[GitHub] [accumulo-website] dlmarion commented on a change in pull request #282: Documentation for external compactions

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dlmarion commented on a change in pull request #282:
URL: https://github.com/apache/accumulo-website/pull/282#discussion_r630387173



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File path: _docs-2/administration/compaction.md
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@@ -62,6 +68,151 @@ For more information see the javadoc for {% jlink org.apache.accumulo.core.spi.c
 
 The names of the compaction services and executors are used for logging and metrics.
 
+## External Compactions
+
+In Accumulo 2.1 we introduced a new optional feature that allows compactions to run
+outside of the Tablet Server.  External compactions introduces two new server processes
+in an Accumulo deployment:
+
+  * *Compactor*: Accumulo process that runs external compactions and is started with the name of a queue for which it will perform compactions.  In a typical deployment there will be many of these processes running, some for queue A, queue B, etc.  This process will only run a single compaction at a time and will communicate with the Compaction Coordinator to get a compaction job and report its status.
+
+  * *Compaction Coordinator*: a process that manages the compaction queues for all external compactions in the system and assigns compaction jasks to Compactors. In a typical deployment there will be one instance of this process in use at a time with a backup process waiting to become primary (much like the primary and secondary manager processes). This process communicates with the TabletServers to get external compaction job information and report back their status. 

Review comment:
       good catch. I will fix. Thanks!




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