Siddharth Ahuja created YARN-10652:
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Summary: Capacity Scheduler fails to handle user weights for a
user that has a "." (dot) in it
Key: YARN-10652
URL: https://issues.apache.org/jira/browse/YARN-10652
Project: Hadoop YARN
Issue Type: Bug
Components: capacity scheduler
Affects Versions: 3.3.0
Reporter: Siddharth Ahuja
AD usernames can have a "." (dot) in them i.e. they can be of the format ->
{{firstname.lastname}}. However, if you specify a username with this format
against the Capacity Scheduler setting ->
{{yarn.scheduler.capacity.root.default.user-settings.firstname.lastname.weight}},
it fails to be applied and is instead assigned the default of 1.0f weight.
This renders the user weight feature (being used as a means of setting user
priorities for a queue) unusable for such users.
This limitation comes from [1]. From [1], only word characters (A word
character: [a-zA-Z_0-9]) (see [2]) are permissible at the moment which is no
good for AD names that contain a "." (dot).
Similar discussion has been had in a few HADOOP jiras e.g. HADOOP-7050 and
HADOOP-15395 and the outcome was to use non-whitespace characters i.e. instead
of {{\w+}}, use {{\S+}}.
We could go down similar path and unblock this feature for the AD usernames
with a "." (dot) in them.
[1]
https://github.com/apache/hadoop/blob/trunk/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/capacity/CapacitySchedulerConfiguration.java#L1953
[2]
https://docs.oracle.com/javase/tutorial/essential/regex/pre_char_classes.html
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