sodonnel commented on a change in pull request #1551: HDDS-2199 In
SCMNodeManager dnsToUuidMap cannot track multiple DNs on the same host
URL: https://github.com/apache/hadoop/pull/1551#discussion_r330585772
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File path:
hadoop-hdds/server-scm/src/main/java/org/apache/hadoop/hdds/scm/node/SCMNodeManager.java
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@@ -275,6 +278,26 @@ public RegisteredCommand register(
.build();
}
+ /**
+ * Add an entry to the dnsToUuidMap, which maps hostname / IP to the DNs
+ * running on that host. As each address can have many DNs running on it,
+ * this is a one to many mapping.
+ * @param dnsName String representing the hostname or IP of the node
+ * @param uuid String representing the UUID of the registered node.
+ */
+ @SuppressFBWarnings(value="AT_OPERATION_SEQUENCE_ON_CONCURRENT_ABSTRACTION",
+ justification="The method is synchronized and this is the only place "+
+ "dnsToUuidMap is modified")
+ private synchronized void addEntryTodnsToUuidMap(
+ String dnsName, String uuid) {
+ Set<String> dnList = dnsToUuidMap.get(dnsName);
+ if (dnList == null) {
+ dnList = new HashSet<>();
Review comment:
I have fixed this one by creating a set with ConcurrentHashMap.newKeySet();
which create a Concurrent set.
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