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https://issues.apache.org/jira/browse/HDFS-14771?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16922715#comment-16922715
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He Xiaoqiao commented on HDFS-14771:
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+1 for disable this feature by default, it may be safest and directest approach.
I concern that do we need reconsider to change the layout version since the
compatibility issues is clear. another way, is it necessary to provide tool to
support different format transform? I think it is helpful for
upgrade/downgrade. In my practice, I have to prepare fsimage/editlog tools
before upgrade operation in order to avoid rollback when meet some unexpected
exception, especially for the case which layout versions of fsimage/editlog are
not same or not compatible completely. I believe we could do it use different
OIV tools (parse fsimage binary to xml using new OIV version first, then
transfer the xml to fsimage binary using old OIV version), however it is not
valid always and not convenient actually. Of course, this should be another
topic to discuss. FYI.
> Backport HDFS-14617 to branch-2 (Improve fsimage load time by writing
> sub-sections to the fsimage index)
> --------------------------------------------------------------------------------------------------------
>
> Key: HDFS-14771
> URL: https://issues.apache.org/jira/browse/HDFS-14771
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: namenode
> Affects Versions: 2.10.0
> Reporter: He Xiaoqiao
> Assignee: He Xiaoqiao
> Priority: Major
> Labels: release-blocker
> Attachments: HDFS-14771.branch-2.001.patch,
> HDFS-14771.branch-2.002.patch
>
>
> This JIRA aims to backport HDFS-14617 to branch-2: fsimage load time by
> writing sub-sections to the fsimage index.
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