Set tap_keepalive to 5 minutes in membase buckets.

This allows us to re-use TAP queues if we name them.

Change-Id: Ia994ec6c47c2b32ec02653946abec921553125a0
Reviewed-on: http://review.membase.org/4701
Reviewed-by: Dustin Sallings <dustin@spy.net>
Tested-by: Dustin Sallings <dustin@spy.net>

src/ns_bucket.erl

@@ -104,15 +104,21 @@ config_string(BucketName) ->
                         "tap_keepalive=~B;"
                         "tap_noop_interval=~B;"
                         "max_txn_size=~B;"
-                        "max_size=~B;initfile=~s;dbname=~s",
+                        "max_size=~B;"
+                        "initfile=~s;"
+                        "tap_keepalive=~B;"
+                        "dbname=~s;",
                         [proplists:get_value(ht_size, BucketConfig),
                          proplists:get_value(ht_locks, BucketConfig),
                          proplists:get_value(db_shards, BucketConfig, 4),
                          proplists:get_value(tap_keepalive, BucketConfig, 0),
                          proplists:get_value(tap_noop_interval, BucketConfig, 20),
                          proplists:get_value(max_txn_size, BucketConfig, 1000),
                          MemQuota,
+                         %% Five minutes, should be enough time for
+                         %% vbucketmigrator to restart.
                          proplists:get_value(initfile, EngineConfig),
+                         proplists:get_value(tap_keepalive, EngineConfig, 300),
                          DBName])),
                 {CFG, {MemQuota, DBName}};
             memcached ->