Google storage: allow optional use of thread pool #2
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If `use_threads=True` for the Google storage initialization, a thread pool will be used rather than a process pool for fetching data. This is needed in some use cases, for instance if the google storage should be used from within a Celery task.
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Hi Tom. I'm embarrassed to say that I totally missed this pull request. I have since made substantial changes to fafbseg - including some re-organizing of modules and switching all segmentation queries to the service on |
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If
use_threads=Truefor the Google storage initialization, a thread pool will be used rather than a process pool for fetching data. This is needed in some use cases, for instance if the google storage should be used from within a Celery task. Without this, an error is raised when starting workers from the process pool:AssertionError: daemonic processes are not allowed to have children.This in turn is needed in catmaid/circuitmap, where we use
fafbsegto request fragment IDs for locations from a Celery task.There might be more elegant ways to this (e.g. without modifying the parameters of
_get_seg_ids_gs()), but this seemed minimally invasive, given that this might be a special case. Happy to change it though.