Dénes Bodó created HADOOP-19118:
-----------------------------------
Summary: KeyShell fails with NPE when KMS throws Exception with
null as message
Key: HADOOP-19118
URL: https://issues.apache.org/jira/browse/HADOOP-19118
Project: Hadoop Common
Issue Type: Bug
Components: common, crypto
Affects Versions: 3.3.6
Reporter: Dénes Bodó
There is an issue in specific Ranger version where RANGER-3989 which throws
Exception in case of concurrent access to a HashMap with Message {*}null{*}.
{noformat}
java.util.ConcurrentModificationException: null
at java.util.HashMap$HashIterator.nextNode(HashMap.java:1469)
at java.util.HashMap$EntryIterator.next(HashMap.java:1503)
at java.util.HashMap$EntryIterator.next(HashMap.java:1501) {noformat}
This manifests in Hadoop's KeyShell as an Exception with message {*}null{*}.
So when
{code:java}
private String prettifyException(Exception e) {
return e.getClass().getSimpleName() + ": " +
e.getLocalizedMessage().split("\n")[0];
} {code}
tries to print out the Exception the user experiences NPE
{noformat}
Exception in thread "main" java.lang.NullPointerException
at
org.apache.hadoop.crypto.key.KeyShell.prettifyException(KeyShell.java:541)
at
org.apache.hadoop.crypto.key.KeyShell.printException(KeyShell.java:536)
at org.apache.hadoop.tools.CommandShell.run(CommandShell.java:79)
at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:81)
at org.apache.hadoop.crypto.key.KeyShell.main(KeyShell.java:553)
{noformat}
This is an unwanted behaviour because the user does not have any feedback what
and where went wrong.
My suggestion is to add *null checking* into the affected *prettifyException*
method.
I'll create the Github PR soon.
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