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Posted to dev@apex.apache.org by "Chandni Singh (JIRA)" <ji...@apache.org> on 2016/04/22 19:27:12 UTC

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

Chandni Singh created APEXMALHAR-2063:
-----------------------------------------

             Summary: 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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