xiaoyuyao 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_r338740381
##########
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:
The document says existing value(keyset) will be returned. So the line 74-75
is not necessary.
Returns:
the current (existing or computed) value associated with the specified key,
A good example can be found here: https://stackoverflow.com/a/39268896
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