You are viewing a plain text version of this content. The canonical link for it is here.
Posted to issues@flink.apache.org by "Huyen Levan (JIRA)" <ji...@apache.org> on 2018/07/27 11:59:00 UTC
[jira] [Commented] (FLINK-9940) File source continuous monitoring
mode: S3 files sometimes missed
[ https://issues.apache.org/jira/browse/FLINK-9940?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16559639#comment-16559639 ]
Huyen Levan commented on FLINK-9940:
------------------------------------
I'm currently working on a fix for this bug. However, I could not assign it to myself.
> File source continuous monitoring mode: S3 files sometimes missed
> -----------------------------------------------------------------
>
> Key: FLINK-9940
> URL: https://issues.apache.org/jira/browse/FLINK-9940
> Project: Flink
> Issue Type: Bug
> Components: Streaming
> Affects Versions: 1.5.1
> Environment: Flink 1.5, EMRFS
> Reporter: Huyen Levan
> Priority: Major
> Labels: EMRFS, Flink, S3
>
> When using StreamExecutionEnvironment.readFile() with FileProcessingMode.PROCESS_CONTINUOUSLY mode to monitor an S3 prefix, if there is a high amount of new/modified files at the same time, the directory monitoring process might miss some files. The number of missing files depends on the monitoring interval.
> Cause: Flink tracks which files it has read by remembering the modification time of the file that was added (or modified) last. So when there are multiple files having a same last-modified timestamp.
> Suggested solution (thanks to [[Fabian Hueske|http://apache-flink-user-mailing-list-archive.2336050.n4.nabble.com/template/NamlServlet.jtp?macro=user_nodes&user=25]|http://apache-flink-user-mailing-list-archive.2336050.n4.nabble.com/template/NamlServlet.jtp?macro=user_nodes&user=25]): a hybrid approach that keeps the names of all files that have a mod timestamp that is larger than the max mod time minus an offset. _org.apache.flink.streaming.api.functions.source.ContinuousFileMonitoringFunction_
--
This message was sent by Atlassian JIRA
(v7.6.3#76005)