[jira] Updated: (AVRO-652) Expose sync points in DataFileReader

["Stu Hood (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/AVRO-652?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Stu Hood updated AVRO-652:
--------------------------

    Component/s: java

> Expose sync points in DataFileReader
> ------------------------------------
>
>                 Key: AVRO-652
>                 URL: https://issues.apache.org/jira/browse/AVRO-652
>             Project: Avro
>          Issue Type: New Feature
>          Components: java
>            Reporter: Stu Hood
>            Priority: Minor
>
> DataFileReader.blockStart is hidden from the caller, but exposing it (as readonly) would allow callers to discover sync points in a file by watching it for changes.
> seek(long) only takes an exact block boundary, while sync(long) moves to the next block boundary. There does not appear to be a way to rediscover points that you can seek() to, which would be very useful for building or recovering an index for a file.

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