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https://issues.apache.org/jira/browse/STORM-1971?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15382300#comment-15382300
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Aaron Dossett commented on STORM-1971:
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[~darion] There is a default value for the tick tuples, 15 seconds.
https://github.com/apache/storm/blob/master/external/storm-hdfs/src/main/java/org/apache/storm/hdfs/bolt/AbstractHdfsBolt.java#L57
The tick tuple approach guarantees a sync at a defined interval. A solution
based on SyncPolicy can't do that because it can only trigger when a tuple is
being processed.
> HDFS Timed Synchronous Policy
> -----------------------------
>
> Key: STORM-1971
> URL: https://issues.apache.org/jira/browse/STORM-1971
> Project: Apache Storm
> Issue Type: Bug
> Components: storm-hdfs
> Affects Versions: 0.10.0, 1.0.0
> Reporter: darion yaphet
> Assignee: darion yaphet
>
> When the data need to be wrote to HDFS is not very large in quantity . We
> need a timed synchronous policy to flush cached date into HDFS periodically.
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