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Posted to issues@flink.apache.org by "ASF GitHub Bot (JIRA)" <ji...@apache.org> on 2018/12/18 23:03:00 UTC
[jira] [Updated] (FLINK-11196) Extend S3 EntropyInjector to use key
replacement (instead of key removal) when creating checkpoint metadata
files
[ https://issues.apache.org/jira/browse/FLINK-11196?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
ASF GitHub Bot updated FLINK-11196:
-----------------------------------
Labels: pull-request-available (was: )
> Extend S3 EntropyInjector to use key replacement (instead of key removal) when creating checkpoint metadata files
> -----------------------------------------------------------------------------------------------------------------
>
> Key: FLINK-11196
> URL: https://issues.apache.org/jira/browse/FLINK-11196
> Project: Flink
> Issue Type: Improvement
> Components: FileSystem
> Affects Versions: 1.7.0
> Reporter: Mark Cho
> Priority: Major
> Labels: pull-request-available
>
> We currently use S3 entropy injection when writing out checkpoint data.
> We also use external checkpoints so that we can resume from a checkpoint metadata file later.
> The current implementation of S3 entropy injector makes it difficult to locate the checkpoint metadata files since in the newer versions of Flink, `state.checkpoints.dir` configuration controls where the metadata and state files are written, instead of having two separate paths (one for metadata, one for state files).
> With entropy injection, we replace the entropy marker in the path specified by `state.checkpoints.dir` with entropy (for state files) or we strip out the marker (for metadata files).
>
> We need to extend the entropy injection so that we can replace the entropy marker with a predictable path (instead of removing it) so that we can do a prefix query for just the metadata files.
> By not using the entropy key replacement (defaults to empty string), you get the same behavior as it is today (entropy marker removed).
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