There are no "idle" instances, and one of the reasons is precisely what we speak of: possible initialization issues. Instances are either wholly new and spun up to secure scalability, or totally destroyed, in other words either alive or dead, nothing in-between.
On 8 June 2017 at 02:53, Joshua Fox <[email protected]> wrote: > The concept "Idle Resident instance" might be relevant here. > > Are instances switched from active to idle to active -- not actually > stopping the JVM on switch to idle, and invoking *contextInitialized *on > switch to active? > > > On Wed, Jun 7, 2017 at 6:17 PM, Joshua Fox <[email protected]> wrote: > >> >> >> On Wed, Jun 7, 2017 at 6:01 PM, 'George (Cloud Platform Support)' via >> Google App Engine <[email protected]> wrote: >> >>> Hello Joshua, >>> >>> This is potentially a quite interesting issue. Which global variables or >>> static fields do you intend to set? >>> >> Just some static variables which are set from Datastore to reflect some >> global project-level state. Actually, it's a Singleton. >> >> >>> How were these sometimes already set? >>> >> >> Some code detects if the variable is nonnull and balks,and prints a log. >> >> Some examples and relevant detail would come handy. In fact, >>> the contextInitialized method receives notification that the web >>> application initialization process is starting; this is the general >>> description. >>> >> >> Right -- but is *contextInitialized* called only once per JVM >> initialization? Or do "resident instances >> <https://cloud.google.com/appengine/docs/standard/java/how-instances-are-managed>" >> get "put to sleep" and then awakened by calling *contextInitialized?* >> >> What detail can I provide? The following should be a good summary: In >> *contextInitialized *, we set a static field of the class to nonnull. At >> the point right before it is set, it should always be null. >> >>> -- >>> You received this message because you are subscribed to the Google >>> Groups "Google App Engine" group. >>> To unsubscribe from this group and stop receiving emails from it, send >>> an email to [email protected]. >>> To post to this group, send email to [email protected]. >>> Visit this group at https://groups.google.com/group/google-appengine. >>> To view this discussion on the web visit https://groups.google.com/d/ms >>> gid/google-appengine/3d76f372-6d20-48a8-bf3f-22b101a08f98%40 >>> googlegroups.com >>> <https://groups.google.com/d/msgid/google-appengine/3d76f372-6d20-48a8-bf3f-22b101a08f98%40googlegroups.com?utm_medium=email&utm_source=footer> >>> . >>> For more options, visit https://groups.google.com/d/optout. >>> >> >> >> >> -- >> *JOSHUA FOX* >> Principal Software Architect | Freightos >> >> >> ☏* (Israel): *+972-545691165 <+972%2054-569-1165> | ☏* (US)*: + >> 1-3123400953 <(312)%20340-0953>* | Skype*: joshuafox.freightos >> Smoother shipping with the world's online freight marketplace. >> Online Marketplace >> <https://www.google.com/url?q=https%3A%2F%2Fwww.freightos.com%2Fcompare-book-manage-freight-quotes%2F&sa=D&sntz=1&usg=AFrqEzfMkBQBWsovNlg47sIDORa5FpHDkQ> >> / In the News >> <https://www.google.com/url?q=https%3A%2F%2Fwww.freightos.com%2Fabout-us%2Fin-the-news%2F&sa=D&sntz=1&usg=AFrqEzexnYSKKYuEW4zuC-QrR4X8G53w6Q> >> / Freightos Blog >> <http://www.google.com/url?q=http%3A%2F%2Ffreightos.com%2Fresources%2Ffreightos-blog%2F&sa=D&sntz=1&usg=AFrqEzczY9ZxESxvh7ITnd_Al01Xyp4gdA> >> >> > > > -- > *JOSHUA FOX* > Principal Software Architect | Freightos > > > ☏* (Israel): *+972-545691165 <+972%2054-569-1165> | ☏* (US)*: + > 1-3123400953 <(312)%20340-0953>* | Skype*: joshuafox.freightos > Smoother shipping with the world's online freight marketplace. > Online Marketplace > <https://www.google.com/url?q=https%3A%2F%2Fwww.freightos.com%2Fcompare-book-manage-freight-quotes%2F&sa=D&sntz=1&usg=AFrqEzfMkBQBWsovNlg47sIDORa5FpHDkQ> > / In the News > <https://www.google.com/url?q=https%3A%2F%2Fwww.freightos.com%2Fabout-us%2Fin-the-news%2F&sa=D&sntz=1&usg=AFrqEzexnYSKKYuEW4zuC-QrR4X8G53w6Q> > / Freightos Blog > <http://www.google.com/url?q=http%3A%2F%2Ffreightos.com%2Fresources%2Ffreightos-blog%2F&sa=D&sntz=1&usg=AFrqEzczY9ZxESxvh7ITnd_Al01Xyp4gdA> > > -- > You received this message because you are subscribed to a topic in the > Google Groups "Google App Engine" group. > To unsubscribe from this topic, visit https://groups.google.com/d/ > topic/google-appengine/Zy6xZioG6UQ/unsubscribe. > To unsubscribe from this group and all its topics, send an email to > [email protected]. > To post to this group, send email to [email protected]. > Visit this group at https://groups.google.com/group/google-appengine. > To view this discussion on the web visit https://groups.google.com/d/ > msgid/google-appengine/CAD%3DB7cNzbpbkgwO%3DUw% > 2Bz4FShfu9YkNj6jUnv16ZpMgeRmcko9w%40mail.gmail.com > <https://groups.google.com/d/msgid/google-appengine/CAD%3DB7cNzbpbkgwO%3DUw%2Bz4FShfu9YkNj6jUnv16ZpMgeRmcko9w%40mail.gmail.com?utm_medium=email&utm_source=footer> > . > > For more options, visit https://groups.google.com/d/optout. > -- You received this message because you are subscribed to the Google Groups "Google App Engine" group. 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