[GitHub] [hadoop] aajisaka commented on a change in pull request #2327: HADOOP-17276. Extend CallerContext to make it include many items

[GitBox <gi...@apache.org>]

aajisaka commented on a change in pull request #2327:
URL: https://github.com/apache/hadoop/pull/2327#discussion_r498189901



##########
File path: hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/ipc/CallerContext.java
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@@ -114,6 +115,12 @@ public String toString() {
   /** The caller context builder. */
   public static final class Builder {
     private static final String KEY_VALUE_SEPARATOR = ":";
+    /**
+     * The illegal separators include '\t', '\n', '=', etc.
+     * User should not set illegal separator.
+     */
+    private static final List<String> ILLEGAL_SEPARATORS =
+        Arrays.asList("\t","\n","=");

Review comment:
       We should use `Collections.unmodifiableList` to provide an unmodifiable view.




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