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From "Nicolas Fraison (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-13295) Namenode doesn't leave safemode if dfs.namenode.safemode.replication.min set < dfs.namenode.replication.min
Date Thu, 15 Mar 2018 16:32:00 GMT

     [ https://issues.apache.org/jira/browse/HDFS-13295?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Nicolas Fraison updated HDFS-13295:
-----------------------------------
    Attachment: HDFS-13295.patch

> Namenode doesn't leave safemode if dfs.namenode.safemode.replication.min set < dfs.namenode.replication.min
> -----------------------------------------------------------------------------------------------------------
>
>                 Key: HDFS-13295
>                 URL: https://issues.apache.org/jira/browse/HDFS-13295
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: namenode
>         Environment: CDH 5.11 with HDFS-8716 backported.
> dfs.namenode.replication.min=2
> dfs.namenode.safemode.replication.min=1
>  
>            Reporter: Nicolas Fraison
>            Priority: Major
>         Attachments: HDFS-13295.patch
>
>
> When we set dfs.namenode.safemode.replication.min < dfs.namenode.replication.min from
HDFS-8716 patch the number of replica for which it will increase the safe block count
> must be equal to dfs.namenode.safemode.replication.min in `FSNamesystem.incrementSafeBlockCount`
> When reading modification from edits, the replica number for new blocks is set at min(numNodes,
> dfs.namenode.replication.min) in BlockManager.completeBlock which is greater than dfs.namenode.safemode.replication.min.
> Due to that safe block count never reach number of available blocks and namenode doesn't
leave automatically the safemode



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