diff --git a/RELEASE.md b/RELEASE.md
index 7eabd06f88..e40951fb5f 100644
--- a/RELEASE.md
+++ b/RELEASE.md
@@ -9,6 +9,8 @@
    most likely you discovered a bug and should not use an f-string in the first
    place. If it is truly your intention to print the placeholder (not its
    resolved value) for debugging purposes, use `repr()` or `!r` instead.
+*  Execution parameters that serialize to larger than 262144 bytes are now
+   prohibited, and will cause an error during DSL compilation.
 
 ### For Pipeline Authors
 
@@ -224,7 +226,7 @@
 
 ## Bug Fixes and Other Changes
 
-*  Support to task type "workerpool1" of CLUSTER_SPEC in Vertex AI training's 
+*  Support to task type "workerpool1" of CLUSTER_SPEC in Vertex AI training's
    service according to the changes of task type in Tuner component.
 *  Propagates unexpected import failures in the public v1 module.
 
@@ -2887,4 +2889,4 @@ the 1.1.x release for TFX library.
 
 ### For component authors
 
-*   N/A
\ No newline at end of file
+*   N/A
diff --git a/tfx/dsl/compiler/compiler.py b/tfx/dsl/compiler/compiler.py
index e798b6930d..1fb5e5036c 100644
--- a/tfx/dsl/compiler/compiler.py
+++ b/tfx/dsl/compiler/compiler.py
@@ -37,6 +37,9 @@
 from tfx.utils import deprecation_utils
 from tfx.utils import name_utils
 
+# Maximum size of serialized parameter Value proto.
+_PARAMETER_VALUE_LIMIT = 2**20
+
 
 class Compiler:
   """Compiles a TFX pipeline or a component into a uDSL IR proto."""
@@ -485,6 +488,14 @@ def _set_node_parameters(node: pipeline_pb2.PipelineNode,
         raise ValueError(
             "Component {} got unsupported parameter {} with type {}.".format(
                 tfx_node.id, key, type(value))) from e
+      size = len(parameter_value.SerializeToString())
+      if size > _PARAMETER_VALUE_LIMIT:
+        raise ValueError(
+            "Component {} got parameter {} which is too big: it serializes to "
+            "{} bytes, which exceeds the limit of {}".format(
+                tfx_node.id, key, size, _PARAMETER_VALUE_LIMIT
+            )
+        )
 
 
 def _set_node_execution_options(