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https://issues.apache.org/jira/browse/HDFS-5784?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13874190#comment-13874190
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Andrew Wang commented on HDFS-5784:
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LGTM, +1
> reserve space in edit log header and fsimage header for feature flag section
> ----------------------------------------------------------------------------
>
> Key: HDFS-5784
> URL: https://issues.apache.org/jira/browse/HDFS-5784
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: namenode
> Affects Versions: 2.4.0
> Reporter: Colin Patrick McCabe
> Assignee: Colin Patrick McCabe
> Attachments: HDFS-5784.001.patch, HDFS-5784.002.patch,
> HDFS-5784.003.patch
>
>
> We should reserve space in the edit log header and fsimage header so that we
> can add layout feature flags later in a compatible manner.
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