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https://issues.apache.org/jira/browse/ZOOKEEPER-1751?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jeffrey Zhong updated ZOOKEEPER-1751:
-------------------------------------
Description:
We could throw SessionTimeoutException exception even when timeToNextPing may
also be negative depending on the time when the following line is executed by
the thread because we check time out before sending a ping.
{code}
to = readTimeout - clientCnxnSocket.getIdleRecv();
{code}
In addition, we only ping twice no matter how long the session time out value
is. For example, we set session time out = 60mins then we only try ping twice
in 40mins window. Therefore, the connection could be dropped by OS after idle
time out.
The issue is causing randomly "connection loss" or "session expired" issues in
client side which is bad for applications like HBase.
was:
We could throw SessionTimeoutException exception even when timeToNextPing may
also be negative depending on the time when the following line is executed by
the thread because we check time out before sending a ping.
{code}
to = readTimeout - clientCnxnSocket.getIdleRecv();
{code}
In addition, we only ping twice no matter how long the session time out value
is. For example, we set session time out = 60mins then we only try ping twice
in 40mins window. Therefore, the connection could be dropped by OS after idle
time out.
> ClientCnxn#run could miss the second ping or connection get dropped before a
> ping
> ---------------------------------------------------------------------------------
>
> Key: ZOOKEEPER-1751
> URL: https://issues.apache.org/jira/browse/ZOOKEEPER-1751
> Project: ZooKeeper
> Issue Type: Bug
> Affects Versions: 3.4.5
> Reporter: Jeffrey Zhong
> Assignee: Jeffrey Zhong
> Attachments: zookeeper-1751.patch
>
>
> We could throw SessionTimeoutException exception even when timeToNextPing may
> also be negative depending on the time when the following line is executed by
> the thread because we check time out before sending a ping.
> {code}
> to = readTimeout - clientCnxnSocket.getIdleRecv();
> {code}
> In addition, we only ping twice no matter how long the session time out value
> is. For example, we set session time out = 60mins then we only try ping twice
> in 40mins window. Therefore, the connection could be dropped by OS after idle
> time out.
> The issue is causing randomly "connection loss" or "session expired" issues
> in client side which is bad for applications like HBase.
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