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https://issues.apache.org/jira/browse/HDFS-6382?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14033079#comment-14033079
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Steve Loughran commented on HDFS-6382:
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{quote}
It's sort of ridiculous to require YARN running for what is fundamentally a
file system problem. It simply doesn't work in the real world.
{quote}
Allen, that's like saying "it's ridiculous to require bash scripts to perform
what is fundamentally a unix filesystem problem". One is data, the other is the
mechanism to run code near the data. I don't try and hide any local /tmp
cleanup init.d scripts inside an ext3 plugin, after all.
YARN
# handles security by having you include kerberos tickets in the launch.
# stops you having to choose a specific server to run this thing (hence point
of failure).
# lets you scale up when needed.
> HDFS File/Directory TTL
> -----------------------
>
> Key: HDFS-6382
> URL: https://issues.apache.org/jira/browse/HDFS-6382
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: hdfs-client, namenode
> Affects Versions: 2.4.0
> Reporter: Zesheng Wu
> Assignee: Zesheng Wu
> Attachments: HDFS-TTL-Design -2.pdf, HDFS-TTL-Design.pdf
>
>
> In production environment, we always have scenario like this, we want to
> backup files on hdfs for some time and then hope to delete these files
> automatically. For example, we keep only 1 day's logs on local disk due to
> limited disk space, but we need to keep about 1 month's logs in order to
> debug program bugs, so we keep all the logs on hdfs and delete logs which are
> older than 1 month. This is a typical scenario of HDFS TTL. So here we
> propose that hdfs can support TTL.
> Following are some details of this proposal:
> 1. HDFS can support TTL on a specified file or directory
> 2. If a TTL is set on a file, the file will be deleted automatically after
> the TTL is expired
> 3. If a TTL is set on a directory, the child files and directories will be
> deleted automatically after the TTL is expired
> 4. The child file/directory's TTL configuration should override its parent
> directory's
> 5. A global configuration is needed to configure that whether the deleted
> files/directories should go to the trash or not
> 6. A global configuration is needed to configure that whether a directory
> with TTL should be deleted when it is emptied by TTL mechanism or not.
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