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From "Lei (Eddy) Xu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-6727) Refresh data volumes on DataNode based on configuration changes
Date Mon, 19 Jan 2015 08:55:35 GMT

    [ https://issues.apache.org/jira/browse/HDFS-6727?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14282277#comment-14282277
] 

Lei (Eddy) Xu commented on HDFS-6727:
-------------------------------------

Great question, [~jiangyu1211].

Our original design was relying on DataNode's own timeout to do the blockreport, mostly for
the simplicity reason. You can use {{hdfs dfsadmin -triggerBlockReport}} to trigger block
report if necessary. If there is a strong desire to always send blockreport after swapping
a drive, I'd add it in a followup JIRA. 

bq. obvious you have data in it.

We were actually thinking about removing bad disks and adding larger empty disks as major
cases. As mentioned above, if adding a loaded disk is a very common task, I'd love to file
another JIRA to let DN send block report right after how swap job finishes. 

> Refresh data volumes on DataNode based on configuration changes
> ---------------------------------------------------------------
>
>                 Key: HDFS-6727
>                 URL: https://issues.apache.org/jira/browse/HDFS-6727
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: datanode
>    Affects Versions: 2.5.0, 2.4.1
>            Reporter: Lei (Eddy) Xu
>            Assignee: Lei (Eddy) Xu
>              Labels: datanode
>             Fix For: 2.6.0
>
>         Attachments: HDFS-6727.000.delta-HDFS-6775.txt, HDFS-6727.001.patch, HDFS-6727.002.patch,
HDFS-6727.003.patch, HDFS-6727.004.patch, HDFS-6727.005.patch, HDFS-6727.006.patch, HDFS-6727.006.patch,
HDFS-6727.007.patch, HDFS-6727.008.patch, HDFS-6727.combo.patch, patchFindBugsOutputhadoop-hdfs.txt
>
>
> HDFS-1362 requires DataNode to reload configuration file during the runtime, so that
DN can change the data volumes dynamically. This JIRA reuses the reconfiguration framework
introduced by HADOOP-7001 to enable DN to reconfigure at runtime.



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