[GitHub] [accumulo] keith-turner edited a comment on pull request #2096: External Compactions

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keith-turner edited a comment on pull request #2096:
URL: https://github.com/apache/accumulo/pull/2096#issuecomment-842394039


   >  it seems that the way the external compactions are exposed through to the user in the compaction configuration is through the specially named externalQueue, which seems to be a special feature of the default compaction service. Is that correct?
   
   Its a feature of the default compaction planner, not the default compaction service.  Each compaction service has a configured planner that decides what to compact where.  The [default compaction planner](https://github.com/apache/accumulo/blob/3983cd23629789c1ed0020d01fdd968eabfe590f/core/src/main/java/org/apache/accumulo/core/spi/compaction/DefaultCompactionPlanner.java#L73) accepts the config externalQueue.  It then takes this information and calls the SPI method [getExternalExecutor](https://github.com/apache/accumulo/blob/3983cd23629789c1ed0020d01fdd968eabfe590f/core/src/main/java/org/apache/accumulo/core/spi/compaction/ExecutorManager.java#L38).  Anyone could write a compaction planner that uses external queues by calling this same SPI method.  The planners configuration could work any way the author likes.


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