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< Erlang ~ strange behavior in pg2 module |
| ptmoy |
 Posted: Thu Mar 17, 2011 3:11 am |
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User
Joined: 24 Dec 2009
Posts: 10
Location: New Jersey, U.S.A.
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I tried the following:
* created a 2-node cluster (nodes a & b).
* call pg2:create(testgroup) from node b.
* call pg2:which_groups(testgroup) from node a.
Take a look at the node-a output. Erlang always returns [] on the first call to pg2:which_groups(). Subsequent calls return "testgroup" as expected. Can someone try this on their installation to see if he/she gets the same result? If yes, does anyone know why Erlang returns an empty list during the first call?
pm@T110:~$ erl -sname b
Erlang R14B01 (erts-5.8.2) [source] [64-bit] [smp:4:4] [rq:4] [async-threads:0] [hipe] [kernel-poll:false]
Eshell V5.8.2 (abort with ^G)
(b@T110)1> net_adm:ping(a@T110).
pong
(b@T110)2> pg2:create(testgroup).
ok
(b@T110)3>
pm@T110:~$ erl -sname a
Erlang R14B01 (erts-5.8.2) [source] [64-bit] [smp:4:4] [rq:4] [async-threads:0] [hipe] [kernel-poll:false]
Eshell V5.8.2 (abort with ^G)
(a@T110)1> pg2:which_groups().
[]
(a@T110)2> pg2:which_groups().
[testgroup]
(a@T110)3> pg2:which_groups().
[testgroup]
[/list] |
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| Hans Bolinder |
| Posted: Mon Mar 21, 2011 9:58 am |
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Joined: 05 Nov 2008
Posts: 24
Location: Stockholm
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> If yes, does anyone know why Erlang returns an empty list
> during the first call?
You need to call pg2:start(). See pg2(3).
Best regards,
Hans Bolinder, Erlang/OTP team, Ericsson |
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| ptmoy |
| Posted: Wed Mar 23, 2011 9:02 pm |
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Joined: 24 Dec 2009
Posts: 10
Location: New Jersey, U.S.A.
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Thanks Hans. That worked.
Documentation for pg2:start() says that: the server doesn't need to be started explicitly, so I was under the impression that when I call pg2:which_group(), Erlang would start the pg2 server automatically if it hadn't been started already. Maybe that's how it should work. |
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| dongdongwu |
| Posted: Thu Sep 20, 2012 6:02 am |
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Joined: 19 Sep 2012
Posts: 236
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