Re: Might in some conditions EOUtilities.objectWithPrimaryKeyValue lock the application?
Re: Might in some conditions EOUtilities.objectWithPrimaryKeyValue lock the application?
- Subject: Re: Might in some conditions EOUtilities.objectWithPrimaryKeyValue lock the application?
- From: Ramsey Gurley <email@hidden>
- Date: Tue, 27 Jan 2015 14:41:46 -0700
If the instance is hung, I’d start with
jstack -F <pid>
That should give a stack trace on whatever deadlocked it.
On Jan 27, 2015, at 2:33 PM, OC <email@hidden> wrote:
> Hello there,
>
> another weird case: this application is run single-instance (but ERXObjectStoreCoordinatorPool.maxCoordinators=3, WOAllowsConcurrentRequestHandling=true).
>
> Yesterday after 14:10 users reported “No instance” or “Application not found” WO reports. Now, I log all R/R loops in Application.awake and Application.sleep; indeed at 14:10 a R/R loop did start and never ended, actually, almost nothing happened till the app was restarted by the administrator at 14:20. (I am told JavaMonitor has not been able to stop the instance normally, and it had to be killed/force quit.)
>
> The single thing which did happen looks like this in my log:
>
> ===
> //////////////////////////////////////////////////////////////////////////////////////////
> ////// R/R loop #2218 WorkerThread118 started at 14:10:05 26.1.
> //////////////////////////////////////////////////////////////////////////////////////////
> DA: reading CZ banner image for market 1000001...
> 14:20:39.844 WARN Force Quit received. Exiting now... //log:NSLog [Thread-3]
> APPLICATION SHUTDOWN SEQUENCE COMPLETE
> ===
>
> The “reading banner“ log comes from a direct action:
>
> ===
> WOActionResults bannerAction {
> def mpk=request().formValueForKey('mkpk'),lang=request().formValueForKey('lang')
> println "DA: reading $lang banner image for market $mpk..."
> if (!mpk || !lang) return null
> ERXEC ec=ERXEC.newEditingContext()
> DBMarket market=EOUtilities.objectWithPrimaryKeyValue(ec,'DBMarket',mpk as Integer)
> println "DA: ... $market" //*
> if (!market) return null
> def mime=market."marketBannerMIME$lang",data=market."marketBannerData$lang"
> println "DA: ... mime '$mime' data $data.length B"
> WOResponse wor=new WOResponse()
> wor.setHeader(mime,"content-type")
> ...
> wor.setContent(data)
> wor
> }
> ===
>
> Note the //* log is not present, which suggests that EOUtilities.objectWithPrimaryKeyValue did lock somehow?!? Neither any other R/R loop starts, which looks like not only WorkerThread118 did block, but that the instance stopped accepting requests at all.
>
> The FrontBase log (which I regret to say I do not fully understand, namely, those “--N lines, of which I get just the timestamp”) looks like this:
>
> ===
> ...
> --6 0x1039f41d8 0x1039f44b0 2015-01-26 14:10:05.53996 "1 0"
> --D 0x1039f41d8 0x1039f44b0 2015-01-26 14:10:05.55851 752 48429
> SELECT t0."C_AUCTION_AMOUNT_STEP", t0."C_AUCTION_AOFFALL", t0."C_AUCTION_MAX_AMOUNT", t0."C_MAX_LENGHT", t0."C_AUCTION_MIN_AMOUNT", t0."C_AUCTION_CHDELAY", t0."C_MIN_LENGTH", t0."C_AUCTION_MINSTART", t0."C_AUCTION_NEXT_SEQ", t0."C_AUCTION_CONCUR", t0."C_CREATION_DATE", t0."C_CREATOR_ID", t0."C_FIELD_IDENTIFIERS_FOR_EDITOR", t0."C_FIELD_IDENTIFIERS_FOR_FILTER", t0."C_FIELD_IDENTIFIERS_FOR_LIST", t0."C_FIELD_IDENTIFIERS_FOR_OFFER", t0."C_FIELD_IDENTIFIERS_FOR_PUBLIC", t0."C_FORM_TEMPLATE_ID", t0."C_MARKET_BANNER_CZ_DATA", t0."C_MARKET_BANNER_EN_DATA", t0."C_MARKET_BANNER_CZ_MIME", t0."C_MARKET_BANNER_EN_MIME", t0."C_SUPPORTS_OFFERS", t0."C_SHORTCUT", t0."C_TITLE", t0."C_UID", t0."C_WIDTHS_FOR_LIST" FROM "T_MARKET" t0 WHERE t0."C_UID" = 1000001;
> --6 0x1039f41d8 0x1039f44b0 2015-01-26 14:10:05.55903 "1 0"
> --7 0x1039f41d8 0x1039f44b0 2015-01-26 14:10:05.55905 ""
> --8 0x1039f41d8 0x1039f44b0 2015-01-26 14:10:05.55907 "1"
> --2 0x1039f41d8 0x1039f44b0 2015-01-26 14:10:05.55976 7 48430
> commit;
> --6 0x1039f41d8 0x1039f44b0 2015-01-26 14:10:05.55984 "1 0"
> --3 0x1040841d8 0x1040844b0 2015-01-26 14:20:40.50016
> ...
> ===
>
> If anybody can see what on earth might have happened, I'd be grateful for any advice. Myself, I just can see the app locked _somehow_ and stopped working at all, but have no idea why and how to prevent that...
>
> Note: the direct action worked flawlessly (and is in the logs) in the same instance each previous R/R loop, more than 2000 times.
>
> Thanks,
> OC
>
>
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