Steve Loughran created HADOOP-15606:
---------------------------------------
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
--
This message was sent by Atlassian JIRA
(v7.6.3#76005)
---------------------------------------------------------------------
To unsubscribe, e-mail: [email protected]
For additional commands, e-mail: [email protected]
