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Posted to dev@ambari.apache.org by sam liu <am...@163.com> on 2015/04/22 03:55:47 UTC

Review Request 33428: Review Request for AMBARI-10645: Adjust block replication for clusters with less than 3 DataNodes

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https://reviews.apache.org/r/33428/
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Review request for Ambari.


Description
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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).


Diffs
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Diff: https://reviews.apache.org/r/33428/diff/


Testing
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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


File Attachments
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AMBARI-10645-001.patch
  https://reviews.apache.org/media/uploaded/files/2015/04/22/4914fe35-3096-4f6c-bca4-2e281a8727a4__AMBARI-10645-001.patch


Thanks,

sam liu