dragon created HDFS-10149:
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Summary: CLONE - Erasure coding: store EC schema and cell size in
INodeFile and eliminate notion of EC zones
Key: HDFS-10149
URL: https://issues.apache.org/jira/browse/HDFS-10149
Project: Hadoop HDFS
Issue Type: Sub-task
Components: namenode
Affects Versions: HDFS-7285
Reporter: dragon
Assignee: Zhe Zhang
Fix For: HDFS-7285
We have [discussed |
https://issues.apache.org/jira/browse/HDFS-7285?focusedCommentId=14357754&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-14357754]
storing EC schema with files instead of EC zones and recently revisited the
discussion under HDFS-8059.
As a recap, the _zone_ concept has severe limitations including renaming and
nested configuration. Those limitations are valid in encryption for security
reasons and it doesn't make sense to carry them over in EC.
This JIRA aims to store EC schema and cell size on {{INodeFile}} level. For
simplicity, we should first implement it as an xattr and consider memory
optimizations (such as moving it to file header) as a follow-on. We should also
disable changing EC policy on a non-empty file / dir in the first phase.
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