timmylicheng commented on a change in pull request #28: HDDS-1569 Support
creating multiple pipelines with same datanode
URL: https://github.com/apache/hadoop-ozone/pull/28#discussion_r335890352
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File path:
hadoop-hdds/server-scm/src/main/java/org/apache/hadoop/hdds/scm/pipeline/PipelinePlacementPolicy.java
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@@ -76,11 +79,34 @@ public PipelinePlacementPolicy(
* Returns true if this node meets the criteria.
*
* @param datanodeDetails DatanodeDetails
+ * @param nodesRequired nodes required count
* @return true if we have enough space.
*/
@VisibleForTesting
- boolean meetCriteria(DatanodeDetails datanodeDetails, long heavyNodeLimit) {
- return (nodeManager.getPipelinesCount(datanodeDetails) <= heavyNodeLimit);
+ boolean meetCriteria(DatanodeDetails datanodeDetails, int nodesRequired) {
+ if (heavyNodeCriteria == 0) {
+ // no limit applied.
+ return true;
+ }
+ // Datanodes from pipeline in some states can also be considered available
+ // for pipeline allocation. Thus the number of these pipeline shall be
+ // deducted from total heaviness calculation.
+ int pipelineNumDeductable = (int)stateManager.getPipelines(
+ HddsProtos.ReplicationType.RATIS,
+ HddsProtos.ReplicationFactor.valueOf(nodesRequired),
+ Pipeline.PipelineState.CLOSED)
+ .stream().filter(
+ p -> nodeManager.getPipelines(datanodeDetails).contains(p.getId()))
Review comment:
As I looked a little deeper, changing Node2PipelineMap mapping may affect
more than this commit. Shall we have a separate discussion on the internal data
structure for NodeStateManager?
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