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https://issues.apache.org/jira/browse/IGNITE-9683?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16627284#comment-16627284
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Andrey Kuznetsov edited comment on IGNITE-9683 at 9/25/18 12:51 PM:
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[~Jokser], Zookeeper docs [1] mention ping requests built into Zk client:
"The session is kept alive by requests sent by the client. If the session is
idle for a period of time that would timeout the session, the client will send
a PING request to keep the session alive. This PING request not only allows the
ZooKeeper server to know that the client is still active, but it also allows
the client to verify that its connection to the ZooKeeper server is still
active. The timing of the PING is conservative enough to ensure reasonable time
to detect a dead connection and reconnect to a new server."
Is this statement outdated, or "reasonable time" is not suitable for Discovery
SPI?
[1] https://zookeeper.apache.org/doc/r3.4.13/zookeeperProgrammers.html
was (Author: andrey-kuznetsov):
[~Jokser], Zookeeper docs [1] mention ping requests built into Zk client:
"The session is kept alive by requests sent by the client. If the session is
idle for a period of time that would timeout the session, the client will send
a PING request to keep the session alive. This PING request not only allows the
ZooKeeper server to know that the client is still active, but it also allows
the client to verify that its connection to the ZooKeeper server is still
active. The timing of the PING is conservative enough to ensure reasonable time
to detect a dead connection and reconnect to a new server."
Is this statement outdated, or "reasonable time" is not suitable for Discovery
SPI?
> Create manual pinger for ZK client
> ----------------------------------
>
> Key: IGNITE-9683
> URL: https://issues.apache.org/jira/browse/IGNITE-9683
> Project: Ignite
> Issue Type: Improvement
> Components: cache, zookeeper
> Affects Versions: 2.5
> Reporter: Pavel Kovalenko
> Priority: Major
> Fix For: 2.7
>
>
> Connection loss with Zookeeper more than ZK session timeout for server nodes
> is unacceptable. To improve durability of connrction, we need to keep session
> with ZK as long possible. We need to introduce manual pinger additionally to
> ZK client and ping ZK server with simple request each tick time.
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