GlenGeng edited a comment on pull request #2090:
URL: https://github.com/apache/ozone/pull/2090#issuecomment-811774644
> @GlenGeng , can you explain why OzoneContainer#start() needs to be called
multiple times if SCM HA is enabled for registering to the same SCM?
Please check
```
public class SCMConnectionManager
implements Closeable, SCMConnectionManagerMXBean {
private static final Logger LOG =
LoggerFactory.getLogger(SCMConnectionManager.class);
private final ReadWriteLock mapLock;
private final Map<InetSocketAddress, EndpointStateMachine> scmMachines;
```
The SCM Connection will go through `VersionEndpointTask`,
`RegisterEndpointTask` and `HeartbeatEndpointTask`.
Previously, the `VersionEndpointTask#call()` will execute
```
// Start the container services after getting the version
information
ozoneContainer.start(clusterId);
```
If SCM HA is enabled, there will be 3 VersionEndpointTask created, one for
each SCM.
DN will call `VersionEndpointTask#call` for each of them. Yet, we need
ensure that `OzoneContainer` should only be started once.
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