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https://issues.apache.org/jira/browse/HDFS-14858?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16936863#comment-16936863
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Jim Brennan commented on HDFS-14858:
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[~vagarychen], [~jojochuang] As a major new feature for branch-2, I think this
should default to false (DFS_NAMENODE_STATE_CONTEXT_ENABLED_DEFAULT = false).
> [SBN read] Allow configurably enable/disable AlignmentContext on NameNode
> -------------------------------------------------------------------------
>
> Key: HDFS-14858
> URL: https://issues.apache.org/jira/browse/HDFS-14858
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: hdfs
> Reporter: Chen Liang
> Assignee: Chen Liang
> Priority: Major
> Attachments: HDFS-14858.001.patch, HDFS-14858.002.patch
>
>
> As brought up under HDFS-14277, we should make sure SBN read has no
> performance impact when it is not enabled. One potential overhead of SBN read
> is maintaining and updating additional state status on NameNode.
> Specifically, this is done by creating/updating/checking a
> {{GlobalStateIdContext}} instance. Currently, even without enabling SBN read,
> this logic is still be checked. We can make this configurable so that when
> SBN read is not enabled, there is no such overhead and everything works as-is.
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