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From "Mingliang Liu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-9498) Move code that tracks orphan blocks to BlockManagerSafeMode
Date Sat, 19 Dec 2015 00:40:47 GMT

    [ https://issues.apache.org/jira/browse/HDFS-9498?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15065068#comment-15065068
] 

Mingliang Liu commented on HDFS-9498:
-------------------------------------

Thanks [~anu] for your comment.

Yes we should check the orphan blocks only in start up safe mode.

# The {{BMSafeModeStatus}}, which tracks the start up safe mode only, has three possible values
which are _PENDING_THRESHOLDING_, _EXTENSION_ and _OFF_ respectively. If the NN enters safe
mode manually or because of low resource, the {{FSNamesystem}} will call {{setManualAndResourceLowSafeMode}}
while the {{BlockManagerSafeMode}} stays OFF.
# One corner case is when the NN is in start up safe mode, the operator enters safe mode manully.
The {{BlockManagerSafeMode}} is still in PENDING_THRESHOLD status. This case we keep tracking
the orphan blocks. This is different from original semantic. 
If this does not make sense, we can change it. Is this the case you're concerned?

> Move code that tracks orphan blocks to BlockManagerSafeMode
> -----------------------------------------------------------
>
>                 Key: HDFS-9498
>                 URL: https://issues.apache.org/jira/browse/HDFS-9498
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: namenode
>            Reporter: Mingliang Liu
>            Assignee: Mingliang Liu
>         Attachments: HDFS-9498.000.patch, HDFS-9498.001.patch, HDFS-9498.002.patch, HDFS-9498.003.patch
>
>
> [HDFS-4015] counts and reports orphaned blocks  {{numberOfBytesInFutureBlocks}} in safe
mode. It was implemented in {{BlockManager}}. Per discussion in [HDFS-9129] which introduces
the {{BlockManagerSafeMode}}, we can move code that maintaining orphaned blocks to this class.



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