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Posted to common-issues@hadoop.apache.org by "Arpit Agarwal (JIRA)" <ji...@apache.org> on 2018/05/02 23:12:00 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=16461719#comment-16461719 ]
Arpit Agarwal commented on HADOOP-13665:
----------------------------------------
Hi [~lewuathe], [~jojochuang] - do you know the runtime behavior when ISA-L library is present but the processor lacks instruction set support? Will we correctly fall back to the Java implementation?
> 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
> Fix For: 3.0.0-alpha4
>
> 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, HADOOP-13665.10.patch, HADOOP-13665.11.patch, HADOOP-13665.12.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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