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https://issues.apache.org/jira/browse/FLINK-6776?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16029524#comment-16029524
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ASF GitHub Bot commented on FLINK-6776:
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GitHub user StefanRRichter opened a pull request:
https://github.com/apache/flink/pull/4019
[FLINK-6776] [runtime] Use skip instead of seek for small forward rep…
…ositioning in DFS streams
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.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/StefanRRichter/flink FLINK-6776
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/flink/pull/4019.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #4019
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commit 6251b2d68fa567bf7b04fca56bd74ef77bcb3114
Author: Stefan Richter <[email protected]>
Date: 2017-05-30T15:08:26Z
[FLINK-6776] [runtime] Use skip instead of seek for small forward
repositioning in DFS streams
----
> 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
>
> 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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