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From "Tanping Wang (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-1867) Remove a datanode from cluster if include list is not empty and this datanode is removed from both include and exclude lists
Date Mon, 02 May 2011 01:28:03 GMT

     [ https://issues.apache.org/jira/browse/HDFS-1867?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Tanping Wang updated HDFS-1867:
-------------------------------

    Attachment: HDFS-1867.patch

"Hide/not display/forget" an already decommissioned data node who is neither in include nor
exclude hosts lists from the list of live or dead nodes.  This is being found useful for operators
to make the cluster forget a decommissioned data node.  The operation procedure is as following:
  Step I: Host must have been in the include hosts list and the include hosts list must not
be empty.
  Step II: Host is decommissioned by remaining in the include hosts list and added into the
exclude hosts list. Name node is updated with the new information by issuing dfsadmin -refreshNodes
command.
  Step III: Host is removed from both include hosts and exclude hosts lists.  Name node is
updated with the new information by issuing dfsamin -refreshNodes command.

Couple variations to consider: 
# Step II variation ( all the other steps are the same), if a node is added into exclude list,
but removed from include list, the node will appear as dead node.
# Step III variation (all the other steps are the same), if a node remains in
the include list, but removed from exclude list, the node will rejoin as a
live node.

> Remove a datanode from cluster if include list is not empty and this datanode is removed
from both include and exclude lists
> ----------------------------------------------------------------------------------------------------------------------------
>
>                 Key: HDFS-1867
>                 URL: https://issues.apache.org/jira/browse/HDFS-1867
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>            Reporter: Tanping Wang
>            Priority: Minor
>             Fix For: 0.23.0
>
>         Attachments: HDFS-1867.patch
>
>
> This jira is to port HDFS-1773 into trunk.  HDF-1773 was originally fixed on branch-20-security.

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