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https://issues.apache.org/jira/browse/MESOS-5361?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Anand Mazumdar updated MESOS-5361:
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Description:
We currently don't use TCP KeepAlive's when creating sockets in libprocess.
This might benefit master - scheduler, master - agent connections i.e. we can
detect if any of them failed faster.
Currently, if the master process goes down. If for some reason the {{RST}}
sequence did not reach the scheduler, the scheduler can only come to know about
the disconnection when it tries to do a {{send}} itself.
The default TCP keep alive values on Linux are a joke though:
{code}
. This means that the keepalive routines wait for two hours (7200 secs) before
sending the first keepalive probe, and then resend it every 75 seconds. If no
ACK response is received for nine consecutive times, the connection is marked
as broken.
{code}
However, for long running instances of scheduler/agent this still can be
beneficial. Also, operators might start tuning the values for their clusters
explicitly once we start supporting it.
was:
We currently don't use TCP KeepAlive's when creating sockets in libprocess.
This might benefit master <-> scheduler, master <-> agent connections i.e. we
can detect if any of them failed faster.
Currently, if the master process goes down. If for some reason the {{RST}}
sequence did not reach the scheduler, the scheduler can only come to know about
the disconnection when it tries to do a {{send}} itself.
The default TCP keep alive values on Linux are a joke though:
{code}
. This means that the keepalive routines wait for two hours (7200 secs) before
sending the first keepalive probe, and then resend it every 75 seconds. If no
ACK response is received for nine consecutive times, the connection is marked
as broken.
{code}
However, for long running instances of scheduler/agent this still can be
beneficial. Also, operators might start tuning the values for their clusters
explicitly once we start supporting it.
> Consider introducing TCP KeepAlive for Libprocess sockets.
> ----------------------------------------------------------
>
> Key: MESOS-5361
> URL: https://issues.apache.org/jira/browse/MESOS-5361
> Project: Mesos
> Issue Type: Improvement
> Components: libprocess
> Reporter: Anand Mazumdar
> Labels: mesosphere
>
> We currently don't use TCP KeepAlive's when creating sockets in libprocess.
> This might benefit master - scheduler, master - agent connections i.e. we can
> detect if any of them failed faster.
> Currently, if the master process goes down. If for some reason the {{RST}}
> sequence did not reach the scheduler, the scheduler can only come to know
> about the disconnection when it tries to do a {{send}} itself.
> The default TCP keep alive values on Linux are a joke though:
> {code}
> . This means that the keepalive routines wait for two hours (7200 secs)
> before sending the first keepalive probe, and then resend it every 75
> seconds. If no ACK response is received for nine consecutive times, the
> connection is marked as broken.
> {code}
> However, for long running instances of scheduler/agent this still can be
> beneficial. Also, operators might start tuning the values for their clusters
> explicitly once we start supporting it.
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