Github user greghogan commented on a diff in the pull request:
https://github.com/apache/flink/pull/4179#discussion_r124521762
--- Diff:
flink-libraries/flink-gelly-examples/src/main/java/org/apache/flink/graph/drivers/parameter/Parameter.java
---
@@ -40,6 +40,15 @@
String getUsage();
/**
+ * A hidden parameter is parsed from the command-line configuration but
is
+ * not printed in the usage string. This can be used for power-user
options
+ * not displayed to the general user.
--- End diff --
The initial use case was for disabling object reuse which a user should not
be concerned with (all the algorithms support object reuse) or even know about
but is used by the integration tests to validate the algorithms under object
reuse and for comparison benchmarking.
Another example is the next PR which hides the "algorithm" parallelism
which is only needed for large executions and might be confusing with the `-p`
"job" parallelism.
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