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https://issues.apache.org/jira/browse/HDFS-11072?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15722051#comment-15722051
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Rakesh R edited comment on HDFS-11072 at 12/5/16 1:40 PM:
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Thanks [~Sammi] for the patch. I'm adding few thoughts, please take a look at
it.
# Since this is not a regular ec policy which doesn't needs codec support, I'd
prefer to use a value -1 or -128?. That way, in future, for the new EC policies
can represent continuous numbers 4, 5 etc.
{code}public static final byte CONTINUOUS_REPLICATE_POLICY_ID = 4;{code}
# What you think about exposing a new convenient API
{{unsetErasureCodingPolicy(dir)}} and {{-unsetPolicy <path>}} command? Also,
just a thought to make {{CONTINUOUS_REPLICATE_SCHEMA}} policy internal if the
semantic of this is only for unset(going back to traditional block replication).
# In docs, could you please mention that one can change ec policy on a
directory.
was (Author: rakeshr):
Thanks [~Sammi] for the patch. I'm adding few thoughts, please take a look at
it.
# Since this is not a regular ec policy which needs codec support, I'd prefer
to use a value -1 or -128?. That way, in future, for the new EC policies can
represent continuous numbers 4, 5 etc.
{code}public static final byte CONTINUOUS_REPLICATE_POLICY_ID = 4;{code}
# What you think about exposing a new convenient API
{{unsetErasureCodingPolicy(dir)}} and {{-unsetPolicy <path>}} command? Also,
just a thought to make {{CONTINUOUS_REPLICATE_SCHEMA}} policy internal if the
semantic of this is only for unset(going back to traditional block replication).
# In docs, could you please mention that one can change ec policy on a
directory.
> Add ability to unset and change directory EC policy
> ---------------------------------------------------
>
> Key: HDFS-11072
> URL: https://issues.apache.org/jira/browse/HDFS-11072
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: erasure-coding
> Affects Versions: 3.0.0-alpha1
> Reporter: Andrew Wang
> Assignee: SammiChen
> Labels: hdfs-ec-3.0-must-do
> Attachments: HDFS-11072-v1.patch, HDFS-11072-v2.patch,
> HDFS-11072-v3.patch, HDFS-11072-v4.patch
>
>
> Since the directory-level EC policy simply applies to files at create time,
> it makes sense to make it more similar to storage policies and allow changing
> and unsetting the policy.
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