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Posted to common-issues@hadoop.apache.org by "Kai Sasaki (JIRA)" <ji...@apache.org> on 2017/04/02 14:14:41 UTC
[jira] [Commented] (HADOOP-13665) Erasure Coding codec should
support fallback coder
[ https://issues.apache.org/jira/browse/HADOOP-13665?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15952697#comment-15952697 ]
Kai Sasaki commented on HADOOP-13665:
-------------------------------------
Thanks [~drankye] for comments.
{quote}
For example, if the codec name is xcodec, then the property key to be used to get the raw coders can be: "io.erasurecode.codec." + xcodec + ".rawcoders";
{quote}
The default value of each config cannot be decided by given codec directly. So I set the default value into {{DEFAULT_CODERS_MAP}}.
> 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
>
>
> 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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