I Have Setup master slave replication in mongo its working fine for few month then after that suddenly replication fails.I have started again with initial sync but during sync after a specific point it will again start resync and these process going on and on and slave have not complete their initial sync.
migrated from stackoverflow.com Jul 15 '14 at 9:31
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One reason could be that your oplog is too small.
On the master:
Resizing the oplog is quite easy, if this is indeed your problem. The documentation is here: http://docs.mongodb.org/manual/tutorial/change-oplog-size/