Chen Liang created HDFS-14858:
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Summary: [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
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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