[METRON-227] Add Time-Based Flushing to Writer Bolt

• Type: Bug
• Status: Done
• Priority: Major
• Resolution: Done
• Assignee: Matthew Foley
• Reporter: Domenic Puzio
• Created: 15/Jun/16 18:21
• Updated: 23/Nov/16 15:09
• Resolved: 12/Oct/16 17:20

Description

We need to change the BulkMessageWriterBolt and BulkWriterComponent to use time-based flushing when writing data to Elasticsearch or Solr.

Currently, we set a batch size, and the Writer waits for that number of tuples to build up; however, Storm has a timeout value that prevents it from waiting for too long. If the Writer does not get the batch size before the timeout, then it recycles the tuples through the topology. In addition, Storm only allows so many pending messages that have not been acked - if too many messages are waiting for the bulk Writer, then it will recycle them through the topology. This is not desired behavior and directly impacts the performance of this Writer. We would like to be able to specify a unit of time for which the topology would flush, writing the data it's currently holding to Elasticsearch or Solr even if the batch size is not met.

Issue Links

• is related to: METRON-322 Global Batching and Flushing
• links to: GitHub Pull Request #188
• links to: GitHub Pull Request #194