[flink] branch release-1.8 updated: [FLINK-14123][docs] Update release notes to contain warning about OOM

[tr...@apache.org]

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trohrmann pushed a commit to branch release-1.8
in repository https://gitbox.apache.org/repos/asf/flink.git


The following commit(s) were added to refs/heads/release-1.8 by this push:
     new c9002d2  [FLINK-14123][docs] Update release notes to contain warning about OOM
c9002d2 is described below

commit c9002d2b18501ed8dcccf0977c1baee3bd3af383
Author: Liupengcheng <li...@xiaomi.com>
AuthorDate: Mon Oct 21 13:47:48 2019 +0800

    [FLINK-14123][docs] Update release notes to contain warning about OOM
    
    This closes #9949.
---
 docs/release-notes/flink-1.8.md | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/docs/release-notes/flink-1.8.md b/docs/release-notes/flink-1.8.md
index c9fbdad..eee0360 100644
--- a/docs/release-notes/flink-1.8.md
+++ b/docs/release-notes/flink-1.8.md
@@ -203,4 +203,11 @@ see
 [here](/dev/stream/state/custom_serialization.html#implementing-a-compositetypeserializersnapshot)
 for instructions on using `CompositeTypeSerializerSnapshot`.
 
+### Memory management
+
+In Fink 1.8.0 and prior version, the managed memory fraction of taskmanager is controlled by `taskmanager.memory.fraction`,
+and with 0.7 as the default value. However, sometimes this will cause OOMs due to the fact that the default value of JVM
+parameter `NewRatio` is 2, which means the old generation occupied only 2/3 (0.66) of the heap memory. So if you run into
+this case, please manually change this value to a lower value.
+
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