Haohui Mai created HDFS-8248:
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Summary: Store INodeId instead of the INodeFile object in
BlockInfoContiguous
Key: HDFS-8248
URL: https://issues.apache.org/jira/browse/HDFS-8248
Project: Hadoop HDFS
Issue Type: Improvement
Reporter: Haohui Mai
Assignee: Haohui Mai
Attachments: HDFS-8248.000.patch
Currently the namespace and the block manager are tightly coupled together.
There are two couplings in terms of implementation:
1. The {{BlockInfoContiguous}} stores a reference of the {{INodeFile}} that
owns the block, so that the block manager can look up the corresponding file
when replicating blocks, recovering from pipeline failures, etc.
1. The {{INodeFile}} stores {{BlockInfoContiguous}} objects that the file owns.
Decoupling the namespace and the block manager allows the BM to be separated
out from the Java heap or even as a standalone process. This jira proposes to
remove the first coupling by storing the id of the inode instead of the object
reference of {{INodeFile}} in the {{BlockInfoContiguous}} class.
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