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Symptoms

Confluence experiences slow performance at regular intervals. Thread dumps, taken across time, show this thread:

Cause

The index optimisation job is running and causing a backlog.

Diagnosis

Add debug level logging for the following class:

Watch at 03:00:00 and 15:00:00 for these threads. If you're noticing long delays until the next DEBUG level instance of this class, it may be a culprit.

Alternatively, watch for the thread above in your thread dumps.

Resolution

By default, the indexOptimizerTrigger is set to run at 3am and 3pm daily. Configure the index optimisation to run once a week, or less often.

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