[jira] [Updated] (AMBARI-10645) Adjust block replication for clusters with less than 3 DataNodes

["sam liu (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/AMBARI-10645?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

sam liu updated AMBARI-10645:
-----------------------------
    Attachment: AMBARI-10645-001.patch

With this patch, the installation GUI could set correct value to property 'Block replication' in the 'Customize Services' page. For example:
- If I select two datanodes in 'Assign Slaves and Clients' page, the value of property 'Block replication' in the 'Customize Services' page is 2
- If I select one datanode in 'Assign Slaves and Clients' page, the value of property 'Block replication' in the 'Customize Services' page is 1

> Adjust block replication for clusters with less than 3 DataNodes
> ----------------------------------------------------------------
>
>                 Key: AMBARI-10645
>                 URL: https://issues.apache.org/jira/browse/AMBARI-10645
>             Project: Ambari
>          Issue Type: Improvement
>          Components: ambari-server
>    Affects Versions: 2.2.0
>            Reporter: sam liu
>         Attachments: AMBARI-10645-001.patch
>
>
> When we install on a cluster with less than 3 DataNodes, the replication factor is set to 3 anyway. It does not make sense. We should change this value to a lower number  to avoid missing replicas(for example, if there is just one DN, set the replication factor to 1).



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