Timezone Requirements?

[Albert Law]

Hi All,

Does Hydra want the system to be in UTC? Alternatively, does Hydra
every change the timezone to UTC?


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Albert Law
Lead Engineer - Data Acquisition
NewBrand
http://www.newbrandanalytics.com/

[Michael Spiegel]

Hydra jobs are agnostic to the format of time when they are processing bundles. Take a look at http://oss-docs.clearspring.com/hydra/latest/user-reference/com/addthis/hydra/data/filter/bundle/BundleFilterTime.html and http://oss-docs.clearspring.com/hydra/latest/user-reference/com/addthis/hydra/data/util/TimeField.html.

date +%Z shows that our clusters on the east coast and west coast are both set to "EST" time zone. I really hope we don't have some kind of latent dependency that requires the hydra processes to be running in that time zone. That would be terrible.

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[Chris Burroughs]

Hydra relies on System.currentTimeMillis being correct, that is
returning millisecond since January 1, 1970 UTC. On linux it's typical
for the system clock to be set to UTC and then a local timezone is
configured to be whatever users want for display purposes. In other
words `date +%s` must return the correct UTC time but `date` can return
whatever humans like. This is likely already the case on almost any
Linux system.

A long time ago AddThis had some log files that logged in local time
with no timezone info (oops!) which complicated a bunch of things but I
don't think think any of that cruft is left at this point. As Michael
said the Joda Time wrapping Bundles should just do the Right Thing.