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Posted to common-issues@hadoop.apache.org by "Steve Loughran (JIRA)" <ji...@apache.org> on 2018/07/14 15:37:00 UTC
[jira] [Created] (HADOOP-15606) FSDataInputStream/FSInputStream to
implement a length()/size() method for amount of data
Steve Loughran created HADOOP-15606:
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Summary: FSDataInputStream/FSInputStream to implement a length()/size() method for amount of data
Key: HADOOP-15606
URL: https://issues.apache.org/jira/browse/HADOOP-15606
Project: Hadoop Common
Issue Type: Improvement
Components: fs, fs/s3
Affects Versions: 3.1.0
Reporter: Steve Loughran
server-side transcoding, predicate-pushdown filtering in storage, client-side decryption can all result in an input stream shorter or longer than the file size as measured in getFileStatus/listFiles/listStatus.
Assuming the length is known once open() returns, the FSDataInputStream can return the length of the data, which can then be used for accurate seeks within the data.
* requires the streams to know their length; easy to check (hasCapabilities), or make the new method return an Optional<Long>, but caller will need to (a) look for this if present and (b) fall back.
* Could be rolled out for all our own clients/connectors, would take time for others
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