I/O worker and ConfigReload

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От Dmitry Dolgov
Тема I/O worker and ConfigReload
Дата
Msg-id sh5uqe4a4aqo5zkkpfy5fobe2rg2zzouctdjz7kou4t74c66ql@yzpkxb7pgoxf
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Hi,

I've been rebasing the patch for online resizing of shared memory, and
noticed something strange about IoWorkerMain: although it sets the
handler SignalHandlerForConfigReload, it doesn't look like it acts upon
ConfigReloadPending. From what I see it happens because it only does
CHECK_FOR_INTERRUPTS in the main worker loop, which doesn't handle
ConfigReloadPending.

In the context of shared memory resizing patch it means I/O workers are
not receiving the new value of NBuffers and crash. Adding something like
pgaio_worker_process_interrupts to deal with ConfigReloadPending at the
beginning of the main worker loop seems to solve the issue. But I
haven't found any discussion about config reload in I/O workers, was
this omission intentional?



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