[jira] [Commented] (APEXMALHAR-2063) Integrate WAL to FS WindowDataManager

["Chandni Singh (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/APEXMALHAR-2063?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15254325#comment-15254325 ] 

Chandni Singh commented on APEXMALHAR-2063:
-------------------------------------------

Will also move WindowDataManager to the new package structure:
org.apache.apex.malhar.lib.wal

> Integrate WAL to FS WindowDataManager
> -------------------------------------
>
>                 Key: APEXMALHAR-2063
>                 URL: https://issues.apache.org/jira/browse/APEXMALHAR-2063
>             Project: Apache Apex Malhar
>          Issue Type: Improvement
>            Reporter: Chandni Singh
>            Assignee: Chandni Singh
>
> FS Window Data Manager is used to save meta-data that helps in replaying tuples every completed application window after failure. For this it saves meta-data in a file per window. Having multiple small size files on hdfs cause issues as highlighted here:
> http://blog.cloudera.com/blog/2009/02/the-small-files-problem/
> Instead FS Window Data Manager can utilize the WAL to write data and maintain a mapping of how much data was flushed to WAL each window.



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