On Friday, September 2, 2016 at 10:43:50 AM UTC-7, Trevor Turk wrote:
>
> Hello -- just reporting back on my progress so far.
>
> It appears we can use paged_each safely, however I was surprised to find
> that we can't run two simultaneously if they issue updates in the block.
>
In general it's not safe to issue queries inside a Dataset#each (and
#paged_each) block, unless you force the use of a different connection.
Whether it works depends on the adapter, but it's always unsupported.
To work around this issue, you can use sharding (Dataset option like
:servers=>{:foo=>{}}), and do dataset.server(:foo).paged_each.
Alternatively, you can issue queries in a separate thread inside the
Dataset#each block. Even something simple like
dataset.each{Thread.new{...}.join} should work. Please try one of those
options and report back.
Thanks,
Jeremy
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