[jira] [Created] (HDDS-5441) Disallow same set of DNs to be part of multiple pipelines

["Shashikant Banerjee (Jira)" <ji...@apache.org>]

Shashikant Banerjee created HDDS-5441:
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             Summary: Disallow same set of DNs to be part of multiple pipelines
                 Key: HDDS-5441
                 URL: https://issues.apache.org/jira/browse/HDDS-5441
             Project: Apache Ozone
          Issue Type: Bug
          Components: SCM
            Reporter: Shashikant Banerjee
            Assignee: Shashikant Banerjee
             Fix For: 1.2.0


Currently, with multi raft feature ON, a data node can participate in multiple pipelines. But, same set of dns can be part of multiple pipelines . This leads to 2 problems:

1) In case of let's say 5 datanodes, as and when 3 datanodes register initially with multi-raft feature ON, those 3 datanodes will pair among themselves to create two pipelines thereby satisfying the default pipeline limit of 2 per dn. Next datanodes even after registering cannot take part in writes bcoz it needs a 6th datanode to come up to form the nest tri-set , thereby remain unutilized.

2) With same set of Datanodes being part of multiple plpelines, if one datanode fails, the source for container re-replication will be only the other set of 2 nodes and can beocme a bottleneck.

3) This uneven distribution of pipelines among dns will lead to load distribution getting uneven as well.

 

 



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