runzhiwang opened a new pull request #240: [LIVY-541] Generate the unqiue session id when multiple livy servers work at the same time URL: https://github.com/apache/incubator-livy/pull/240 ## What changes were proposed in this pull request? [LIVY-541] Generate the unqiue session id when multiple livy servers work at the same time 1. When generate unique session id with multiple livy servers working. First, get the distributed lock, Second, get the session id from the filesystem or zookeeper. Third, increase the sessionid and save it in the filesystem or zookeeper. Forth, release the distributed lock. 2. ZooKeeperManager provides the distributed lock to generate the unique session id. 3. If set recovery.mode = off, i.e. generate session id in BlackholeStateStore, and set multi-active.enabled = true, store the session id in zookeeper. If set recovery.mode = off, and set multi-active.enabled = false, store the session id in memory, i.e. stateMap ## How was this patch tested? 1. Start multiple livy server and set multi-active.enabled = true. 2. Set zookeeper.url or state-store.url to save session id. 3. Create session in different livy servers at the same time. 4. Check the session id without duplicating.
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