Attila Doroszlai created HDDS-4525:
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Summary: Deprecate Hadoop variables and functions in shell scripts
Key: HDDS-4525
URL: https://issues.apache.org/jira/browse/HDDS-4525
Project: Hadoop Distributed Data Store
Issue Type: Improvement
Components: Ozone CLI
Reporter: Attila Doroszlai
Assignee: Attila Doroszlai
Currently Ozone relies on {{HADOOP_\*}} environment variables (eg.
{{HADOOP_HOME}}) for historical and practical reasons (code reuse). This can
lead t unexpected results if Hadoop and Ozone are both present on a node and
they share their environment. Eg. we had to implement a workaround for finding
{{ozone-config.sh}} relative to the script being executed when {{HADOOP_HOME}}
points to Hadoop, not Ozone (HDDS-1912 and HDDS-4450).
Another similar severe problem happens if we would like to access Ozone
filesystem both via {{ozone}} and {{hadoop}} commands. The latter needs shaded
Ozone FS JAR in {{HADOOP_CLASSPATH}}. The same {{HADOOP_CLASSPATH}} results in
{{ClassNotFound}} for {{ozone}}.
The solution proposed in HDDS-1912:
bq. Long-term we may need to replace all the HADOOP_ environment variable with
an OZONE_ environment variable, but that would be a significant bigger change.
This would allow using different classpaths, logging parameters, and more.
To be backward compatible, we should use existing {{HADOOP_}} variables as
fallback for the corresponding {{OZONE_}} ones, but let {{OZONE_X}} take
precedence over {{HADOOP_X}} if the former is defined.
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