[jira] [Created] (HDFS-12812) Ozone: dozone: initialize scm directory on cluster startup

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

Elek, Marton created HDFS-12812:
-----------------------------------

             Summary: Ozone: dozone: initialize scm directory on cluster startup
                 Key: HDFS-12812
                 URL: https://issues.apache.org/jira/browse/HDFS-12812
             Project: Hadoop HDFS
          Issue Type: Sub-task
          Components: ozone
    Affects Versions: HDFS-7240
            Reporter: Elek, Marton


HDFS-12739 fixed the scm, but after the patch it couldn't be started without a separated `hdfs scm -init` any more. Unfortunatelly it breaks the docker-compose functionality.

This is handled int the starter script of the base runner docker image for namenode. I also fixed this in the runner docker image (https://github.com/elek/hadoop/commit/b347eb4bfca37d84dbcdd8c4bf353219d876a9b7) will upload the improved patch to the HADOOP-14898.

In this patch I just add a new environment variable to init the scm if the version file doesn't exist.

To test:

Do a full build and go to the dev-support/compose/ozone:

```
docker-compose pull
docker-compose up -d
```

Note: the pull is important as the new docker image -- which could handle the new environment variable -- should be used



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