I believe you are right about not clearing keys.
Spot on
Sent on a Sprint Samsung Galaxy S® 5
-------- Original message --------
From: Henrik Schröder <skro...@gmail.com>
Date:05/19/2014 11:09 PM (GMT-05:00)
To: memcached@googlegroups.com
Subject: Re: Stats in a clustered environment - Getting keys
I can guarantee you that the client only stores each key on a single server. :-)
I would guess that you get your results because you haven't cleared your cache
servers between tests, or that your slab method of getting data isn't affected
by flushing each server, or something similar.
Try with a simpler test. Set three keys through the client, then manually
telnet to each server and try to get each and see what happens.
/Henrik
On Thu, May 15, 2014 at 1:39 PM, Jonathan Minond <jmin...@gmail.com> wrote:
I am seeing something that struck me as a little odd.
>From my reading, as I understand, in a memcached environment, each memcache
>node contains a portion of the objects in the cluster.
So, I would expect something like if I have 27 keys and 3 nodes.
Each node is holding ~9 keys/objects.... is that correct to assume?
So, to test out...
<add key="MemCached.Endpoint" value="server1:11211,server2:11211,server3:11211"
/>
As a client, I am using the BeIT Memcached Client for .NET
(code.google.com/p/beitmemcached/)
To get the keys, I am using Telnet, to get slabs, and then the items, as
described by Boris here: groups.google.com/forum/#!topic/memcached/YyzonP9HUi0
1) I loop through my collection of hosts
2) Do the telnet process against that host
3) Collect all the info.
It seems to me, that I am getting the same keys listed on all 3 servers..... ?
I did not expect this, and I am hoping someone can explain.
To clarify:
This is how I do a GET:
And this is how I am trying to get the list of keys.... there is a bit of debug
code buried in there, but it should still be clear:
(TelNetConn = A simple telnet helper)
List<string> ret = new List<string>();
string memCacheEndPointAddress =
Config.GetValueWithDefault("MemCached.Endpoint", "localhost:11211");
string[] points = memCacheEndPointAddress.Split(new[] { ',' },
StringSplitOptions.RemoveEmptyEntries);
foreach (string h in points)
{
string[] hParts = h.Split(new[] { ':' },
StringSplitOptions.RemoveEmptyEntries);
string cacheHost = hParts[0];
TelNetConn tc = new TelNetConn(cacheHost,
Convert.ToInt32(hParts[1]));
if (tc.IsConnected)
{
ret.Add("HOST: " + cacheHost);
tc.WriteLine("stats items");
String s = tc.Read();
String[] sLines = s.Split(
new string[] { Environment.NewLine },
StringSplitOptions.RemoveEmptyEntries);
foreach (string sl in sLines)
{
if (sl == "END") continue;
String[] slParts = sl.Split(new[] { ':' },
StringSplitOptions.RemoveEmptyEntries);
int slabID = Convert.ToInt32(slParts[1]);
string slabType = slParts[2];
if (slabType.StartsWith("number") ||
slabType.StartsWith("age"))
{
tc.WriteLine("stats cachedump " + slabID +
" 100");
s = tc.Read();
if (!String.IsNullOrEmpty(s))
{
if (s != "END")
{
// ret.Add("FULL: " + s);
if (s.StartsWith("ITEM "))
{
string[] itemparts =
s.Split(new[] { ' ' }, StringSplitOptions.None);
string key = itemparts[1];
ret.Add("ITEM: " + key);
}
}
}
}
}
}
else
{
ret.Add("HOST: " + cacheHost + " NOT CONNECTED");
}
tc.Dispose();
}
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