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Posted to common-issues@hadoop.apache.org by "Steve Loughran (JIRA)" <ji...@apache.org> on 2018/11/05 12:58:00 UTC
[jira] [Commented] (HADOOP-15606) FSDataInputStream/FSInputStream
to implement getFileLength()
[ https://issues.apache.org/jira/browse/HADOOP-15606?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16675101#comment-16675101 ]
Steve Loughran commented on HADOOP-15606:
-----------------------------------------
Proposed: add an interface for this so that other streams can implement it too
> FSDataInputStream/FSInputStream to implement getFileLength()
> ------------------------------------------------------------
>
> 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
> Priority: Major
>
> 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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