Zhou created HIVE-24206:
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Summary: DefaultGraphWalker IdentityHashMap causes thread idling
Key: HIVE-24206
URL: https://issues.apache.org/jira/browse/HIVE-24206
Project: Hive
Issue Type: Bug
Components: Parser
Affects Versions: 2.3.4
Environment: my code is :
ParseDriver pd = new ParseDriver();
ASTNode tree = pd.parse(query, context);
while ((tree.getToken() == null) && (tree.getChildCount() > 0)) {
tree = (ASTNode) tree.getChild(0);
}
Map<Rule, NodeProcessor> rules = new LinkedHashMap<>();
Dispatcher disp = new DefaultRuleDispatcher(this, rules, null);
GraphWalker ogw = new DefaultGraphWalker(disp);
List<Node> topNodes = new ArrayList<>();
topNodes.add(tree);
ogw.startWalking(topNodes, null);
Reporter: Zhou
the sql is very long，about 3M size，use hive parse to parse the sql, it costs
more than one hour to finish it. The reason is hive parse use IdentityHashMap,
is not multi-thread safe, than it costs more than one hour to execute the code
"while(true)"
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