If you are using the experimental Java MapReduce library for App Engine, you are strongly encouraged to update to the latest version of the library in the public svn: https://code.google.com/p/appengine-mapreduce/source/checkout
Background: We are rolling out a fix to a long standing interaction bug between the experimental MapReduce library and the experimental Files API that, in certain circumstances, results in dropped data. Specifically this bug can cause some records emitted by the Map to be excluded from the input to Reduce. The bugfix involves patches to both the Files API and Java MapReduce. Unfortunately older versions of the Java MapReduce library running against the patched Files API will drop Map output under more common circumstances. The Files API fix will roll out on its own (no action required by you), but in order to avoid dropped data you must update to the latest version of the Java MapReduce library<https://code.google.com/p/appengine-mapreduce/source/checkout> . <https://code.google.com/p/appengine-mapreduce/source/checkout> We apologize for the trouble. Rest assured we are working aggressively to move MapReduce into a fully supported state. Tom Kaitchuck on behalf of the Google App Engine Team -- You received this message because you are subscribed to the Google Groups "Google App Engine" group. To unsubscribe from this group and stop receiving emails from it, send an email to google-appengine+unsubscr...@googlegroups.com. To post to this group, send email to google-appengine@googlegroups.com. Visit this group at http://groups.google.com/group/google-appengine?hl=en. For more options, visit https://groups.google.com/groups/opt_out.
