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From "Yiqun Lin (JIRA)" <j...@apache.org>
Subject [jira] [Assigned] (HDFS-11090) Leave safemode immediately if all blocks have reported in
Date Wed, 02 Nov 2016 12:26:58 GMT

     [ https://issues.apache.org/jira/browse/HDFS-11090?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Yiqun Lin reassigned HDFS-11090:
--------------------------------

    Assignee: Yiqun Lin

> Leave safemode immediately if all blocks have reported in
> ---------------------------------------------------------
>
>                 Key: HDFS-11090
>                 URL: https://issues.apache.org/jira/browse/HDFS-11090
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: namenode
>    Affects Versions: 2.7.3
>            Reporter: Andrew Wang
>            Assignee: Yiqun Lin
>
> Startup safemode is triggered by two thresholds: % blocks reported in, and min # datanodes.
It's extended by an interval (default 30s) until these two thresholds are met.
> Safemode extension is helpful when the cluster has data, and the default % blocks threshold
(0.99) is used. It gives DNs a little extra time to report in and thus avoid unnecessary replication
work.
> However, we can leave startup safemode early if 100% of blocks have reported in.
> Note that operators sometimes change the % blocks threshold to > 1 to never automatically
leave safemode. We should maintain this behavior.



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