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https://issues.apache.org/jira/browse/HDFS-7877?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15862549#comment-15862549
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Ming Ma edited comment on HDFS-7877 at 2/11/17 10:23 PM:
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Thanks [~manojg] and [~dilaver] for the good point. What you suggested makes
sense. The reason we don't have this requirement so far is probably because
when we put nodes into maintenance, we often do it one upgrade domain at a
time, thus no two replicas will be put to maintenance at the same time.
To confirm, given we still allow applications to create blocks with smaller
replication factor than {{dfs.namenode.maintenance.replication.min}}, the
transition policy from {{ENTERING_MAINTENANCE}} to {{IN_MAINTENANCE}} will
become the # of live replicas >=
min({{dfs.namenode.maintenance.replication.min}}, replication factor).
was (Author: mingma):
Thanks [~manojg]. Good point. What you suggested makes sense. The reason we
don't have this requirement in our production is probably because we only put
nodes in one upgrade domain into maintenance at a time; after one batch is
done, move to the next upgrade domain. Thus no two replicas will be put to
maintenance at the same time.
To confirm, given we will still allow applications to create blocks with
smaller replication factor than {{dfs.namenode.maintenance.replication.min}},
the transition policy from {{ENTERING_MAINTENANCE}} to {{IN_MAINTENANCE}}
becomes the # of live replicas >=
min({{dfs.namenode.maintenance.replication.min}}, replication factor).
> Support maintenance state for datanodes
> ---------------------------------------
>
> Key: HDFS-7877
> URL: https://issues.apache.org/jira/browse/HDFS-7877
> Project: Hadoop HDFS
> Issue Type: New Feature
> Components: datanode, namenode
> Reporter: Ming Ma
> Assignee: Ming Ma
> Attachments: HDFS-7877-2.patch, HDFS-7877.patch,
> Supportmaintenancestatefordatanodes-2.pdf,
> Supportmaintenancestatefordatanodes.pdf
>
>
> This requirement came up during the design for HDFS-7541. Given this feature
> is mostly independent of upgrade domain feature, it is better to track it
> under a separate jira. The design and draft patch will be available soon.
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