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https://issues.apache.org/jira/browse/HDDS-1577?focusedWorklogId=306192&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-306192
]
ASF GitHub Bot logged work on HDDS-1577:
----------------------------------------
Author: ASF GitHub Bot
Created on: 04/Sep/19 08:46
Start Date: 04/Sep/19 08:46
Worklog Time Spent: 10m
Work Description: timmylicheng commented on pull request #1366:
HDDS-1577. Add default pipeline placement policy implementation.
URL: https://github.com/apache/hadoop/pull/1366#discussion_r320642122
##########
File path:
hadoop-hdds/server-scm/src/main/java/org/apache/hadoop/hdds/scm/pipeline/PipelinePlacementPolicy.java
##########
@@ -0,0 +1,291 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.hadoop.hdds.scm.pipeline;
+
+import com.google.common.annotations.VisibleForTesting;
+import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.hdds.protocol.DatanodeDetails;
+import org.apache.hadoop.hdds.protocol.proto.HddsProtos;
+import org.apache.hadoop.hdds.scm.ScmConfigKeys;
+import
org.apache.hadoop.hdds.scm.container.placement.algorithms.SCMCommonPolicy;
+import org.apache.hadoop.hdds.scm.container.placement.metrics.SCMNodeMetric;
+import org.apache.hadoop.hdds.scm.exceptions.SCMException;
+import org.apache.hadoop.hdds.scm.net.NetworkTopology;
+import org.apache.hadoop.hdds.scm.net.Node;
+import org.apache.hadoop.hdds.scm.node.NodeManager;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.List;
+import java.util.stream.Collectors;
+
+/**
+ * Pipeline placement policy that choose datanodes based on load balancing
+ * and network topology to supply pipeline creation.
+ * <p>
+ * 1. get a list of healthy nodes
+ * 2. filter out nodes that are not too heavily engaged in other pipelines
+ * 3. Choose an anchor node among the viable nodes which follows the algorithm
+ * described @SCMContainerPlacementCapacity
+ * 4. Choose other nodes around the anchor node based on network topology
+ */
+public final class PipelinePlacementPolicy extends SCMCommonPolicy {
+ @VisibleForTesting
+ static final Logger LOG =
+ LoggerFactory.getLogger(PipelinePlacementPolicy.class);
+ private final NodeManager nodeManager;
+ private final Configuration conf;
+ private final int heavyNodeCriteria;
+
+ /**
+ * Constructs a Container Placement with considering only capacity.
+ * That is this policy tries to place containers based on node weight.
+ *
+ * @param nodeManager Node Manager
+ * @param conf Configuration
+ */
+ public PipelinePlacementPolicy(final NodeManager nodeManager,
+ final Configuration conf) {
+ super(nodeManager, conf);
+ this.nodeManager = nodeManager;
+ this.conf = conf;
+ heavyNodeCriteria = conf.getInt(
+ ScmConfigKeys.OZONE_DATANODE_MAX_PIPELINE_ENGAGEMENT,
+ ScmConfigKeys.OZONE_DATANODE_MAX_PIPELINE_ENGAGEMENT_DEFAULT);
+ }
+
+ /**
+ * Returns true if this node meets the criteria.
+ *
+ * @param datanodeDetails DatanodeDetails
+ * @return true if we have enough space.
+ */
+ @VisibleForTesting
+ boolean meetCriteria(DatanodeDetails datanodeDetails,
+ long heavyNodeLimit) {
+ return (nodeManager.getPipelinesCount(datanodeDetails) <= heavyNodeLimit);
+ }
+
+ /**
+ * Filter out viable nodes based on
+ * 1. nodes that are healthy
+ * 2. nodes that are not too heavily engaged in other pipelines
+ *
+ * @param excludedNodes - excluded nodes
+ * @param nodesRequired - number of datanodes required.
+ * @return a list of viable nodes
+ * @throws SCMException when viable nodes are not enough in numbers
+ */
+ List<DatanodeDetails> filterViableNodes(
+ List<DatanodeDetails> excludedNodes, int nodesRequired)
+ throws SCMException {
+ // get nodes in HEALTHY state
+ List<DatanodeDetails> healthyNodes =
+ nodeManager.getNodes(HddsProtos.NodeState.HEALTHY);
+ if (excludedNodes != null) {
+ healthyNodes.removeAll(excludedNodes);
+ }
+ String msg;
+ if (healthyNodes.size() == 0) {
+ msg = "No healthy node found to allocate container.";
+ LOG.error(msg);
+ throw new SCMException(msg, SCMException.ResultCodes
+ .FAILED_TO_FIND_HEALTHY_NODES);
+ }
+
+ if (healthyNodes.size() < nodesRequired) {
+ msg = String.format("Not enough healthy nodes to allocate container. %d "
+ + " datanodes required. Found %d",
+ nodesRequired, healthyNodes.size());
+ LOG.error(msg);
+ throw new SCMException(msg,
+ SCMException.ResultCodes.FAILED_TO_FIND_SUITABLE_NODE);
+ }
+
+ // filter nodes that meet the size and pipeline engagement criteria.
+ // Pipeline placement doesn't take node space left into account.
+ List<DatanodeDetails> healthyList = healthyNodes.stream().filter(d ->
+ meetCriteria(d, heavyNodeCriteria)).collect(Collectors.toList());
+
+ if (healthyList.size() < nodesRequired) {
+ msg = String.format("Unable to find enough nodes that meet " +
+ "the criteria that cannot engage in more than %d pipelines." +
+ " Nodes required: %d Found: %d",
+ heavyNodeCriteria, nodesRequired, healthyList.size());
+ LOG.error(msg);
+ throw new SCMException(msg,
+ SCMException.ResultCodes.FAILED_TO_FIND_NODES_WITH_SPACE);
+ }
+ return healthyList;
+ }
+
+ /**
+ * Pipeline placement choose datanodes to join the pipeline.
+ *
+ * @param excludedNodes - excluded nodes
+ * @param favoredNodes - list of nodes preferred.
+ * @param nodesRequired - number of datanodes required.
+ * @param sizeRequired - size required for the container or block.
+ * @return a list of chosen datanodeDetails
+ * @throws SCMException when chosen nodes are not enough in numbers
+ */
+ @Override
+ public List<DatanodeDetails> chooseDatanodes(
+ List<DatanodeDetails> excludedNodes, List<DatanodeDetails> favoredNodes,
+ int nodesRequired, final long sizeRequired) throws SCMException {
+ // get a list of viable nodes based on criteria
+ List<DatanodeDetails> healthyNodes =
+ filterViableNodes(excludedNodes, nodesRequired);
+
+ List<DatanodeDetails> results = new ArrayList<>();
+
+ // First choose an anchor nodes randomly
+ DatanodeDetails anchor = chooseNode(healthyNodes);
+ if (anchor == null) {
+ LOG.error("Unable to find the first healthy nodes that " +
+ "meet the criteria. Required nodes: {}, Found nodes: {}",
+ nodesRequired, results.size());
+ throw new SCMException("Unable to find required number of nodes.",
+ SCMException.ResultCodes.FAILED_TO_FIND_SUITABLE_NODE);
+ }
+
+ results.add(anchor);
+ nodesRequired--;
+ for (int x = 0; x < nodesRequired; x++) {
+ // invoke the choose function defined in the derived classes.
+ DatanodeDetails pick =
Review comment:
Rack awareness is added. Will submit unit tests shortly.
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Issue Time Tracking
-------------------
Worklog Id: (was: 306192)
Time Spent: 5h (was: 4h 50m)
> Add default pipeline placement policy implementation
> ----------------------------------------------------
>
> Key: HDDS-1577
> URL: https://issues.apache.org/jira/browse/HDDS-1577
> Project: Hadoop Distributed Data Store
> Issue Type: Sub-task
> Components: SCM
> Reporter: Siddharth Wagle
> Assignee: Li Cheng
> Priority: Major
> Labels: pull-request-available
> Time Spent: 5h
> Remaining Estimate: 0h
>
> This is a simpler implementation of the PipelinePlacementPolicy that can be
> utilized if no network topology is defined for the cluster. We try to form
> pipelines from existing HEALTHY datanodes randomly, as long as they satisfy
> PipelinePlacementCriteria.
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