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Backwards Compatibility:
Fully Compatible
Operating System:
ALL
Steps To Reproduce:
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In a 3.1.9 shell (or an earlier shell with --readMode commands):

db.c.drop() db.createCollection("c", {capped: true, size: 1024}); db.c.insert({_id: 1}); db.c.find().addOption(DBQuery.Option.tailable).addOption(DBQuery.Option.awaitData);
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In a 3.1.9 shell (or an earlier shell with --readMode commands): db.c.drop() db.createCollection( "c" , {capped: true , size: 1024}); db.c.insert({_id: 1}); db.c.find().addOption(DBQuery.Option.tailable).addOption(DBQuery.Option.awaitData);
Sprint:
RPL A (10/09/15)

This is a regression introduced under ~~SERVER-20604~~ in commit https://github.com/mongodb/mongo/commit/a8e6c0ebc70fad95a5e05281076cfa4b6db500c2. It affects only the getMore command, not OP_GET_MORE. Affects only development release 3.1.9.

is related to

SERVER-20604 CSRS with protocol version 1 is slow when doing reads from secondaries