huijunw commented on issue #2907: stuck stmgr due to zk client destructor URL: https://github.com/apache/incubator-heron/issues/2907#issuecomment-391482300 two questions: 1. why is zookeeper not single thread ? `libzookeeper_mt` vs `libzookeeper_st` 2. if multi thread zk client is expected, how to solve the race condition? blind guess: delete piper after zookeeper_close() https://github.com/apache/incubator-heron/blob/0.17.8/heron/common/src/cpp/zookeeper/zkclient.cpp#L146
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