[jira] [Created] (CONNECTORS-1118) Documents processed by the shared drive connector incur an unnecessary synchronisation hit

["Aeham Abushwashi (JIRA)" <ji...@apache.org>]

Aeham Abushwashi created CONNECTORS-1118:
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             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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