Yongjun Zhang created HDFS-12294:
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Summary: Support /.reserved/bypassExtAttr prefix to file path so
getFileStatus etc can bypass external attribute provider
Key: HDFS-12294
URL: https://issues.apache.org/jira/browse/HDFS-12294
Project: Hadoop HDFS
Issue Type: Improvement
Components: hdfs
Reporter: Yongjun Zhang
Assignee: Yongjun Zhang
This is an alternative solution for HDFS-12202, which proposed introducing a
new set of API, with an additional boolean parameter bypassExtAttrProvider, so
to let NN bypass external attribute provider when getFileStatus. The goal is to
avoid distcp from copying attributes from one cluster's external attribute
provider and save to another cluster's fsimage.
The solution here is, instead of having an additional parameter, encode this
parameter to the path itself, when calling getFileStatus (and some other
calls), NN will parse the path, and figure out that whether external attribute
provider need to be bypassed.
Thanks much to [~andrew.wang] for this suggestion. The scope of change is
smaller and we don't have to change the FileSystem APIs.
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