Missed some more errors:
Caused by: java.io.InvalidClassException: com.WikiHop.jdo.Pi; local
class incompatible: stream classdesc serialVersionUID =
-6007756724690804603, local class serialVersionUID = -1398789866
at java.io.ObjectStreamClass.initNonProxy(ObjectStreamClass.java:579)
at java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:
1600)
at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:
1513)
at
java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:
1749)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1346)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:368)
at
com.google.appengine.api.memcache.MemcacheSerialization.deserialize(MemcacheSerialization.java:
163)
at
com.google.appengine.api.memcache.MemcacheServiceImpl.get(MemcacheServiceImpl.java:
283)
... 43 more
On Dec 17, 3:56 am, Erik <[email protected]> wrote:
> Not sure if it is related, but I was getting some interesting memcache
> errors that I had to work around:
>
> javax.servlet.ServletContext log: Exception while dispatching incoming
> RPC call
> com.google.gwt.user.server.rpc.UnexpectedException: Service method
> 'public abstract java.lang.String
> com.WikiHop.client.SearchPath.find(java.lang.String,java.lang.String)
> throws java.lang.IllegalArgumentException' threw an unexpected
> exception: com.google.appengine.api.memcache.InvalidValueException: IO
> exception parsing value of '3434143'
> at
> com.google.gwt.user.server.rpc.RPC.encodeResponseForFailure(RPC.java:
> 378)
> ...
> Caused by: com.google.appengine.api.memcache.InvalidValueException: IO
> exception parsing value of '3434143'
> at
> com.google.appengine.api.memcache.MemcacheServiceImpl.get(MemcacheServiceImpl.java:
> 289)
> at
> com.google.appengine.api.memcache.jsr107cache.GCache.get(GCache.java:
> 166)
>
> On Dec 16, 2:53 pm, Tom Phillips <[email protected]> wrote:
>
> > Certainly Ikai,
>
> > Firstly, some of my logs (url and classes slightly modified to hide
> > some app details) that show how only the same instance picks up the
> > entry. I'm determining and logging the instance using a UUID that I
> > assign to a static class variable. The key for the cache lookup is
> > passed in as a request query parameter to the followup requests.
>
> > Here are two runs of the code to follow. In each, the bottom log is
> > the cache entry being added. The next two are subsequent requests that
> > both look for the entry. The entry is only found when then instance
> > matches, regardless of which follow-up request.
>
> > This first run shows how the bottom instance is different from the one
> > that services both followup requests. So they don't find the entry:
>
> > 50.16.21.20 - - [16/Dec/2010:11:19:40 -0800] "GET /processg?key=619001
> > W 12-16 11:19AM 40.373 com.mycode.CallProcessGatherServlet doGet:
> > LOOKING IN CACHE on Instance: b7c866f2-d74b-45df-9993-1d2c4705d3d1
> > W 12-16 11:19AM 40.373 com.mycode.CallProcessGatherServlet doGet:
> > Message NOT found in cache for 619001 - building
>
> > 50.16.21.20 - - [16/Dec/2010:11:19:35 -0800] "POST /startreminder?
> > key=619001&pname=Optimal+Physio+Dev&atime=Friday+December+17%2C
> > +2%3A18+PM&rlang=en&rvoice=woman
> > W 12-16 11:19AM 33.173 com.mycode.CallMLServlet doGet: LOOKING IN
> > CACHE on Instance: b7c866f2-d74b-45df-9993-1d2c4705d3d1
> > W 12-16 11:19AM 33.173 com.mycode.CallMLServlet doGet: Message NOT
> > found in cache for 619001 - building
>
> > 0.1.0.2 - - [16/Dec/2010:11:19:08 -0800] "POST /tasks/voicereminder
> > HTTP/1.1" 200 105 "http://cliniconexdev.appspot.com/cron/
> > processreminders?state=new"
> > W 12-16 11:19AM 08.581 com.mycode.CallPhoneAdapter doSend: CACHING
> > message from instance: e4d5452e-c744-4333-b1d4-38eb55f97445
> > W 12-16 11:19AM 08.585 com.mycode.CallPhoneAdapter doSend: Adding to
> > cache with key:619001
> > W 12-16 11:19AM 08.604 com.mycode.CallPhoneAdapter doSend:
> > Successfully cached reminder 619001
>
> > In this second run, the first followup request hits the same instance
> > that added it, and finds it. The second isn't so lucky, hitting a
> > different instance
>
> > 184.73.13.122 - - [16/Dec/2010:11:22:39 -0800] "GET /processg?
> > key=620001
> > W 12-16 11:22AM 38.782 com.mycode.CallProcessGatherServlet doGet:
> > LOOKING IN CACHE on Instance: ff6ef71c-a017-4316-aa81-e77db741702b
> > W 12-16 11:22AM 38.782 com.mycode.CallProcessGatherServlet doGet:
> > Message NOT found in cache for 620001 - building
>
> > 204.236.222.67 - - [16/Dec/2010:11:22:28 -0800] "POST /startreminder?
> > key=620001&pname=Optimal+Physio+Dev&atime=Friday+December+17%2C
> > +2%3A18+PM&rlang=en&rvoice=woman HTTP/1.1" 200 683 -
> > "CallProxy/0.7,gzip(gfe)" "cliniconexdev.appspot.com" ms=24 cpu_ms=23
> > api_cpu_ms=0 cpm_usd=0.000805
> > W 12-16 11:22AM 28.127 com.mycode.CallMLServlet doGet: LOOKING IN
> > CACHE on Instance: b7c866f2-d74b-45df-9993-1d2c4705d3d1
> > W 12-16 11:22AM 28.134 com.mycode.CallMLServlet doGet: Message for
> > entry 620001 FOUND in cache - using
>
> > 0.1.0.2 - - [16/Dec/2010:11:22:06 -0800] "POST /tasks/voicereminder
> > HTTP/1.1" 200 105 "http://cliniconexdev.appspot.com/cron/
> > processreminders?state=new" "AppEngine-Google;
> > (+http://code.google.com/appengine)" "cliniconexdev.appspot.com"
> > ms=506 cpu_ms=1664 api_cpu_ms=941 cpm_usd=0.046287 queue_name=reminder-
> > queue task_name=17196018701084092971
> > W 12-16 11:22AM 05.964 com.mycode.CallPhoneAdapter doSend: CACHING
> > message from instance: b7c866f2-d74b-45df-9993-1d2c4705d3d1
> > W 12-16 11:22AM 05.965 com.mycode.CallPhoneAdapter doSend: Adding to
> > cache with key:620001
> > W 12-16 11:22AM 05.984 com.mycode.CallPhoneAdapter doSend:
> > Successfully cached reminder 620001
>
> > Here is the code that creates the cache (if required) and adds the
> > entry in the first request:
> > Cache cache = null;
>
> > log.warning("CACHING message from instance: " + jvmId);
>
> > try {
> > cache = CacheManager.getInstance().getCache("cache_reminderVoice");
> > } catch (final Exception e) {
> > log.fine("Cache cache_reminderVoice not yet created");
>
> > }
>
> > if (cache == null) {
> > try {
> > cache = CacheManager.getInstance().getCacheFactory()
> > .createCache(Collections.emptyMap());
> > CacheManager.getInstance().registerCache("cache_reminderVoice",
> > cache);
> > } catch (final CacheException e) {
> > log.warning("Could not create/register cache
> > cache_reminderVoice: "
> > + e.getMessage());
> > }
>
> > }
>
> > try {
> > // Put the value into the cache.
> > log.warning("Adding to cache with key:" +
> > reminder.getKeyId().toString());
> > if (parts == null) {
> > log.warning("Hmmmm..parts was null");
> > }
> > cache.put(reminder.getKeyId().toString(), parts);
>
> > // Get the value from the cache just to test it is there
> > final CacheEntry entry = cache.getCacheEntry(reminder.getKeyId()
> > .toString());
> > if (entry != null) {
> > log.warning("Successfully cached reminder " +
> > reminder.getKeyId());
> > } else {
> > log.warning("Could not get cached voice message parts");
> > }
> > } catch (final Exception e) {
> > log.warning("FAILED to cache voice message parts: " +
> > e.getMessage());
> > }
>
> > Here is the code (same in both request handlers) that retrieves the
> > entry from the cache:
>
> > Cache cache = null;
>
> > log.warning("LOOKING IN CACHE on Instance: " +
> > TwilioPhoneAdapter.jvmId);
>
> > try {
> > cache =
> > CacheManager.getInstance().getCache("cache_reminderVoice");
> > if (cache != null) {
> > parts = (VoiceParts) cache.get(key);
> > }
> > if (parts != null) {
> > log.warning("Message for entry " + key + " FOUND in cache -
> > using");
> > }
> > } catch (final Exception e) {
> > log.warning("Cache cache_reminderVoice not yet created");
> > }
>
> > if (parts == null) {
> > log.warning("Message NOT found in cache for " + key + " -
> > building");
> > parts = ...//Builds the parts up from scratch
> > }
>
> > Thanks for checking it out Ikai.
> > Tom
>
> > On Dec 16, 1:32 pm, "Ikai Lan (Google)" <[email protected]>
> > wrote:
>
> > > This is definitely not a design intent. Can you post any code or
> > > reproduction steps?
>
> > > --
> > > Ikai Lan
> > > Developer Programs Engineer, Google App Engine
> > > Blogger:http://googleappengine.blogspot.com
> > > Reddit:http://www.reddit.com/r/appengine
> > > Twitter:http://twitter.com/app_engine
>
> > > On Wed, Dec 15, 2010 at 7:42 PM, Tom Phillips <[email protected]>
> > > wrote:
> > > > I posted on this this in the java forum, but no traction there and I
> > > > suspect it's not java specific.
>
> > > > Memcache entries seem to be being scoped to an instance, not global.
> > > > After a cache entry is made, it can be retrieved fine for any request
> > > > that goes to that same instance. Any request to one of the other
> > > > instances never finds the entry in the cache.
>
> > > > Bug in Always On? Bug in 1.4.0? Design intent?
>
> > > > Thanks,
> > > > Tom
>
> > > > --
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> > > >http://groups.google.com/group/google-appengine?hl=en.
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