Mailing-List: contact user-help@mesos.apache.org; run by ezmlm
Precedence: bulk
Reply-To: user@mesos.apache.org
MIME-Version: 1.0
In-Reply-To: <578C9C87.6040009@gmail.com>
References: <578C9C87.6040009@gmail.com>
From: Joseph Wu <joseph@mesosphere.io>
Date: Mon, 18 Jul 2016 11:17:51 -0700
Message-ID: <CAGxaGb1y3awVkMowtCgEa7tnTbYC9gW_q5ZHDwMNc4cVYOrfBQ@mail.gmail.com>
Subject: Re: What will happen in maintenance mode
To: user <user@mesos.apache.org>
Content-Type: multipart/alternative; boundary=047d7bfcff728ce3810537ecfcba
archived-at: Mon, 18 Jul 2016 18:18:06 -0000

--047d7bfcff728ce3810537ecfcba
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: quoted-printable

My guess is that your agents don't match the machines you specified.  Note:
The maintenance endpoints in Mesos allow you to specify maintenance against
non-existent machines, because the operator may add agents on those
machines in future.

In Mesos' maintenance primitives, a "machine" is a hostname + IP.  (A
physical/virtual machine can hold multiple agents.)  The response in
/maintenance/status is in terms of machines, not agents.  If none of your
frameworks support inverse offers, then you won't get any useful
information from the /maintenance/status endpoint.

You can figure out an agent's hostname/IP by hitting the /master/slaves
endpoint:

{
  "slaves": [
    {
      "pid":"slave(1)@127.0.0.1:5051",
      "hostname":"foo-bar",
      ...

^ The above translates to a machine =3D { "hostname": "foo-bar", "ip" : "
127.0.0.1" }

On Mon, Jul 18, 2016 at 2:08 AM, Qiang Chen <qzschen@gmail.com> wrote:

> Hi all,
>
> I'm puzzled in using maintenance mode.
>
> I see this from mesos [doc site](
> http://mesos.apache.org/documentation/latest/maintenance/):
>
> ```
> When maintenance is triggered by the operator, all agents on the machine
> are told to shutdown. These agents are removed from the master, which mea=
ns
> that a TASK_LOST status update will be sent for every task running on
> each of those agents. The scheduler driver=E2=80=99s slaveLost callback w=
ill also
> be invoked for each of the removed agents. Any agents on machines in
> maintenance are also prevented from re-registering with the master in the
> future (until maintenance is completed and the machine is brought back up=
).
> ```
> But I didn't find the agent machine shutdown or task failed when I test
> the maintenance HTTP endpoints.
>
> If mesos agents are in that mode will move the running tasks to other
> agents? namely, it will evacuate all the tasks in those agents? and the
> shutdown?
>
> When I POST "/maintenance/schedule" and "/machine/down" and give a proper
> maintain time window. I got the response that those specified agents are =
in
> the "draining_machines" and "down_machines" list by GET
> "/maintenance/status", but didn't shutdown and evacuate any tasks, why ?
> does it make sense?
>
> Thanks.
>
> --
> Best Regards,
> Chen, Qiang
>
>

--047d7bfcff728ce3810537ecfcba
Content-Type: text/html; charset=UTF-8
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr">My guess is that your agents don&#39;t match the machines =
you specified.=C2=A0 Note: The maintenance endpoints in Mesos allow you to =
specify maintenance against non-existent machines, because the operator may=
 add agents on those machines in future.<br><div><br>In Mesos&#39; maintena=
nce primitives, a &quot;machine&quot; is a hostname + IP.=C2=A0 (A physical=
/virtual machine can hold multiple agents.)=C2=A0 The response in /maintena=
nce/status is in terms of machines, not agents.=C2=A0 If none of your frame=
works support inverse offers, then you won&#39;t get any useful information=
 from the /maintenance/status endpoint.<br><br></div>You can figure out an =
agent&#39;s hostname/IP by hitting the /master/slaves endpoint:<br><div><pr=
e>{<br>  &quot;slaves&quot;: [<br>    {<br>      &quot;pid&quot;:&quot;slav=
e(1)@<a href=3D"http://127.0.0.1:5051">127.0.0.1:5051</a>&quot;,<br>      &=
quot;hostname&quot;:&quot;foo-bar&quot;,<br>      ...<br></pre>^ The above =
translates to a machine =3D { &quot;hostname&quot;: &quot;foo-bar&quot;, &q=
uot;ip&quot; : &quot; 127.0.0.1&quot; }<br></div></div><div class=3D"gmail_=
extra"><br><div class=3D"gmail_quote">On Mon, Jul 18, 2016 at 2:08 AM, Qian=
g Chen <span dir=3D"ltr">&lt;<a href=3D"mailto:qzschen@gmail.com" target=3D=
"_blank">qzschen@gmail.com</a>&gt;</span> wrote:<br><blockquote class=3D"gm=
ail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-le=
ft:1ex">
 =20

   =20
 =20
  <div text=3D"#000000" bgcolor=3D"#FFFFFF">
    Hi all,<br>
    <br>
    I&#39;m puzzled in using maintenance mode. <br>
    <br>
    I see this from mesos [doc
    site](<a href=3D"http://mesos.apache.org/documentation/latest/maintenan=
ce/" target=3D"_blank">http://mesos.apache.org/documentation/latest/mainten=
ance/</a>):<br>
    <br>
    ```<br>
    When maintenance is triggered by the operator, all agents on the
    machine are
    told to shutdown. These agents are removed from the master, which
    means that a
    <code>TASK_LOST</code> status update will be sent for every task
    running on each of those
    agents. The scheduler driver=E2=80=99s <code>slaveLost</code> callback =
will
    also be invoked for
    each of the removed agents. Any agents on machines in maintenance
    are also
    prevented from re-registering with the master in the future (until
    maintenance
    is completed and the machine is brought back up).<br>
    ```<br>
    But I didn&#39;t find the agent machine shutdown or task failed when I
    test the maintenance HTTP endpoints.<br>
    <br>
    If mesos agents are in that mode will move the running tasks to
    other agents? namely, it will evacuate all the tasks in those
    agents? and the shutdown?<br>
    <br>
    When I POST &quot;/maintenance/schedule&quot; and &quot;/machine/down&q=
uot; and give a
    proper maintain time window. I got the response that those specified
    agents are in the &quot;draining_machines&quot; and &quot;down_machines=
&quot; list by
    GET &quot;/maintenance/status&quot;, but didn&#39;t shutdown and evacua=
te any
    tasks, why ? does it make sense?<br>
    <br>
    Thanks.<span class=3D"HOEnZb"><font color=3D"#888888"><br>
    <br>
    <pre cols=3D"72">--=20
Best Regards,
Chen, Qiang</pre>
  </font></span></div>

</blockquote></div><br></div>

--047d7bfcff728ce3810537ecfcba--