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Zookeeper >> mail # user >> nodes were erased after restart.

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nodes were erased after restart.
Hi all,

I'm using zooKeeper as a message queue, creating each task as a
persistent_sequential node under a folder (another node
created in persistent mode). It works well. However, once a reboot happened
on the server, the nodes will be lost.

Is  there a setting in zooKeeper so that the nodes won't be erased?

Thank you.