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https://issues.apache.org/jira/browse/BEAM-1065?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15712452#comment-15712452
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Daniel Halperin commented on BEAM-1065:
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The ability to open at a non-zero location has previously been thought to be
linked to seekability. Do we think there are channels that can be opened at
non-0 offsets but cannot be seeked?
> FileBasedSource: replace SeekableByteChannel with open(spec, startingPosition)
> ------------------------------------------------------------------------------
>
> Key: BEAM-1065
> URL: https://issues.apache.org/jira/browse/BEAM-1065
> Project: Beam
> Issue Type: Sub-task
> Components: sdk-java-core
> Reporter: Pei He
> Assignee: Pei He
>
> FileBasedReader should be able to open the file with the
> Source.getStartOffset(), and then read forward to find the first input
> element.
> The benefits are:
> 1. It is easier to implement a ReadableByteChannel.
> 2. Dynamically splitting won't require file systems to support seeking.
> 3. Doesn't need to seek to position twice, which is what current API does.
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