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https://issues.apache.org/jira/browse/HDFS-11268?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15823810#comment-15823810
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SammiChen commented on HDFS-11268:
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Hi [~jojochuang]], you're right, EC policy ID is stored using replication
factor field. After I did more investigation, It turns out that the problem is
the EC policy ID loading process from the FsImage file. I updated the JIRA
description accordingly.
> Correctly reconstruct erasure coding file from FSImage
> ------------------------------------------------------
>
> Key: HDFS-11268
> URL: https://issues.apache.org/jira/browse/HDFS-11268
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: erasure-coding
> Affects Versions: 3.0.0-alpha1
> Reporter: SammiChen
> Assignee: SammiChen
> Priority: Critical
> Labels: hdfs-ec-3.0-must-do
> Attachments: HDFS-11268-001.patch
>
>
> Currently, FSImageFormatProtoBuf has the information about whether the file
> is striped or not and saved file's erasure coding policy ID in replication
> field. But later, when FSImage is loaded to create the name space, the
> default system erasure coding policy is used to reconstruct file's block
> structure. In case if the erasure coding policy of file is not the default
> erasure coding policy, the content of the file cannot be accessed correctly.
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