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https://issues.apache.org/jira/browse/HDFS-3107?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14290072#comment-14290072
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Tsz Wo Nicholas Sze commented on HDFS-3107:
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There is a list of unresolved JIRAs. Let's discuss it.
- HDFS-7341 Add initial snapshot support based on pipeline recovery
Is it still relevant?
- HDFS-7058 Tests for truncate CLI
Let's finish it before merging since CLI is user facing. Is anyone working on
it?
- HDFS-7655/HDFS-7656 Expose truncate API for Web HDFS/httpfs
It seems that we should not wait for them before merging. Agree?
- HDFS-7659 We should check the new length of truncate can't be a negative value
Look like that this is going to be committed soon.
- HDFS-7665 Add definition of truncate preconditions/postconditions to
filesystem specification
This is simple a documentation change. Let's finish it before merging?
As a summary, how about finishing HDFS-7058, HDFS-7659 and HDFS-7665 before
merging it to branch-2?
> HDFS truncate
> -------------
>
> Key: HDFS-3107
> URL: https://issues.apache.org/jira/browse/HDFS-3107
> Project: Hadoop HDFS
> Issue Type: New Feature
> Components: datanode, namenode
> Reporter: Lei Chang
> Assignee: Plamen Jeliazkov
> Fix For: 3.0.0
>
> Attachments: HDFS-3107-13.patch, HDFS-3107-14.patch,
> HDFS-3107-15.patch, HDFS-3107-HDFS-7056-combined.patch, HDFS-3107.008.patch,
> HDFS-3107.15_branch2.patch, HDFS-3107.patch, HDFS-3107.patch,
> HDFS-3107.patch, HDFS-3107.patch, HDFS-3107.patch, HDFS-3107.patch,
> HDFS-3107.patch, HDFS-3107.patch, HDFS-3107.patch, HDFS-3107.patch,
> HDFS-3107.patch, HDFS_truncate.pdf, HDFS_truncate.pdf, HDFS_truncate.pdf,
> HDFS_truncate_semantics_Mar15.pdf, HDFS_truncate_semantics_Mar21.pdf,
> editsStored, editsStored.xml
>
> Original Estimate: 1,344h
> Remaining Estimate: 1,344h
>
> Systems with transaction support often need to undo changes made to the
> underlying storage when a transaction is aborted. Currently HDFS does not
> support truncate (a standard Posix operation) which is a reverse operation of
> append, which makes upper layer applications use ugly workarounds (such as
> keeping track of the discarded byte range per file in a separate metadata
> store, and periodically running a vacuum process to rewrite compacted files)
> to overcome this limitation of HDFS.
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