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From "Brahma Reddy Battula (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-11799) Introduce a config to allow setting up write pipeline with fewer nodes than replication factor
Date Tue, 25 Jul 2017 14:41:00 GMT

     [ https://issues.apache.org/jira/browse/HDFS-11799?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Brahma Reddy Battula updated HDFS-11799:
----------------------------------------
    Attachment: HDFS-11799-004.patch

Uploaded patch to address the comments

> Introduce a config to allow setting up write pipeline with fewer nodes than replication
factor
> ----------------------------------------------------------------------------------------------
>
>                 Key: HDFS-11799
>                 URL: https://issues.apache.org/jira/browse/HDFS-11799
>             Project: Hadoop HDFS
>          Issue Type: Bug
>            Reporter: Yongjun Zhang
>            Assignee: Brahma Reddy Battula
>         Attachments: HDFS-11799-002.patch, HDFS-11799-003.patch, HDFS-11799-004.patch,
HDFS-11799.patch
>
>
> During pipeline recovery, if not enough DNs can be found, if 
> dfs.client.block.write.replace-datanode-on-failure.best-effort
> is enabled, we let the pipeline to continue, even if there is a single DN.
> Similarly, when we create the write pipeline initially, if for some reason we can't find
enough DNs, we can have a similar config to enable writing with a single DN.
> More study will be done.
>  



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