Uma Maheswara Rao G created HADOOP-17028:
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Summary: ViewFS should initialize target filesystems lazily
Key: HADOOP-17028
URL: https://issues.apache.org/jira/browse/HADOOP-17028
Project: Hadoop Common
Issue Type: Bug
Components: client-mounts, fs, viewfs
Affects Versions: 3.2.1
Reporter: Uma Maheswara Rao G
Currently viewFS initialize all configured target filesystems when viewfs#init
itself.
Some target file system initialization involve creating heavy objects and proxy
connections. Ex: DistributedFileSystem#initialize will create DFSClient object
which will create proxy connections to NN etc.
For example: if ViewFS configured with 10 target fs with hdfs uri and 2 targets
with s3a.
If one of the client only work with s3a target, But ViewFS will initialize all
targets irrespective of what clients interested to work with. That means, here
client will create 10 DFS initializations and 2 s3a initializations. Its
unnecessary to have DFS initialization here. So, it will be a good idea to
initialize the target fs only when first time usage call come to particular
target fs scheme.
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