[jira] [Created] (HDDS-4289) Throw exception from hadoop2 filesystem jar in HA environment

["Marton Elek (Jira)" <ji...@apache.org>]

Marton Elek created HDDS-4289:
---------------------------------

             Summary: Throw exception from hadoop2 filesystem jar in HA environment
                 Key: HDDS-4289
                 URL: https://issues.apache.org/jira/browse/HDDS-4289
             Project: Hadoop Distributed Data Store
          Issue Type: Bug
          Components: OM HA
            Reporter: Marton Elek


Thanks for Tamas Pleszkan for reporting this problem.

ozone-filesystem-hadoop2 doesn't support OM-HA (today) as the used Hadoop3OmTransport uses FailoverProxyProvider which is not available in hadoop2.

Long-term we need a custom failover mechanism, but this jira suggests to improve the error handling. `Hadoop27OmTransportFactory` should throw an exception if HA is used.

Used command:

{code}
spark-submit --master yarn --deploy-mode client --executor-memory 1g --conf "spark.yarn.access.hadoopFileSystems=o3fs://bucket.hdfs.ozone1/" --jars "/opt/cloudera/parcels/CDH-7.1.3-1.cdh7.1.3.p0.4992530/jars/hadoop-ozone-filesystem-hadoop2-0.5.0.7.1.3.0-100.jar" SparkWordCount.py o3fs://bucket.hdfs.ozone1/words 2
{code}

Current exception:

{code}
Caused by: org.apache.hadoop.ipc.RemoteException(org.apache.hadoop.ozone.om.exceptions.OMNotLeaderException): OM:om2 is not the leader. Suggested leader is OM:om1.
{code}

Expected exception: Unsupported operation exception with meaningful hint to use hadoop3 filesystem jar.



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