[
https://issues.apache.org/jira/browse/HDDS-1577?focusedWorklogId=303439&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-303439
]
ASF GitHub Bot logged work on HDDS-1577:
----------------------------------------
Author: ASF GitHub Bot
Created on: 29/Aug/19 07:44
Start Date: 29/Aug/19 07:44
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_r318928096
##########
File path:
hadoop-hdds/server-scm/src/main/java/org/apache/hadoop/hdds/scm/pipeline/PipelinePlacementPolicy.java
##########
@@ -0,0 +1,237 @@
+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 viable nodes that either don't have enough size left
+ * or are 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 {
Review comment:
I agree the overall policy interface needs to be refactored and renamed. I
would say SCMCommonPolicy would be a great base and maybe we can even have a
OzoneNodesDistributionCommonPolicy.
This will be tracked in https://issues.apache.org/jira/browse/HDDS-1571.
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Issue Time Tracking
-------------------
Worklog Id: (was: 303439)
Time Spent: 1h (was: 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: 1h
> 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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