agura commented on a change in pull request #6976: IGNITE-6804 Warning if
unordered map used in locking cache operation.
URL: https://github.com/apache/ignite/pull/6976#discussion_r372385696
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File path: modules/core/src/main/java/org/apache/ignite/IgniteCache.java
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@@ -1099,6 +1112,11 @@
/**
* {@inheritDoc}
+ * <p>
+ * Keys are locked in the order in which they appear in key set. It is
caller's responsibility to
+ * make sure keys always follow same order, such as by using {@link
TreeSet}. Using unordered map,
+ * such as {@link HashSet}, while calling this method in parallel <b>will
lead to deadlock</b>.
Review comment:
Please add imports for `HashSet` and `TreeSet` or use fully qualified name.
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