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Posted to common-issues@hadoop.apache.org by "Wei-Chiu Chuang (JIRA)" <ji...@apache.org> on 2016/12/21 23:16:58 UTC
[jira] [Comment Edited] (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=15768448#comment-15768448 ]
Wei-Chiu Chuang edited comment on HADOOP-13665 at 12/21/16 11:16 PM:
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[~kaisasak] thanks for the patch!
The patch looks good overall. I would like to ask you to add a few log messages for better supportability.
* Please log a debug message for the codec that is eventually loaded.
* Inside {{catch (RuntimeException e) }} block, please add either a WARN log that prints the cause of the exception.
These messages can greatly help diagnosing performance issues.
was (Author: jojochuang):
[~kaisasak] thanks for the patch!
The patch looks good overall. I would like to ask you to add a few log message for better supportability.
* Please log a debug message for the codec that is eventually loaded.
* Inside {{catch (RuntimeException e) }} block, please add either a WARN log that prints the cause of the exception.
These messages can greatly help diagnosing performance issues.
> 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
> Labels: hdfs-ec-3.0-must-do
> Attachments: HADOOP-13665.01.patch, HADOOP-13665.02.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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