[flink] branch master updated: [hotfix][doc] Document union list metadata gotcha

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The following commit(s) were added to refs/heads/master by this push:
     new a2b669f  [hotfix][doc] Document union list metadata gotcha
a2b669f is described below

commit a2b669faabf372da7d5c8c0f100dac808f9b0821
Author: Jacob Sevart <js...@uber.com>
AuthorDate: Sat Mar 21 13:03:49 2020 -0700

    [hotfix][doc] Document union list metadata gotcha
    
    This closes #11475.
---
 docs/dev/stream/state/state.md | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/docs/dev/stream/state/state.md b/docs/dev/stream/state/state.md
index 028ad8f..e9869e7 100644
--- a/docs/dev/stream/state/state.md
+++ b/docs/dev/stream/state/state.md
@@ -567,7 +567,9 @@ the following redistribution schemes are defined:
     while `element2` will go to operator instance 1.
 
   - **Union redistribution:** Each operator returns a List of state elements. The whole state is logically a concatenation of
-    all lists. On restore/redistribution, each operator gets the complete list of state elements.
+    all lists. On restore/redistribution, each operator gets the complete list of state elements. Do not use this feature if
+    your list may have high cardinality. Checkpoint metadata will store an offset to each list entry, which could lead to RPC
+    framesize or out-of-memory errors.
 
 Below is an example of a stateful `SinkFunction` that uses `CheckpointedFunction`
 to buffer elements before sending them to the outside world. It demonstrates