[GitHub] [incubator-druid] gianm commented on a change in pull request #7154: rename maintenance mode to decommission

[GitBox <gi...@apache.org>]

gianm commented on a change in pull request #7154: rename maintenance mode to decommission
URL: https://github.com/apache/incubator-druid/pull/7154#discussion_r263623977
 
 

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 File path: docs/content/configuration/index.md
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 @@ -803,9 +803,9 @@ Issuing a GET request at the same URL will return the spec that is currently in
 |`killDataSourceWhitelist`|List of dataSources for which kill tasks are sent if property `druid.coordinator.kill.on` is true. This can be a list of comma-separated dataSources or a JSON array.|none|
 |`killAllDataSources`|Send kill tasks for ALL dataSources if property `druid.coordinator.kill.on` is true. If this is set to true then `killDataSourceWhitelist` must not be specified or be empty list.|false|
 |`killPendingSegmentsSkipList`|List of dataSources for which pendingSegments are _NOT_ cleaned up if property `druid.coordinator.kill.pendingSegments.on` is true. This can be a list of comma-separated dataSources or a JSON array.|none|
-|`maxSegmentsInNodeLoadingQueue`|The maximum number of segments that could be queued for loading to any given server. This parameter could be used to speed up segments loading process, especially if there are "slow" processes in the cluster (with low loading speed) or if too much segments scheduled to be replicated to some particular node (faster loading could be preferred to better segments distribution). Desired value depends on segments loading speed, acceptable replication time and number of processes. Value 1000 could be a start point for a rather big cluster. Default value is 0 (loading queue is unbounded) |0|
-|`historicalNodesInMaintenance`| List of Historical nodes in maintenance mode. Coordinator doesn't assign new segments on those nodes and moves segments from the nodes according to a specified priority.|none|
-|`nodesInMaintenancePriority`| Priority of segments from servers in maintenance. Coordinator takes ceil(maxSegmentsToMove * (priority / 10)) from servers in maitenance during balancing phase, i.e.:<br>0 - no segments from servers in maintenance will be processed during balancing<br>5 - 50% segments from servers in maintenance<br>10 - 100% segments from servers in maintenance<br>By leveraging the priority an operator can prevent general nodes from overload or decrease maitenance time instead.|7|
+|`maxSegmentsInNodeLoadingQueue`|The maximum number of segments that could be queued for loading to any given server. This parameter could be used to speed up segments loading process, especially if there are "slow" nodes in the cluster (with low loading speed) or if too much segments scheduled to be replicated to some particular node (faster loading could be preferred to better segments distribution). Desired value depends on segments loading speed, acceptable replication time and number of nodes. Value 1000 could be a start point for a rather big cluster. Default value is 0 (loading queue is unbounded) |0|
+|`decommissioningNodes`| List of historical servers to 'decommission'. Coordinator will not assign new segments to 'decomissioning' servers,  and segments will be moved away from them to be placed on 'active' servers at the maximum rate specified by `decommissioningMaxPercentOfMaxSegmentsToMove`.|none|
+|`decommissioningMaxPercentOfMaxSegmentsToMove`|  The maximum number of segments that may be moved away from 'decommissioning' servers to non-decommissioning (that is, active) servers during one Coordinator's run. This value is relative to the total maximum segment movements allowed during one run which is determined by `maxSegmentsToMove`. If `decommissioningMaxPercentOfMaxSegmentsToMove` is 0, segments will neither be moved from _or to_ 'decommissioning' servers, effectively putting them in a sort of 'maintenance' mode that will not participate in balancing or assignment by load rules. Decommissioning can also become stalled if there are no available active servers to place the segments. By leveraging decommissioning percent, an operator can prevent active servers from overload by prioritizing balancing, or decrease decommissioning time instead. The value should be between 0 and 100.|70|
 
 Review comment:
   @clintropolis's proposed wording looks good to me.

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