Inserting a document with 500,000 unique words can generate a group commit of >512MB. Trips assertion failure in AlignedBuilder::growReallocate, in util/alignedbuffer.cpp.

 91             verify( a <= 512*1024*1024 );

This leads to a server shutdown. Reproduce with (after creating a {{

}} index):

>>> import pymongo
>>> testdb = pymongo.MongoClient()['test']
>>> num_words_in_doc = 500 * 1000
>>> large_doc = {'content':" ".join(map(str, range(1,num_words_in_doc+1)))}
>>> num_docs = 50
>>> for i in xrange(num_docs):
...   large_doc['_id'] = i
...   testdb.foo.insert(large_doc)
... 

In my environment above, assertion trips on insert #32. Logfile attached.