busbey commented on a change in pull request #2685:
URL: https://github.com/apache/hbase/pull/2685#discussion_r527967454
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File path: hbase-client/src/main/java/org/apache/hadoop/hbase/util/PoolMap.java
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@@ -45,177 +36,138 @@
* key. A size of {@link Integer#MAX_VALUE} is interpreted as an unbounded
pool.
* </p>
*
+ * <p>
+ * PoolMap is thread-safe. It does not remove elements automatically. Unused
resources
+ * must be closed and removed explicitly.
+ * </p>
Review comment:
now that this is thread-safe can we remove the synchronization around
the instance that's in `AbstractRpcClient`?
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