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Check and clean nodes which were created by the server, but client is not aware of it #237
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…ut client is no more aware of it
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If the node potentially was created by the server, but then client returned an error (e.g. ErrConnectionClose because of networking glitch), the node remains bound to the restored session and prevents acquisition of newer locks, since according to zk recipes for locks, there is a watch created on that node within the following lock, which dead locks further lock acquisition.
it fixes #229