Yongjun Zhang created HDFS-12357:
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Summary: Let NameNode to bypass external attribute provider for
special user
Key: HDFS-12357
URL: https://issues.apache.org/jira/browse/HDFS-12357
Project: Hadoop HDFS
Issue Type: Bug
Reporter: Yongjun Zhang
This is a third proposal to solve the problem described in HDFS-12202.
The problem is, when we do distcp from one cluster to another (or within the
same cluster), in addition to copying file data, we copy the metadata from
source to target. If external attribute provider is enabled, the metadata may
be read from the provider, thus provider data read from source may be saved to
target HDFS.
We want to avoid saving metadata from external provider to HDFS, so we want to
bypass external provider when doing the distcp (or hadoop fs -cp) operation.
Two alternative approaches were proposed earlier, one in HDFS-12202, the other
in HDFS-12294. The proposal here is the third one.
The idea is, we introduce a new config, that specifies a special user (or a
list of users), and let NN bypass external provider when the current user is a
special user.
If we run applications as the special user that need data from external
attribute provider, then it won't work. So the constraint on this approach is,
the special users here should not run applications that need data from external
provider.
Thanks [~asuresh] for proposing this idea and [~chris.douglas], [~daryn],
[~manojg] for the discussions in the other jiras.
I'm creating this one to discuss further.
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