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From "SammiChen (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-7337) Configurable and pluggable Erasure Codec and schema
Date Tue, 11 Apr 2017 10:55:42 GMT

    [ https://issues.apache.org/jira/browse/HDFS-7337?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15964172#comment-15964172
] 

SammiChen commented on HDFS-7337:
---------------------------------

For remove policy, one suggestion is the lazy remove. That is, when user uses the CLI command
to remove a policy A, policy A will only be marked as removed in NN and will not be available
to apply to new dir/file any more. But until next time NN restart, if there is no dir/file
using this policy, then policy A can be deleted permanently from the system. With this approach,
we leverage the NN restart process, go through the entire namespace to find out whether there
is file of this specific policy. 

> Configurable and pluggable Erasure Codec and schema
> ---------------------------------------------------
>
>                 Key: HDFS-7337
>                 URL: https://issues.apache.org/jira/browse/HDFS-7337
>             Project: Hadoop HDFS
>          Issue Type: New Feature
>          Components: erasure-coding
>            Reporter: Zhe Zhang
>            Priority: Critical
>              Labels: hdfs-ec-3.0-nice-to-have
>         Attachments: HDFS-7337-prototype-v1.patch, HDFS-7337-prototype-v2.zip, HDFS-7337-prototype-v3.zip,
PluggableErasureCodec.pdf, PluggableErasureCodec-v2.pdf, PluggableErasureCodec-v3.pdf
>
>
> According to HDFS-7285 and the design, this considers to support multiple Erasure Codecs
via pluggable approach. It allows to define and configure multiple codec schemas with different
coding algorithms and parameters. The resultant codec schemas can be utilized and specified
via command tool for different file folders. While design and implement such pluggable framework,
it’s also to implement a concrete codec by default (Reed Solomon) to prove the framework
is useful and workable. Separate JIRA could be opened for the RS codec implementation.
> Note HDFS-7353 will focus on the very low level codec API and implementation to make
concrete vendor libraries transparent to the upper layer. This JIRA focuses on high level
stuffs that interact with configuration, schema and etc.



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