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https://issues.apache.org/jira/browse/HADOOP-13665?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15958477#comment-15958477
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Kai Zheng commented on HADOOP-13665:
------------------------------------
Thanks [~lewuathe] for the update and [~jojochuang] for the comments! It looks
close now. I like the idea of {{createRawEncoderWithFallback}} a lot.
bq. would it make sense to update IO_ERASURECODE_CODEC_RS_RAWCODERS_DEFAULT to
be org....NativeRSRawErasureCoderFactory,org.....RSRawErasureCoderFactory?
Yes, we should configure like this, instead of the way as below:
{code}
+ public static final String IO_ERASURECODE_CODEC_RS_RAWCODERS_DEFAULT =
+ "rs,rs-legacy";
{code}
[~lewuathe], for your understanding, *rs* and *rs-legacy* are different codecs
so we'd better not mix them.
> Erasure Coding codec should support fallback coder
> --------------------------------------------------
>
> Key: HADOOP-13665
> URL: https://issues.apache.org/jira/browse/HADOOP-13665
> Project: Hadoop Common
> Issue Type: Sub-task
> Components: io
> Reporter: Wei-Chiu Chuang
> Assignee: Kai Sasaki
> Priority: Blocker
> Labels: hdfs-ec-3.0-must-do
> Attachments: HADOOP-13665.01.patch, HADOOP-13665.02.patch,
> HADOOP-13665.03.patch, HADOOP-13665.04.patch, HADOOP-13665.05.patch,
> HADOOP-13665.06.patch, HADOOP-13665.07.patch, HADOOP-13665.08.patch,
> HADOOP-13665.09.patch
>
>
> The current EC codec supports a single coder only (by default pure Java
> implementation). If the native coder is specified but is unavailable, it
> should fallback to pure Java implementation.
> One possible solution is to follow the convention of existing Hadoop native
> codec, such as transport encryption (see {{CryptoCodec.java}}). It supports
> fallback by specifying two or multiple coders as the value of property, and
> loads coders in order.
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