Github user aarondav commented on a diff in the pull request:
https://github.com/apache/spark/pull/3625#discussion_r21406649
--- Diff:
network/common/src/main/java/org/apache/spark/network/client/TransportClientFactory.java
---
@@ -97,23 +116,45 @@ public TransportClient createClient(String remoteHost,
int remotePort) throws IO
// Get connection from the connection pool first.
// If it is not found or not active, create a new one.
final InetSocketAddress address = new InetSocketAddress(remoteHost,
remotePort);
- TransportClient cachedClient = connectionPool.get(address);
+
+ // Create the ClientPool if we don't have it yet.
+ ClientPool clientPool = connectionPool.get(address);
+ if (clientPool == null) {
+ clientPool = connectionPool.putIfAbsent(address, new ClientPool());
--- End diff --
putIfAbsent returns the *previous* value, so this would be null
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