kaisun2000 commented on a change in pull request #642: Fix handleNewSession
creating ephemeral node with expired session
URL: https://github.com/apache/helix/pull/642#discussion_r362994414
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File path:
helix-core/src/main/java/org/apache/helix/manager/zk/ParticipantManager.java
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@@ -97,10 +97,28 @@ public ParticipantManager(HelixManager manager,
HelixZkClient zkclient, int sess
}
/**
- * Handle new session for a participang.
+ * Handles a new session for a participant.
+ *
+ * @deprecated
+ * This is deprecated. Instead, please use {@link #handleNewSession(String)}
which takes care of
+ * potential session race condition issue.
+ *
* @throws Exception
*/
+ @Deprecated
public void handleNewSession() throws Exception {
+ handleNewSession(null);
+ }
+
+ /**
+ * Handles a new session for a participant. The new session's id has to be
passed in, as it is
+ * required in {@link #createLiveInstance(String)} to prevent ephemeral node
creation from session
+ * race condition: ephemeral node is created by an expired or unexpected
session.
+ *
+ * @param sessionId the new session's ID
+ * @throws Exception if any exception occurs
+ */
+ public void handleNewSession(final String sessionId) throws Exception {
joinCluster();
Review comment:
can _zkClient.getSessionId() == 0?
I think they can. We should do nothing here then.
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