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From "Aeham Abushwashi (JIRA)" <j...@apache.org>
Subject [jira] [Created] (CONNECTORS-1118) Documents processed by the shared drive connector incur an unnecessary synchronisation hit
Date Tue, 09 Dec 2014 15:21:12 GMT
Aeham Abushwashi created CONNECTORS-1118:
--------------------------------------------

             Summary: Documents processed by the shared drive connector incur an unnecessary
synchronisation hit
                 Key: CONNECTORS-1118
                 URL: https://issues.apache.org/jira/browse/CONNECTORS-1118
             Project: ManifoldCF
          Issue Type: Improvement
          Components: Framework core
    Affects Versions: ManifoldCF 1.7.2
            Reporter: Aeham Abushwashi


Each document processed by the shared drive connector is passed through SharedDriveConnector#checkInclude
to verify whether the document is eligible for ingestion. The calls made here to WorkerThread$ProcessActivity#checkMimeTypeIndexable
and WorkerThread$ProcessActivity#checkLengthIndexable are unnecessarily costly as they each
create a fresh instance of IncrementalIngester$PipelineConnections on every call. The constructor
of IncrementalIngester$PipelineConnections can be very expensive due to the loading of output
connection objects, which in turn requires some locking (via ZK - in a distrubuted environment).

The other area of inefficiency is in WorkerThread$ProcessActivity#processDocumentReferences.
This method creates new instances of PriorityCalculator using the less-efficient 3-arg constructor.
This can be addressed using the same pattern implemented for CONNECTORS-1094

To highlight the impact of the above calls, I profiled an active worker thread for 40 minutes.
During that window, it spent ~23 minutes in SharedDriveConnector#checkInclude and its callees
+ 9 minutes creating instances of PriorityCalculator.

I've seen the above issues when using the shared drive connector but I think other connectors
too could be impacted - depending on how they're implemented.



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