Tsz Wo (Nicholas), SZE created HDFS-4103:
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Summary: Support O(1) snapshot creation
Key: HDFS-4103
URL: https://issues.apache.org/jira/browse/HDFS-4103
Project: Hadoop HDFS
Issue Type: Sub-task
Components: name-node
Reporter: Tsz Wo (Nicholas), SZE
In our first snapshot implementation, snapshot creation runs in O(N) and
occupies O(N) memory space, where N = # files + # directories + # symlinks in
the snapshot. The advantages of the implementation are that there is no
additional cost for the modifications after snapshots are created, and it leads
to a simple implementation.
In this JIRA, we optimize snapshot creation to O(1) although it introduces
additional cost in the modifications after snapshots are created.
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