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https://issues.apache.org/jira/browse/HDFS-1637?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12998585#comment-12998585
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Jitendra Nath Pandey commented on HDFS-1637:
--------------------------------------------
In this patch, the initFsDataSet is called when setupBP (which performs
handshake with namenode) has succeeded for a namenode. Although, initFsDataSet
will be called multiple times (once after handshake with each namenode), but
FSDataset is initialized only once.
> Federation: FSDataset in Datanode should be created after initial handshake
> with namenode
> -----------------------------------------------------------------------------------------
>
> Key: HDFS-1637
> URL: https://issues.apache.org/jira/browse/HDFS-1637
> Project: Hadoop HDFS
> Issue Type: Bug
> Affects Versions: Federation Branch
> Reporter: Jitendra Nath Pandey
> Assignee: Jitendra Nath Pandey
> Fix For: Federation Branch
>
> Attachments: HDFS-1637.1.patch
>
>
> Currently storage is initialized only after handshake with a namenode.However
> FSDataset is created before handshake and hence before storage
> initialization. At this time, storage does not have storage directories
> resulting in FSDataset initialized with no volumes.
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