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Commit596a7c8
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Increase MAX_SYSCACHE_CALLBACKS to provide more room for extensions.
Increase from the historical value of 32 to 64. We are up to 31 callersof CacheRegisterSyscacheCallback() in HEAD, so if they were all to beexercised in one process that would leave only one slot for add-on modules.It's probably not possible for that to happen, but still we clearly needmore daylight here. (At some point it might be worth making the arraydynamically resizable; but since we've never heard a complaint of "out ofsyscache_callback_list slots" happening in the field, I doubt it's worthit yet.)Back-patch as far as 9.4, which is where we increased the companion limitMAX_RELCACHE_CALLBACKS (cf commitf01d1ae). It's not as urgent inreleased branches, which have only a couple dozen call sites in core, butit still seems that somebody might hit the limit before these branches die.Discussion:https://postgr.es/m/12184.1494450131@sss.pgh.pa.us1 parentd10c626 commit596a7c8
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