azure - WCF SOAP Service don't return HTTP message body -


good day.

we have production deployment running wcf soap service under iis, azure, web roles.

we noticed of requests show strange behavior, can't explain nor understand.

it seems in cases request processed, http headers returned client, no message body not returned. after 120 seconds request start connection dropped.

the http headers include content-length seems right.

it seems 10% of requests behave way.

we tried reproduce in test, seems happens under high load.

we have tried streaming ad buffered transfermode , didn't see difference.

we have manually added wcf diagnostic traces 1 of servers. no errors recorded. message tracing shows none of request processed in more 18 seconds fine our system.

any appreciated.

br, hanan

as doubt performance or scalability issue. drill down, first confirm by

  1. retest scenarios light load make sure code , business functionality implemented right.

  2. once make sure system developed correctly, jump scalability testing give figures identify benchmarks , how system behaving during scaling process if such thing in place.

    doing scalability test increase load linearly , first figure out deployed system or environment capability (cpu/memory/network/io ...) , when scaling rule should applied. secondly when scaling up, need make requests , confirm scaling or down not effecting solution.

  3. if sure capacity of system enough load, drill down further see if there underlying db or sub system chocked up.

monitoring server perfmon tool metrics analysis give better picture understand capacity issues.

note - if able see consistent faulty behaviour responses irrespective of load , small manual request failing better in different approach rather doubting capacity.


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