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https://issues.apache.org/jira/browse/HDFS-7056?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14171525#comment-14171525
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Konstantin Shvachko commented on HDFS-7056:
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The proposal is to only copy block list when file is truncated. This allowes to
avoid changes for append.
If the file is truncated and then appended the subsequent snapshots will not
need to have a copy of the block list. They will reference the original list of
the file, until the file is truncated again.
> Snapshot support for truncate
> -----------------------------
>
> Key: HDFS-7056
> URL: https://issues.apache.org/jira/browse/HDFS-7056
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: namenode
> Affects Versions: 3.0.0
> Reporter: Konstantin Shvachko
>
> Implementation of truncate in HDFS-3107 does not allow truncating files which
> are in a snapshot. It is desirable to be able to truncate and still keep the
> old file state of the file in the snapshot.
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