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Posted to reviews@helix.apache.org by GitBox <gi...@apache.org> on 2020/12/16 19:43:14 UTC
[GitHub] [helix] pkuwm commented on issue #1525: Support getting a large number of children using pagination
pkuwm commented on issue #1525:
URL: https://github.com/apache/helix/issues/1525#issuecomment-746900960
As a record, pasted the log for the case that if the API called is unimplemented on the zk server, the session will be disconnected. The zkClient needs to wait for reconnection to be able to call getChildren on server.
```
2020-12-15 17:24:16,558 [TestNGInvoker-testGetChildrenOnLargeNumChildren()] INFO org.apache.helix.zookeeper.zkclient.ZkConnection - Pagination config zk.getChildren.pagination.disabled=false, method to be invoked: getAllChildrenPaginated
2020-12-15 17:24:16,577 [TestNGInvoker-testGetChildrenOnLargeNumChildren(localhost:2121)] WARN org.apache.zookeeper.ClientCnxn - Session 0x17668ca649f0005 for sever localhost:2121, Closing socket connection. Attempting reconnect except it is a SessionExpiredException.
EndOfStreamException: Unable to read additional data from server sessionid 0x17668ca649f0005, likely server has closed socket
at org.apache.zookeeper.ClientCnxnSocketNIO.doIO(ClientCnxnSocketNIO.java:77)
at org.apache.zookeeper.ClientCnxnSocketNIO.doTransport(ClientCnxnSocketNIO.java:350)
at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1275)
org.apache.zookeeper.KeeperException$UnimplementedException: KeeperErrorCode = Unimplemented for /testGetChildrenOnLargeNumChildren
2020-12-15 17:24:16,581 [TestNGInvoker-testGetChildrenOnLargeNumChildren()] WARN org.apache.helix.zookeeper.zkclient.ZkConnection - Paginated getChildren is unimplemented in ZK server! Falling back to non-paginated getChildren
==== calling getChildren
2020-12-15 17:24:16,684 [TestNGInvoker-testGetChildrenOnLargeNumChildren()-EventThread] INFO org.apache.helix.zookeeper.zkclient.ZkClient - zkclient 0, zookeeper state changed ( Disconnected )
2020-12-15 17:24:18,393 [TestNGInvoker-testGetChildrenOnLargeNumChildren(localhost:2121)] INFO org.apache.zookeeper.ClientCnxn - Opening socket connection to server hulu-localhost:2121.
```
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