command to an empty string. After the script is done, the database structure is fine, the data is there but the xlog folder already contains 55 files (880 mb). It executes initdb, registers a windows service, starts it, creates an empty database and restores a dump into the database. I wrote an setup script for my Postgresql 9.6 service instance. I've read a lot of threads about this issue or similar ones but nothing I've tried helped. I'm trying to configure a PostgreSQL 9.6 database to limit the size of the pg_xlog folder.
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