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https://issues.apache.org/jira/browse/CONNECTORS-1031?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14135366#comment-14135366
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Karl Wright commented on CONNECTORS-1031:
-----------------------------------------
The stack trace from agents when Zookeeper is in this state is identical to
that which Erlend has reported.
The reasons for the connections going down seem specifically to be due to
general latency of some form or another:
https://github.com/pongasoft/glu/issues/189
It is possible that we could prevent this from happening as often with certain
specific changes; e.g. a longer tick count or timeout. However, the logs also
contain the following:
{code}
[NIOServerCxn.Factory:0.0.0.0/0.0.0.0:8349] INFO
org.apache.zookeeper.server.NIOServerCnxnFactory - Accepted socket connection
from /0:0:0:0:0:0:0:1:59735
[NIOServerCxn.Factory:0.0.0.0/0.0.0.0:8349] INFO
org.apache.zookeeper.server.ZooKeeperServer - Client attempting to renew
session 0x1487e42da2d0008 at /0:0:0:0:0:0:0:1:59735
[NIOServerCxn.Factory:0.0.0.0/0.0.0.0:8349] INFO
org.apache.zookeeper.server.ZooKeeperServer - Established session
0x1487e42da2d0008 with negotiated timeout 4000 for client /0:0:0:0:0:0:0:1:59735
[NIOServerCxn.Factory:0.0.0.0/0.0.0.0:8349] INFO
org.apache.zookeeper.server.NIOServerCnxnFactory - Accepted socket connection
from /127.0.0.1:59736
[NIOServerCxn.Factory:0.0.0.0/0.0.0.0:8349] INFO
org.apache.zookeeper.server.ZooKeeperServer - Client attempting to renew
session 0x1487e42da2d0020 at /127.0.0.1:59736
[NIOServerCxn.Factory:0.0.0.0/0.0.0.0:8349] INFO
org.apache.zookeeper.server.ZooKeeperServer - Established session
0x1487e42da2d0020 with negotiated timeout 4000 for client /127.0.0.1:59736
[NIOServerCxn.Factory:0.0.0.0/0.0.0.0:8349] INFO
org.apache.zookeeper.server.NIOServerCnxnFactory - Accepted socket connection
from /127.0.0.1:59737
[NIOServerCxn.Factory:0.0.0.0/0.0.0.0:8349] INFO
org.apache.zookeeper.server.ZooKeeperServer - Client attempting to renew
session 0x1487e42da2d0006 at /127.0.0.1:59737
[NIOServerCxn.Factory:0.0.0.0/0.0.0.0:8349] INFO
org.apache.zookeeper.server.ZooKeeperServer - Established session
0x1487e42da2d0006 with negotiated timeout 4000 for client /127.0.0.1:59737
[NIOServerCxn.Factory:0.0.0.0/0.0.0.0:8349] INFO
org.apache.zookeeper.server.NIOServerCnxnFactory - Accepted socket connection
from /127.0.0.1:59738
[NIOServerCxn.Factory:0.0.0.0/0.0.0.0:8349] INFO
org.apache.zookeeper.server.ZooKeeperServer - Client attempting to renew
session 0x1487e42da2d004c at /127.0.0.1:59738
[NIOServerCxn.Factory:0.0.0.0/0.0.0.0:8349] INFO
org.apache.zookeeper.server.ZooKeeperServer - Established session
0x1487e42da2d004c with negotiated timeout 4000 for client /127.0.0.1:59738
[NIOServerCxn.Factory:0.0.0.0/0.0.0.0:8349] INFO
org.apache.zookeeper.server.NIOServerCnxnFactory - Accepted socket connection
from /127.0.0.1:59739
[NIOServerCxn.Factory:0.0.0.0/0.0.0.0:8349] INFO
org.apache.zookeeper.server.ZooKeeperServer - Client attempting to renew
session 0x1487e42da2d0005 at /127.0.0.1:59739
[NIOServerCxn.Factory:0.0.0.0/0.0.0.0:8349] INFO
org.apache.zookeeper.server.ZooKeeperServer - Established session
0x1487e42da2d0005 with negotiated timeout 4000 for client /127.0.0.1:59739
{code}
This indicates to me that connections are getting re-established, but the
subsequent hangs seem to indicate that connection re-establishment is not
enough to reset things completely.
> Update zookeeper parameters so that example server is stable for the long term
> ------------------------------------------------------------------------------
>
> Key: CONNECTORS-1031
> URL: https://issues.apache.org/jira/browse/CONNECTORS-1031
> Project: ManifoldCF
> Issue Type: Bug
> Components: Framework core
> Affects Versions: ManifoldCF 1.7
> Reporter: Karl Wright
> Assignee: Karl Wright
> Fix For: ManifoldCF 2.0
>
>
> The zookeeper parameters we deliver are missing apparently important limits
> on growth:
> autopurge.snapRetainCount=3 : default value
> autopurge.purgeInterval=1: default value
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