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_r337866903
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File path:
hadoop-hdds/server-scm/src/main/java/org/apache/hadoop/hdds/scm/node/states/Node2PipelineMap.java
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@@ -71,6 +71,10 @@ public synchronized void addPipeline(Pipeline pipeline) {
UUID dnId = details.getUuid();
dn2ObjectMap.computeIfAbsent(dnId, k -> ConcurrentHashMap.newKeySet())
.add(pipeline.getId());
+ dn2ObjectMap.computeIfPresent(dnId, (k, v) -> {
+ v.add(pipeline.getId());
Review comment:
Line 73 is adding v to new keyset when key is absent and line 75 is adding v
to the existing keyset. Reason why we don't have to have extra if here is
computeIfAbsent and computeIfPresent are both judging if key is present or not.
So we don't have to see if Map.get(k) is null.
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