Changes between Initial Version and Version 1 of QuotaManagement

Timestamp:

2007-12-15T00:51:43Z (17 years ago)

Author:

warner

Comment:

write down my notes on a first plan for accounting and non-generic introduction

QuotaManagement

@@ +1 @@
+Here's a basic plan for how to configure "managed introducers". The basic
+idea is that we have two types of grids: managed and unmanaged. The current
+code implements "unmanaged" grids: complete free-for-all, anyone who can get
+to the Introducer can thus get to all the servers, anyone who can get to a
+server gets to use as much space as they want. In this mode, each client uses
+their 'introducer.furl' to connect to the the Introducer, which serves two
+purposes: tell the client about all the servers they can use, and tell all
+other clients about the server being offered by the new node.
+
+The "managed introducer" approach is for an environment where you want to be
+able to keep track of who is using what, and to prevent unmanaged clients
+from using any storage space.
+
+In this mode, we have an Account Manager instead of an Introducer. Each
+client gets a special, distinct facet on this account manager: this gives
+them control over their account, and allows them to access the storage space
+enabled by virtue of having that account. This is stored in
+"my-account.furl", which replaces "introducer.furl" for this purpose.
+
+In addtion, the servers get an "account-manager.furl" instead of an
+"introducer.furl". The servers connect to this object and offer themselves as
+storage servers. The Account Manager remembers a list of all the
+currently-available storage servers.
+
+When a client wants more storage servers (perhaps updated periodically, and
+perhaps using some sort of minimal update protocol (Bloom Filters!)), they
+contact their Account object and ask for introductions to storage servers.
+This causes the Account Manager to go to all servers that the client doesn't
+already know about and tell them "generate a FURL to a facet for the benefit
+of client 123. Give me that FURL.". The Account Manager then sends the list
+of new FURLs to the client, who adds them to its peerlist. This peerlist
+contains tuples of (nodeid, FURL).
+
+The Storage Server will grant a facet to anyone that the Account Manager
+tells them to. The Storage Server is really just updating a table that maps
+from a random number (the FURL's swissnum) to the system-wide small-integer
+account number. The FURL will dereference to an object that adds an
+accountNumber=123 to all write() calls, so that they can be stored in leases.
+
+
+In this approach, the Account Manager is a bottleneck only for the initial
+contact: the clients all remember their list of Storage Server FURLs for a
+long time. Clients must contact their Account to take advantage of new
+servers: the update traffic for this needs to be examined. I can imagine this
+working reasonably well up to a few hundred servers and say 100k clients if
+the clients are only asking about new servers once a day (one query per
+second).