This document contains a presentation in Czech about email storage and replication. It discusses storing petabytes of email data across multiple data centers. It explains how email is distributed and stored, including using a journal, address book, and replication log. It also covers concepts like version clocks for replication and handling sets, adds, and removes across data centers to keep the data in sync.

1. From: =?utf-8?q?Michal_Bukovsk=C3=BD?=
<michal.bukovsky@firma.seznam.cz>
To: undisclosed-recipients: ;
Subject: =?utf-8?q?Nov=C3=BD_Email=2Ecz?=
Date: Sat, 26 May 2012 16:00:00 +0200 (CEST)
Content-Type: multipart/x-presentation;
boundary=--slide--

2. ----slide--
Content-Type: text/x-presentation-content
Petabyte sem, petabyte tam
Na HW ani SW se fakt nedá spolehnout
No a co teprve na server house

3. ----slide--
Content-Type: text/x-petabyte-storage
Web
Internet
POP3
Ebox
IMAP
SMTP
DH1 DH2 DH3
00*, 11*, ... 00*, 11*, ... 22*, 33*, …
Princip rozložení:
EMAIL → 0011223344556677 → DH1

4. ----slide--
Content-Type: text/x-acid
msg journal abook
333
1: <0x1, 30> 1: <0x11, 10> 1: 1:
(msg: {rm 1}, msg: {ins 2}, abook...)
2: <0x3>, 33> 2: <0x3>, 33> 2: 2:
3: <0x9>, 22> 3: <0x9>, 22> 3: 3:
4: <0x2>, 44> 4: <0x2>, 44> 4: 4: <0x6>, 11>
0x1 0x1
0x6
0x2 0x2
0x3 0x3
.
.
.
.
.
.

5. ----slide--
Content-Type: text/x-change-cache
FS K/V Cache App RPC JS
I. naplnění cache II. aplikační kód
III. commit
TxRW_t tx("/path/to/user/storage");
tx->messages->deliver(msg);
tx.commit();

6. ----slide--
Content-Type: text/x-replication
Ebox NG Ebox TTC
ID: 2, 4, 6, 8, .... ID: 1, 3, 5, ....
Proxy
Internet
Replikační log:
{ { {
msg: {...} msg: {...} msg: {...}
id: 3 id: 4 id: 1
vclock: {0, 1, 123456} vclock: {2, 1, 123460} vclock: {8, 0, 123477}
} } }

7. ----slide--
Content-Type: text/x-replication-set-vs-set
Ebox NG Ebox TTC
{ {
flags: {unread = true} flags: {unread = true}
body: "Ahoj, ......" body: "Ahoj, ......"
vclock: {0, 0, 123456} vclock: {0, 0, 123456}
} }
{ {
flags: {unread = false} flags: {unread = false}
body: "Ahoj, ......" body: "Ahoj, ......"
vclock: {0, 1, 123460} vclock: {1, 0, 123461}
} }
{ {
flags: {unread = false} flags: {unread = false}
body: "Ahoj, ......" body: "Ahoj, ......"
vclock: {1, 1, 123461} vclock: {1, 1, 123461}
} }

8. ----slide--
Content-Type: text/x-replication-set-vs-remove
Ebox NG Ebox TTC
{ {
flags: {unread = false} flags: {unread = false}
body: "Ahoj, ......" body: "Ahoj, ......"
vclock: {0, 0, 123456} vclock: {0, 0, 123456}
} }
{ {
flags: {unread = true} flags: {unread = false}
body: "Ahoj, ......" body: "Ahoj, ......"
vclock: {0, 1, 123460} vclock: {1, 0, 123456}
} }
{ {
flags: {unread = true} flags: {unread = true}
body: "Ahoj, ......" body: "Ahoj, ......"
vclock: {0, 1, 123460} vclock: {0, 1, 123460}
} }

9. ----slide--
Content-Type: text/x-questions
Děkuji za pozornost
Michal Bukovský <michal.bukovsky@firma.seznam.cz>
----slide----