Memcache Exception (Java GAE Standard Environment)

[Sourav Chandra]

Hi,

We are using java based gae standard environment. Today we have received sudden surge of below memcache errors and subsequent appengine log

Memcache Error Message:

com.google.appengine.api.memcache.MemcacheServiceException: Memcache put: Error setting single item (...)

Subsequent Message:

After handling this request, the process that handled this request was found to have handled too many sequential errors, and was terminated. This is likely to cause a new process to be used for the next request to your application. If you see this message frequently, you are likely returning errors continously from your application.

Could any of you let me know what could the reason? Also when does appengine emit the message?

Thanks,

Sourav

[Sourav Chandra]

Full Stacktrace:

Caused by: com.google.appengine.api.memcache.MemcacheServiceException: Memcache put: Error setting single item (...) at com.google.appengine.api.memcache.AsyncMemcacheServiceImpl$7.transform(AsyncMemcacheServiceImpl.java:557) at com.google.appengine.api.memcache.AsyncMemcacheServiceImpl$7.transform(AsyncMemcacheServiceImpl.java:544) at com.google.appengine.api.memcache.MemcacheServiceApiHelper$RpcResponseHandler.convertResponse(MemcacheServiceApiHelper.java:58) at com.google.appengine.api.memcache.MemcacheServiceApiHelper$1.wrap(MemcacheServiceApiHelper.java:103) at com.google.appengine.api.memcache.MemcacheServiceApiHelper$1.wrap(MemcacheServiceApiHelper.java:98) at com.google.appengine.api.utils.FutureWrapper.wrapAndCache(FutureWrapper.java:56) at com.google.appengine.api.utils.FutureWrapper.get(FutureWrapper.java:93) at com.google.appengine.api.utils.FutureWrapper.get(FutureWrapper.java:89) at com.google.appengine.api.memcache.MemcacheServiceImpl.quietGet(MemcacheServiceImpl.java:26) at com.google.appengine.api.memcache.MemcacheServiceImpl.put(MemcacheServiceImpl.java:74) at com.livestream.donations.utils.MemCacheUtils.put(MemCacheUtils.java:72) at com.livestream.donations.utils.LsApiUtils.getStripeDetailsFor(LsApiUtils.java:39) at com.livestream.donations.utils.LsApiUtils.getStripeIdFor(LsApiUtils.java:53) at com.livestream.donations.utils.LsApiUtils$2.call(LsApiUtils.java:66) at com.livestream.donations.utils.LsApiUtils$2.call(LsApiUtils.java:63) at java.util.concurrent.FutureTask.run(FutureTask.java:260) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1168) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:605)

Note: The object I am storing in the memcache key has only 2 String fields

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Sourav Chandra Senior Software Engineer · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·

sourav....@livestream.com o: +91 80 4121 8723 m: +91 988 699 3746 skype: sourav.chandra Livestream "Ajmera Summit", First Floor, #3/D, 68 Ward, 3rd Cross, 7th C Main, 3rd Block, Koramangala Industrial Area, Bangalore 560034 www.livestream.com

[Nick (Cloud Platform Support)]

Hey Sourav,

This was likely caused by too many uncaught errors causing requests to fail. You should wrap the code performing memcache.put() calls in a try-catch block so you can retry the memcache.put() using an exponential back-off scheme.

Let me know if you have any comments or questions and I'll be happy to assist!

Cheers,

Nick
Cloud Platform Community Support 

On Sunday, September 25, 2016 at 9:03:50 AM UTC-4, Sourav Chandra wrote:

Full Stacktrace:

Caused by: com.google.appengine.api.memcache.MemcacheServiceException: Memcache put: Error setting single item (...) at com.google.appengine.api.memcache.AsyncMemcacheServiceImpl$7.transform(AsyncMemcacheServiceImpl.java:557) at com.google.appengine.api.memcache.AsyncMemcacheServiceImpl$7.transform(AsyncMemcacheServiceImpl.java:544) at com.google.appengine.api.memcache.MemcacheServiceApiHelper$RpcResponseHandler.convertResponse(MemcacheServiceApiHelper.java:58) at com.google.appengine.api.memcache.MemcacheServiceApiHelper$1.wrap(MemcacheServiceApiHelper.java:103) at com.google.appengine.api.memcache.MemcacheServiceApiHelper$1.wrap(MemcacheServiceApiHelper.java:98) at com.google.appengine.api.utils.FutureWrapper.wrapAndCache(FutureWrapper.java:56) at com.google.appengine.api.utils.FutureWrapper.get(FutureWrapper.java:93) at com.google.appengine.api.utils.FutureWrapper.get(FutureWrapper.java:89) at com.google.appengine.api.memcache.MemcacheServiceImpl.quietGet(MemcacheServiceImpl.java:26) at com.google.appengine.api.memcache.MemcacheServiceImpl.put(MemcacheServiceImpl.java:74) at com.livestream.donations.utils.MemCacheUtils.put(MemCacheUtils.java:72) at com.livestream.donations.utils.LsApiUtils.getStripeDetailsFor(LsApiUtils.java:39) at com.livestream.donations.utils.LsApiUtils.getStripeIdFor(LsApiUtils.java:53) at com.livestream.donations.utils.LsApiUtils$2.call(LsApiUtils.java:66) at com.livestream.donations.utils.LsApiUtils$2.call(LsApiUtils.java:63) at java.util.concurrent.FutureTask.run(FutureTask.java:260) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1168) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:605)

Note: The object I am storing in the memcache key has only 2 String fields