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https://issues.apache.org/jira/browse/ZOOKEEPER-2598?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15581870#comment-15581870
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Flavio Junqueira commented on ZOOKEEPER-2598:
---------------------------------------------

I wonder if this is an instance of ZOOKEEPER-1549.

> Data Inconsistency after power off/on of some nodes
> ---------------------------------------------------
>
>                 Key: ZOOKEEPER-2598
>                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-2598
>             Project: ZooKeeper
>          Issue Type: Bug
>          Components: quorum
>    Affects Versions: 3.5.1
>         Environment: ZK is running in a docker container on a Ubuntu 14.04 VM
>            Reporter: Srinivas Neginhal
>         Attachments: zk1.tgz, zk2.tgz, zk3.tgz
>
>
> Steps to reproduce:
> 1. Create a three node cluster: Node1, Node2 and Node3.
>     Each node is a VM that runs:
>     1. ZK in a docker container
>     2. Two clients, A and B that use ZK for group membership and leader 
> election. The clients create sequential ephemeral nodes when they come up. 
> 2. The three ZK's running in the containers form an ensemble.
> 3. Power off/on Node 2 and Node 3 in a loop
> 4. After a few times, the ephemeral nodes seen by the three nodes are 
> different.
> Here is the output of some four letter commands with the ensemble in the 
> state:
> 1. conf:
> ZK 1:
> # echo conf| nc 10.0.0.1 1300
> clientPort=1300
> secureClientPort=-1
> dataDir=/moot/persistentStore/zkWorkspace/version-2
> dataDirSize=67293721
> dataLogDir=/moot/persistentStore/zkWorkspace/version-2
> dataLogSize=67293721
> tickTime=2000
> maxClientCnxns=60
> minSessionTimeout=4000
> maxSessionTimeout=40000
> serverId=1
> initLimit=100
> syncLimit=20
> electionAlg=3
> electionPort=1200
> quorumPort=1100
> peerType=0
> membership: 
> server.1=10.0.0.1:1100:1200:participant;10.0.0.1:1300;8e64c644-d0fa-414f-bab2-3c8c80364410
> server.2=10.0.0.2:1100:1200:participant;10.0.0.2:1300;38bf19b8-d4cb-4dac-b328-7bbf0ee1e2c4
> server.3=10.0.0.3:1100:1200:participant;10.0.0.3:1300;e1415d59-e857-43e6-ba9b-01daeb31a434
> ZK 2:
> # echo conf| nc 10.0.0.2 1300
> clientPort=1300
> secureClientPort=-1
> dataDir=/moot/persistentStore/zkWorkspace/version-2
> dataDirSize=1409480873
> dataLogDir=/moot/persistentStore/zkWorkspace/version-2
> dataLogSize=1409480873
> tickTime=2000
> maxClientCnxns=60
> minSessionTimeout=4000
> maxSessionTimeout=40000
> serverId=2
> initLimit=100
> syncLimit=20
> electionAlg=3
> electionPort=1200
> quorumPort=1100
> peerType=0
> membership: 
> server.1=10.0.0.1:1100:1200:participant;10.0.0.1:1300;8e64c644-d0fa-414f-bab2-3c8c80364410
> server.2=10.0.0.2:1100:1200:participant;10.0.0.2:1300;38bf19b8-d4cb-4dac-b328-7bbf0ee1e2c4
> server.3=10.0.0.3:1100:1200:participant;10.0.0.3:1300;e1415d59-e857-43e6-ba9b-01daeb31a434
> ZK 3:
> # echo conf| nc 10.0.0.3 1300
> clientPort=1300
> secureClientPort=-1
> dataDir=/moot/persistentStore/zkWorkspace/version-2
> dataDirSize=1409505467
> dataLogDir=/moot/persistentStore/zkWorkspace/version-2
> dataLogSize=1409505467
> tickTime=2000
> maxClientCnxns=60
> minSessionTimeout=4000
> maxSessionTimeout=40000
> serverId=3
> initLimit=100
> syncLimit=20
> electionAlg=3
> electionPort=1200
> quorumPort=1100
> peerType=0
> membership: 
> server.1=10.0.0.1:1100:1200:participant;10.0.0.1:1300;8e64c644-d0fa-414f-bab2-3c8c80364410
> server.2=10.0.0.2:1100:1200:participant;10.0.0.2:1300;38bf19b8-d4cb-4dac-b328-7bbf0ee1e2c4
> server.3=10.0.0.3:1100:1200:participant;10.0.0.3:1300;e1415d59-e857-43e6-ba9b-01daeb31a434
> 2. mntr:
> ZK 1:
> # echo mntr| nc 10.0.0.1 1300
> zk_version 3.5.1-alpha--1, built on 09/07/2016 00:34 GMT
> zk_avg_latency 0
> zk_max_latency 471
> zk_min_latency 0
> zk_packets_received 32556
> zk_packets_sent 32564
> zk_num_alive_connections 7
> zk_outstanding_requests 0
> zk_server_state leader
> zk_znode_count 58
> zk_watch_count 51
> zk_ephemerals_count 5
> zk_approximate_data_size 5251
> zk_open_file_descriptor_count 52
> zk_max_file_descriptor_count 1048576
> zk_followers 2
> zk_synced_followers 2
> zk_pending_syncs 0
> ZK 2:
> # echo mntr| nc 10.0.0.2 1300
> zk_version 3.5.1-alpha--1, built on 09/07/2016 00:34 GMT
> zk_avg_latency 1
> zk_max_latency 227
> zk_min_latency 0
> zk_packets_received 30905
> zk_packets_sent 30936
> zk_num_alive_connections 6
> zk_outstanding_requests 0
> zk_server_state follower
> zk_znode_count 58
> zk_watch_count 82
> zk_ephemerals_count 5
> zk_approximate_data_size 5251
> zk_open_file_descriptor_count 49
> zk_max_file_descriptor_count 1048576
> ZK 3:
> # echo mntr| nc 10.0.0.3 1300
> zk_version 3.5.1-alpha--1, built on 09/07/2016 00:34 GMT
> zk_avg_latency 4
> zk_max_latency 590
> zk_min_latency 0
> zk_packets_received 6192
> zk_packets_sent 6191
> zk_num_alive_connections 2
> zk_outstanding_requests 0
> zk_server_state follower
> zk_znode_count 64
> zk_watch_count 17
> zk_ephemerals_count 11
> zk_approximate_data_size 5806
> zk_open_file_descriptor_count 45
> zk_max_file_descriptor_count 1048576
> 3. dump showing the inconsistency:
> ZK 1:
> # echo dump| nc 10.0.0.1 1300
> SessionTracker dump:
> Session Sets (17)/(12):
> 0 expire at Tue Sep 20 18:22:35 UTC 2016:
> 0 expire at Tue Sep 20 18:22:37 UTC 2016:
> 0 expire at Tue Sep 20 18:22:39 UTC 2016:
> 0 expire at Tue Sep 20 18:22:41 UTC 2016:
> 0 expire at Tue Sep 20 18:22:43 UTC 2016:
> 0 expire at Tue Sep 20 18:22:45 UTC 2016:
> 0 expire at Tue Sep 20 18:22:49 UTC 2016:
> 0 expire at Tue Sep 20 18:22:51 UTC 2016:
> 0 expire at Tue Sep 20 18:22:53 UTC 2016:
> 0 expire at Tue Sep 20 18:22:55 UTC 2016:
> 0 expire at Tue Sep 20 18:22:57 UTC 2016:
> 4 expire at Tue Sep 20 18:22:59 UTC 2016:
>  0x100061435f7000d
>  0x10000d9e4460004
>  0x100061435f70002
>  0x10000d9e4460003
> 4 expire at Tue Sep 20 18:23:03 UTC 2016:
>  0x2000001141a0002
>  0x2000001141a0000
>  0x2000001141a0005
>  0x100061435f70010
> 1 expire at Tue Sep 20 18:23:07 UTC 2016:
>  0x2000001141a0001
> 1 expire at Tue Sep 20 18:23:09 UTC 2016:
>  0x100061435f70000
> 1 expire at Tue Sep 20 18:23:11 UTC 2016:
>  0x2000001141a000f
> 1 expire at Tue Sep 20 18:23:13 UTC 2016:
>  0x300000188c30001
> ephemeral nodes dump:
> Sessions with Ephemerals (5):
> 0x100061435f70000:
>  /moot/gmle/ServiceDirectory/ActiveNodes/member0000000064
> 0x2000001141a000f:
>  /moot/gmle/ServiceDirectory/ActiveNodes/member0000000066
> 0x2000001141a0001:
>  /moot/gmle/ServiceDirectory/ActiveNodes/member0000000065
> 0x2000001141a0000:
>  /moot/gmle/ActiveControllerCluster/member0000000065
> 0x2000001141a0005:
>  /moot/gmle/ActiveControllerCluster/member0000000066
> Connections dump:
> Connections Sets (5)/(10):
> 0 expire at Tue Sep 20 18:22:35 UTC 2016:
> 1 expire at Tue Sep 20 18:22:45 UTC 2016:
>  ip: /10.0.0.1:45591 sessionId: 0x0
> 0 expire at Tue Sep 20 18:22:55 UTC 2016:
> 5 expire at Tue Sep 20 18:23:05 UTC 2016:
>  ip: /10.0.0.3:34734 sessionId: 0x100061435f7000d
>  ip: /10.0.0.1:42963 sessionId: 0x10000d9e4460003
>  ip: /10.0.0.3:34739 sessionId: 0x100061435f70010
>  ip: /10.0.0.2:45750 sessionId: 0x100061435f70002
>  ip: /10.0.0.1:42961 sessionId: 0x10000d9e4460004
> 1 expire at Tue Sep 20 18:23:15 UTC 2016:
>  ip: /10.0.0.1:42964 sessionId: 0x100061435f70000
> ZK 2:
> # echo dump| nc 10.0.0.2 1300
> SessionTracker dump:
> Global Sessions(13):
> 0x10000d9e4460003 30000ms
> 0x10000d9e4460004 30000ms
> 0x100061435f70000 40000ms
> 0x100061435f70002 30000ms
> 0x100061435f7000d 30000ms
> 0x100061435f70010 30000ms
> 0x100061435f70584 4000ms
> 0x2000001141a0000 40000ms
> 0x2000001141a0001 40000ms
> 0x2000001141a0002 30000ms
> 0x2000001141a0005 40000ms
> 0x2000001141a000f 40000ms
> 0x300000188c30001 40000ms
> ephemeral nodes dump:
> Sessions with Ephemerals (5):
> 0x100061435f70000:
>  /moot/gmle/ServiceDirectory/ActiveNodes/member0000000064
> 0x2000001141a000f:
>  /moot/gmle/ServiceDirectory/ActiveNodes/member0000000066
> 0x2000001141a0001:
>  /moot/gmle/ServiceDirectory/ActiveNodes/member0000000065
> 0x2000001141a0000:
>  /moot/gmle/ActiveControllerCluster/member0000000065
> 0x2000001141a0005:
>  /moot/gmle/ActiveControllerCluster/member0000000066
> Connections dump:
> Connections Sets (4)/(6):
> 0 expire at Tue Sep 20 18:25:13 UTC 2016:
> 1 expire at Tue Sep 20 18:25:23 UTC 2016:
>  ip: /10.0.0.2:38021 sessionId: 0x0
> 1 expire at Tue Sep 20 18:25:33 UTC 2016:
>  ip: /10.0.0.2:35422 sessionId: 0x2000001141a0002
> 4 expire at Tue Sep 20 18:25:43 UTC 2016:
>  ip: /10.0.0.2:35419 sessionId: 0x2000001141a0001
>  ip: /10.0.0.1:59025 sessionId: 0x2000001141a0000
>  ip: /10.0.0.2:35427 sessionId: 0x2000001141a0005
>  ip: /10.0.0.3:56967 sessionId: 0x2000001141a000f
> ZK 3:
> # echo dump| nc 10.0.0.3 1300
> SessionTracker dump:
> Global Sessions(23):
> 0x10000d9e4460003 30000ms
> 0x10000d9e4460004 30000ms
> 0x100055a50b00001 30000ms
> 0x100055a50b00003 40000ms
> 0x100055a50b0000c 40000ms
> 0x100061435f70000 40000ms
> 0x100061435f70002 30000ms
> 0x100061435f7000d 30000ms
> 0x100061435f70010 30000ms
> 0x100061435f70585 4000ms
> 0x2000001141a0000 40000ms
> 0x2000001141a0001 40000ms
> 0x2000001141a0002 30000ms
> 0x2000001141a0005 40000ms
> 0x2000001141a000f 40000ms
> 0x200000130750000 40000ms
> 0x200000130750001 40000ms
> 0x200000130750002 30000ms
> 0x200000130750004 40000ms
> 0x20000013075000d 30000ms
> 0x3000000e4860000 30000ms
> 0x3000000e4860002 40000ms
> 0x300000188c30001 40000ms
> ephemeral nodes dump:
> Sessions with Ephemerals (11):
> 0x100061435f70000:
>  /moot/gmle/ServiceDirectory/ActiveNodes/member0000000064
> 0x3000000e4860002:
>  /moot/gmle/ActiveControllerCluster/member0000000027
> 0x100055a50b0000c:
>  /moot/gmle/ServiceDirectory/ActiveNodes/member0000000027
> 0x100055a50b00003:
>  /moot/gmle/ActiveControllerCluster/member0000000025
> 0x200000130750004:
>  /moot/gmle/ActiveControllerCluster/member0000000026
> 0x200000130750000:
>  /moot/gmle/ServiceDirectory/ActiveNodes/member0000000026
> 0x2000001141a000f:
>  /moot/gmle/ServiceDirectory/ActiveNodes/member0000000066
> 0x200000130750001:
>  /moot/gmle/ServiceDirectory/ActiveNodes/member0000000025
> 0x2000001141a0001:
>  /moot/gmle/ServiceDirectory/ActiveNodes/member0000000065
> 0x2000001141a0000:
>  /moot/gmle/ActiveControllerCluster/member0000000065
> 0x2000001141a0005:
>  /moot/gmle/ActiveControllerCluster/member0000000066
> Connections dump:
> Connections Sets (4)/(2):
> 0 expire at Tue Sep 20 18:25:40 UTC 2016:
> 1 expire at Tue Sep 20 18:25:50 UTC 2016:
>  ip: /10.0.0.3:52784 sessionId: 0x0
> 0 expire at Tue Sep 20 18:26:10 UTC 2016:
> 1 expire at Tue Sep 20 18:26:20 UTC 2016:
>  ip: /10.0.0.3:50222 sessionId: 0x300000188c30001



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