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new 99c9c2ee3d4 [FLINK-27466][jdbc][docs] Clarify metaspace leak fix
99c9c2ee3d4 is described below
commit 99c9c2ee3d4cf15319ca9f97b61b18f3f3b23210
Author: Chesnay Schepler <[email protected]>
AuthorDate: Thu Jun 23 13:37:57 2022 +0200
[FLINK-27466][jdbc][docs] Clarify metaspace leak fix
---
docs/content.zh/docs/ops/debugging/debugging_classloading.md | 4 +++-
docs/content/docs/ops/debugging/debugging_classloading.md | 4 +++-
2 files changed, 6 insertions(+), 2 deletions(-)
diff --git a/docs/content.zh/docs/ops/debugging/debugging_classloading.md
b/docs/content.zh/docs/ops/debugging/debugging_classloading.md
index e08c9c0bf4d..c82026a5f7e 100644
--- a/docs/content.zh/docs/ops/debugging/debugging_classloading.md
+++ b/docs/content.zh/docs/ops/debugging/debugging_classloading.md
@@ -167,7 +167,9 @@ Common causes for class leaks and suggested fixes:
interners, or Avro's class/object caches in the serializers.
- *JDBC*: JDBC drivers leak references outside the user code classloader. To
ensure that these classes are only loaded once
- you should either add the driver jars to Flink's `lib/` folder, or add the
driver classes to the list of parent-first loaded class via
[`classloader.parent-first-patterns-additional`]({{< ref
"docs/deployment/config" >}}#classloader-parent-first-patterns-additional).
+ you should add the driver jars to Flink's `lib/` folder instead of bundling
them in the user-jar.
+ If you can't guarantee that none of your user-jars bundle the driver, you
have to additionally add the driver classes to the list of parent-first
+ loaded classes via [`classloader.parent-first-patterns-additional`]({{< ref
"docs/deployment/config" >}}#classloader-parent-first-patterns-additional).
A helpful tool for unloading dynamically loaded classes are the user code
class loader release hooks. These are hooks which are executed prior to the
unloading of a classloader. It is generally recommended to shutdown and unload
resources as part of the regular function lifecycle (typically the `close()`
methods). But in some cases (for example for static fields), it is better to
unload once a classloader is certainly not needed anymore.
diff --git a/docs/content/docs/ops/debugging/debugging_classloading.md
b/docs/content/docs/ops/debugging/debugging_classloading.md
index 7a65bff44c2..a5ad594e9d7 100644
--- a/docs/content/docs/ops/debugging/debugging_classloading.md
+++ b/docs/content/docs/ops/debugging/debugging_classloading.md
@@ -166,7 +166,9 @@ Common causes for class leaks and suggested fixes:
interners, or Avro's class/object caches in the serializers.
- *JDBC*: JDBC drivers leak references outside the user code classloader. To
ensure that these classes are only loaded once
- you should either add the driver jars to Flink's `lib/` folder, or add the
driver classes to the list of parent-first loaded class via
[`classloader.parent-first-patterns-additional`]({{< ref
"docs/deployment/config" >}}#classloader-parent-first-patterns-additional).
+ you should add the driver jars to Flink's `lib/` folder instead of bundling
them in the user-jar.
+ If you can't guarantee that none of your user-jars bundle the driver, you
have to additionally add the driver classes to the list of parent-first
+ loaded classes via [`classloader.parent-first-patterns-additional`]({{< ref
"docs/deployment/config" >}}#classloader-parent-first-patterns-additional).
A helpful tool for unloading dynamically loaded classes are the user code
class loader release hooks. These are hooks which are executed prior to the
unloading of a classloader. It is generally recommended to shutdown and unload
resources as part of the regular function lifecycle (typically the `close()`
methods). But in some cases (for example for static fields), it is better to
unload once a classloader is certainly not needed anymore.
