adoroszlai opened a new pull request #2853:
URL: https://github.com/apache/ozone/pull/2853
## What changes were proposed in this pull request?
Freon Datanode Chunk Generator fails with NPE in secure cluster. It is
should give a meaningful message about not being supported in secure cluster.
It seems this was broken in HDDS-4475.
```
$ cd hadoop-ozone/dist/target/ozone-*/compose/ozonesecure
$ docker-compose up -d --scale datanode=3
# wait
$ docker-compose exec scm ozone freon dcg -n1 -t1
...
java.lang.NullPointerException
at
com.google.common.base.Preconditions.checkNotNull(Preconditions.java:880)
at
org.apache.hadoop.hdds.scm.XceiverClientManager.<init>(XceiverClientManager.java:94)
at
org.apache.hadoop.hdds.scm.XceiverClientManager.<init>(XceiverClientManager.java:82)
at
org.apache.hadoop.ozone.freon.DatanodeChunkGenerator.call(DatanodeChunkGenerator.java:107)
at
org.apache.hadoop.ozone.freon.DatanodeChunkGenerator.call(DatanodeChunkGenerator.java:58)
```
https://issues.apache.org/jira/browse/HDDS-6011
## How was this patch tested?
```
$ cd hadoop-ozone/dist/target/ozone-*/compose/ozonesecure
$ docker-compose up -d --scale datanode=3
# wait
$ docker-compose exec scm ozone freon dcg -n1 -t1
...
Datanode chunk generator is not supported in secure environment
```
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