Oliver Caballero Alvarez created HADOOP-19200:
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Summary: Reduce the number of headObject when opening a file with
the s3 file system
Key: HADOOP-19200
URL: https://issues.apache.org/jira/browse/HADOOP-19200
Project: Hadoop Common
Issue Type: Improvement
Components: fs/s3
Affects Versions: 3.3.6, 3.4.0
Reporter: Oliver Caballero Alvarez
In the implementation of the S3 filesystem, of the hadoop aws package, if you
use it with spark, every time you open a file for anything you will have to
send two Head Objects, since to open the file, you will first look to see if
this file exists, executing a HeadObject, and then when opening it, the
implementation, both of sdk1 and sdk2, forces you to make a head object again.
This is not the fault of the implementation of this class (S3AFileSystem), but
of the abstract FileSystem class of the Hadoop core, since it does not allow
the FileStatus to be passed but only allows the use of Path.
If the FileSystem implementation is changed, it could be used to not have to
request that HeadObject again.
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