[erlang-questions] Mnesia: inconsistent views without netsplit?
Tue May 3 17:52:30 CEST 2016
On Wed, Apr 27, 2016 at 12:32 PM, Daniel Dormont
> On Wed, Apr 27, 2016 at 3:03 AM, Dan Gudmundsson <dangud@REDACTED> wrote:
>> 1) No clue. But would be interested if you have an idea what have gone
>> 2) mnesia:del_table_copy(...) followed by mnesia:add_table_copy(..) should
>> re-copy the table from the other nodes.
> Thanks. I'll give that a try.
> Along the same lines I was wondering: is there a setting I can use to
> adjust the sensitivity of the system's detection of node disconnects,
> either generically or specifically within Mnesia? My production
> environment appears to have occasional momentary network hiccups (it's
> Amazon EC2 instances spanning zones within a region, for anyone
> curious). I'd like to make it less likely for those hiccups to cause
> Mnesia to enter an inconsistent state, even if it means real failures
> take a little longer to detect.
If the "hiccups" are high latency, you can look at adjusting
net_ticktime, documented here.
>> On Tue, Apr 26, 2016 at 9:30 PM Daniel Dormont <dan@REDACTED>
>>> Hi all,
>>> I have a three node Mnesia cluster (hosting a somewhat outdated
>>> version of ejabberd, but I'm not sure that matters). I have a table
>>> that is stored as ram_copies on all three nodes. Yet, this table has
>>> differing numbers of records among the three.
>>> The table info from one of them is pasted below. Running the same
>>> query on one of my other nodes, I get more or less the same result,
>>> but the "size" is very different: 553 vs 867. And indeed, there are
>>> individual records that turn up in a mnesia:read/2 or
>>> mnesia:dirty_read/2 on one node and not the other.
>>> Yet, nothing in my log indicates that there was ever a netsplit or
>>> disconnection. So I have two questions:
>>> 1) What might cause this? and
>>> 2) Is there any way, especially given I know which records are
>>> affected, to force some kind of replication on this table without
>>> completely restarting one of the nodes?
>>> Dan Dormont
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