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https://issues.apache.org/jira/browse/FLINK-6776?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16047643#comment-16047643
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ASF GitHub Bot commented on FLINK-6776:
---------------------------------------
Github user tillrohrmann commented on a diff in the pull request:
https://github.com/apache/flink/pull/4019#discussion_r121627538
--- Diff:
flink-runtime/src/main/java/org/apache/flink/runtime/fs/hdfs/HadoopDataInputStream.java
---
@@ -31,11 +31,15 @@
*/
public final class HadoopDataInputStream extends FSDataInputStream {
+ /** Minimum amount of bytes to skip forward before we issue a seek
instead of discarding read */
+ private static final int MIN_SKIP_BYTES = 1024 * 1024;
--- End diff --
How have you come up with this number?
> 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
>
> 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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