[lug] Docker

[Stephen Kraus]

It can take up to 24 minutes for a decent size hadoop cluster to fully
initialize.

On Tue, Jul 24, 2018 at 1:20 PM Bear Giles <bgiles at coyotesong.com> wrote:

> ​The image starts quickly, it's the services on the image that may take a
> while to come up. Single node Hadoop clusters may take several minutes to
> fully launch.​ Ditto appservers (jboss, tomcat) with a fair number of
> webapps. The parameter is tunable but 60s is the default.
>
> If you're launching a webservice there's an alternative - the library can
> hit a REST call wait for it to come up instead of waiting a blind amount of
> time. If it becomes a problem we can probably fork the library and do
> something similar with other services, e.g., not return until the library
> can establish a JDBC connection instead of waiting for a fixed amount of
> time.
>
> On Tue, Jul 24, 2018 at 10:24 AM, Zan Lynx <zlynx at acm.org> wrote:
>
>> On 07/24/2018 06:37 AM, Bear Giles wrote:
>> > Maintaining a docker image is much more manageable. Unfortunately
>> > there's nearly always a 60s delay to allow time for the server to come
>> > up. We need to look into modifying our tests so they can run in
>> parallel.)
>>
>> There's something very wrong in your Docker storage setup. You need to
>> be using aufs or btrfs. Some filesystem that does overlays or snapshots.
>> 60s sounds like it's doing file copies.
>>
>> We do a lot of Docker where I work and starting a docker container
>> that's already downloaded is *instant*. No noticeable delay at all.
>>
>> --
>>                 Knowledge is Power -- Power Corrupts
>>                         Study Hard -- Be Evil
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>
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