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https://issues.apache.org/jira/browse/HDDS-10326?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17817431#comment-17817431
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Nandakumar commented on HDDS-10326:
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[~arp], as you mentioned the problem is with {{ozone.metadata.dirs}}
configuration which is used by OM, SCM, and the Datanode.
If a separate {{Ratis}} directory is not configured for OM and SCM, they fall
back to {{ozone.metadata.dirs}} location
SCM uses <<{{{}ozone.metadata.dirs{}}}>>/scm-ha
OM uses <<{{{}ozone.metadata.dirs{}}}>>/ratis
Datanode uses <<{{{}ozone.metadata.dirs{}}}>>/ratis
Since OM and Datanode use the same location, configuring OM and Datanode on the
same node will not work unless we specify separate {{ratis}} dir for OM.
We should ideally use <<{{{}ozone.metadata.dirs{}}}>>/scm,
<<{{{}ozone.metadata.dirs{}}}>>/om and <<{{{}ozone.metadata.dirs{}}}>>/datanode
for SCM, OM, and Datanodes respectively, but we cannot make that change now
without breaking upgrades.
+1 on fixing the document.
> Ozone single-node cluster cannot be started by following the docs
> -----------------------------------------------------------------
>
> Key: HDDS-10326
> URL: https://issues.apache.org/jira/browse/HDDS-10326
> Project: Apache Ozone
> Issue Type: Bug
> Components: documentation
> Reporter: Arpit Agarwal
> Assignee: Sarveksha Yeshavantha Raju
> Priority: Major
> Labels: newbie
>
> It is not possible to start an Ozone single-node cluster using the
> instructions on the cwiki here:
> https://cwiki.apache.org/confluence/display/OZONE/Single+Node+Deployment
> Using the {{ozone genconf}} doesn't work either. The only way I could get it
> to work is by specifying separate config dirs for OM, SCM and Datanode that
> have different values for {{ozone.metadata.dirs}}. I didn't investigate in
> depth however the problem seems to be that DataNode uses the same metadata
> dir as the SCM and cannot get the directory lock (thankfully we have that
> safeguard).
> We should at the very least fix the documentation with correct instructions,
> and ideally make it simpler to start a single node cluster by choosing
> sensible defaults.
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