JingsongLi commented on a change in pull request #10620:
[FLINK-15239][table-planner-blink] TM Metaspace memory leak
URL: https://github.com/apache/flink/pull/10620#discussion_r361248432
##########
File path:
flink-table/flink-table-runtime-blink/src/main/java/org/apache/flink/table/runtime/generated/CompileUtils.java
##########
@@ -45,7 +48,7 @@
* number of Meta zone GC (class unloading), resulting in performance
bottlenecks. So we add
* a cache to avoid this problem.
*/
- protected static final Cache<Tuple2<ClassLoader, String>, Class<?>>
COMPILED_CACHE = CacheBuilder
+ protected static final Cache<String, Cache<ClassLoader, Class>>
COMPILED_CACHE = CacheBuilder
.newBuilder()
.maximumSize(100) // estimated cache size
Review comment:
First, different tasks of one Job maybe have different class loader, so yes,
same code maybe have multiple Java Classes.
Second, same sql run in different client maybe generate same codes too.
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