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Aaron T. Myers commented on HDFS-4523:
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Why can't we wrap up the discussion here? I'm currently -1 on a design which makes the read-only
snapshots in fact not read-only in the case of concat.
> Fix concat for snapshots
> ------------------------
>
> Key: HDFS-4523
> URL: https://issues.apache.org/jira/browse/HDFS-4523
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: namenode
> Reporter: Tsz Wo (Nicholas), SZE
> Assignee: Tsz Wo (Nicholas), SZE
> Attachments: h4523_20130222.patch, h4523_20130223.patch, h4523_20130225b.patch,
h4523_20130225.patch
>
>
> The use case of concat is for copying large files across clusters using the following
steps.
> - Step 1: The blocks of a file in the source cluster are copied in parallel to transient
files in the destination cluster.
> - Step 2: Then the transient files in the destination cluster are concatenated in order
to obtain the original file.
> If a snapshot is taken in the destination cluster before Step 2, some transient files
may be captured in the snapshot. These transient files should be removed in Step 2.
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