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From "Tsz Wo Nicholas Sze (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-3107) HDFS truncate
Date Mon, 19 Jan 2015 20:51:36 GMT

    [ https://issues.apache.org/jira/browse/HDFS-3107?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14282983#comment-14282983
] 

Tsz Wo Nicholas Sze commented on HDFS-3107:
-------------------------------------------

BTW, the truncate unit test is failing occasionally; see [build #9264|https://builds.apache.org/job/PreCommit-HDFS-Build/9264//testReport/],
[build #9257|https://builds.apache.org/job/PreCommit-HDFS-Build/9257//testReport/], [build
#9255|https://builds.apache.org/job/PreCommit-HDFS-Build/9255//testReport/] and [build #9244|https://builds.apache.org/job/PreCommit-HDFS-Build/9244/testReport/].

> 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.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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