Jing Zhao created HDFS-5714:
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Summary: Use byte array to represent UnderConstruction feature and
Snapshot feature for INodeFile
Key: HDFS-5714
URL: https://issues.apache.org/jira/browse/HDFS-5714
Project: Hadoop HDFS
Issue Type: Sub-task
Reporter: Jing Zhao
Assignee: Jing Zhao
Currently we define specific classes to represent different INode features,
such as FileUnderConstructionFeature and FileWithSnapshotFeature. While
recording these feature information in memory, the internal information and
object references can still cost a lot of memory. For example, for
FileWithSnapshotFeature, not considering the INode's local name, the whole
FileDiff list (with size n) can cost around 120n bytes.
In order to decrease the memory usage, we plan to use byte array to record the
UnderConstruction feature and Snapshot feature for INodeFile. Specifically, if
we use protobuf's encoding, the memory usage for a FileWithSnapshotFeature can
be less than 56n bytes.
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