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<div>It depends on the "corruption" that u are willing to tolerate. Sigterm means the process just terminates, what if said process was 3/4 through some operation (create_volume for example)??</div>
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<div>Personally I am willing to tolerate zero corruption, reliability and consistency are foundational things for me. Others may be more tolerant though, seems worth further discussion IMHO.<br>
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Sent from my really tiny device...</div>
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On Dec 15, 2013, at 8:39 PM, "iKhan" <<a href="mailto:ik.ibadkhan@gmail.com">ik.ibadkhan@gmail.com</a>> wrote:<br>
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<div dir="ltr">How about sending SIGTERM to child processes and then starting them? I know this is the hard way of achieving the objective and SIGHUP approach will handle it more gracefully. As you mentioned it is a major change, tentatively can we use SIGTERM
to achieve the objective?</div>
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<div class="gmail_quote">On Mon, Dec 16, 2013 at 9:50 AM, Joshua Harlow <span dir="ltr">
<<a href="mailto:harlowja@yahoo-inc.com" target="_blank">harlowja@yahoo-inc.com</a>></span> wrote:<br>
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<div>In your proposal does it means that the child process will be restarted (that means kill -9 or sigint??). If so, without taskflow to help (or other solution) that means operations in progress will be corrupted/lost. That seems bad...</div>
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<div>A SIGHUP approach could be handled more gracefully (but it does require some changes in the underlying codebase to do this "refresh").
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Sent from my really tiny device...</div>
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On Dec 15, 2013, at 3:11 AM, "iKhan" <<a href="mailto:ik.ibadkhan@gmail.com" target="_blank">ik.ibadkhan@gmail.com</a>> wrote:<br>
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<div dir="ltr">I don't know if this is being planned in Icehouse, if not probably proposing an approach will help. We have seen cinder-volume service initialization part. Similarly if we can get our hands on child process that are running under cinder-volume
service, if we terminate those process and restart them along with newly added backends. It might help us achieve the target.</div>
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<div class="gmail_quote">On Sun, Dec 15, 2013 at 12:49 PM, Joshua Harlow <span dir="ltr">
<<a href="mailto:harlowja@yahoo-inc.com" target="_blank">harlowja@yahoo-inc.com</a>></span> wrote:<br>
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<div>I don't currently know of a one size fits all solution here. There was talk at the summit of having the cinder app respond to a SIGHUP signal and attempting to reload config on this signal. Dynamic reloading is tricky business (basically u need to unravel
anything holding references to the old config values/affected by the old config values). </div>
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<div>I would start with a simple trial of this if u want to so it, part if the issue will likely be oslo.config (can that library understand dynamic reloading?) and then cinder drivers themselves (perhaps u need to create a registry of drivers that can dynamically
reload on config reloads?). Start out with something simple, isolate the reloading as much as u can to a single area (something like the mentioned registry of objects that can be reloaded when a SIGHUP arrives) and see how it goes.</div>
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<div>It does seem like a nice feature if u can get it right :-)<br>
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Sent from my really tiny device...</div>
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On Dec 13, 2013, at 8:57 PM, "iKhan" <<a href="mailto:ik.ibadkhan@gmail.com" target="_blank">ik.ibadkhan@gmail.com</a>> wrote:<br>
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<div style="font-family:arial,sans-serif;font-size:13px">Hi All,</div>
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<div style="font-family:arial,sans-serif;font-size:13px">At present cinder driver can be only configured with adding entries in conf file. Once these driver related entries are modified or added in conf file, we need to restart cinder-volume service to validate
the conf entries and create a child process that runs in background.</div>
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<div style="font-family:arial,sans-serif;font-size:13px">I am thinking of a way to re-initialize or dynamically configure cinder driver. So that I can accept the configuration from user on fly and perform operations. I think solution lies somewhere around "oslo.config.cfg",
but I am still unclear about how re-initializing can be achieved.</div>
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<div style="font-family:arial,sans-serif;font-size:13px">Let know if anyone here is aware of any approach to re-initialize or dynamically configure a driver.</div>
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<div><span></span>Thanks,</div>
<div>IK</div>
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<div><span></span>Thanks,</div>
<div>Ibad Khan</div>
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