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From "Stefan Richter (JIRA)" <j...@apache.org>
Subject [jira] [Closed] (FLINK-6776) Use skip instead of seek for small forward repositioning in DFS streams
Date Thu, 15 Jun 2017 08:50:00 GMT

     [ https://issues.apache.org/jira/browse/FLINK-6776?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Stefan Richter closed FLINK-6776.
---------------------------------
       Resolution: Implemented
    Fix Version/s: 1.4.0

Implemented in 9141379f6d

> Use skip instead of seek for small forward repositioning in DFS streams
> -----------------------------------------------------------------------
>
>                 Key: FLINK-6776
>                 URL: https://issues.apache.org/jira/browse/FLINK-6776
>             Project: Flink
>          Issue Type: Improvement
>          Components: State Backends, Checkpointing
>            Reporter: Stefan Richter
>            Assignee: Stefan Richter
>            Priority: Minor
>             Fix For: 1.4.0
>
>
> Reading checkpoint meta data and finding key-groups in restores sometimes require to
seek in input streams. Currently, we always use a seek, even for small position changes. As
small true seeks are far more expensive than small reads/skips, we should just skip over small
gaps instead of performing the seek.



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