Elek, Marton created HDDS-907:
---------------------------------

             Summary: Use WAITFOR environment variable to handle dependencies 
between ozone containers
                 Key: HDDS-907
                 URL: https://issues.apache.org/jira/browse/HDDS-907
             Project: Hadoop Distributed Data Store
          Issue Type: Improvement
          Components: docker
            Reporter: Elek, Marton


Until HDDS-839 we had a hard-coded 15 seconds sleep before we started 
ozoneManager with the docker-compose files 
(hadoop-ozone/dist/target/ozone-0.4.0-SNAPSHOT/compose).

For initialization of the OzoneManager we need the scm. Om will retry the 
connection if scm is not available but the dns resolution is cached: if the dns 
of scm is not available at the startup of om, it can't be initialized.

Before HDDS-839 we handled this dependency with the 15 seconds sleep, which was 
usually slower what we need.

Now we can use the WAITFOR environment variables from HDDS-839 to handle this 
dependency (like WAITFOR:scmL9876) which can be added to all the docker-compose 
files.


 



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