[appengine-java] Re: Which datastore exceptions are appropriate for Re-try
Leszek, thanks much!
On Nov 9, 11:20 am, Diana Cruise wrote:
> WSouza, what scenario triggers UnknownException?
>
> On Nov 9, 3:24 am, leszek wrote:
>
>
>
> >http://code.google.com/intl/pl/appengine/docs/java/datastore/transact...
>
> >
> > for (int i = 0; i < NUM_RETRIES; i++) {
> > pm.currentTransaction().begin();
>
> > ClubMembers members = pm.getObjectById(ClubMembers.class,
> > "k12345");
> > members.incrementCounterBy(1);
>
> > try {
> > pm.currentTransaction().commit();
> > break;
>
> > } catch (JDOCanRetryException ex) {
> > if (i == (NUM_RETRIES - 1)) {
> > throw ex;
> > }
> > }
> > }
> > - Hide quoted text -
>
> - Show quoted text -
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[appengine-java] Re: Which datastore exceptions are appropriate for Re-try
WSouza, what scenario triggers UnknownException?
On Nov 9, 3:24 am, leszek wrote:
> http://code.google.com/intl/pl/appengine/docs/java/datastore/transact...
>
>
> for (int i = 0; i < NUM_RETRIES; i++) {
> pm.currentTransaction().begin();
>
> ClubMembers members = pm.getObjectById(ClubMembers.class,
> "k12345");
> members.incrementCounterBy(1);
>
> try {
> pm.currentTransaction().commit();
> break;
>
> } catch (JDOCanRetryException ex) {
> if (i == (NUM_RETRIES - 1)) {
> throw ex;
> }
> }
> }
>
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[appengine-java] Re: Which datastore exceptions are appropriate for Re-try
http://code.google.com/intl/pl/appengine/docs/java/datastore/transactions.html
for (int i = 0; i < NUM_RETRIES; i++) {
pm.currentTransaction().begin();
ClubMembers members = pm.getObjectById(ClubMembers.class,
"k12345");
members.incrementCounterBy(1);
try {
pm.currentTransaction().commit();
break;
} catch (JDOCanRetryException ex) {
if (i == (NUM_RETRIES - 1)) {
throw ex;
}
}
}
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"Google App Engine for Java" group.
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[appengine-java] Re: Which datastore exceptions are appropriate for Re-try
ApiProxy.UnknownException (sometimes) On Nov 6, 5:22 pm, Diana Cruise wrote: > There are only 5 exceptions documented for the datastore at the link > below: > > http://code.google.com/appengine/docs/java/javadoc/com/google/appengi... > > From the descriptions, it appears only 2 of 5 are conditions where a > re-try may succeed. They are: > > DatastoreFailureException > DatastoreTimeoutException > > Can anyone confirm from their experience that these are the only > appropriate to re-try a transaction? > > For example, when you hit the 30s timeout limit I assume the timeout > exception above is triggered. Or, what if your transaction fails due > to another update in-progress on the same entity group...what > exception gets thrown for that? Clearly, you would want to re-try in > that case! > > Thanks! --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Google App Engine for Java" group. To post to this group, send email to google-appengine-java@googlegroups.com To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en -~--~~~~--~~--~--~---
