Beolink.org
RestFS Internals
Fabrizio Manfredi Furuholmen
Federico Mosca
Beolink.org
Europython 2013
2
Agenda
 Introduction
 Goals
 Principals
 RestFS
 Architecture
 Internals
 Sub project...
Beolink.orgIntroduction
3
Europython 2013
Zetabyte
10007 bytes
1021 bytes
1,000,000,000,000,000,000,000 bytes
All of the d...
Beolink.org
4
GOAL 1/2
Europython 2013
Create a free available Cloud Storage Software
Beolink.org
5
GOAL 2/2
Create a
framework for
testing a new
technologies and
paradigm
Europython 2013
Beolink.orgPrinciple 1/3
6
“Moving Computation
is
Cheaper than Moving Data”
Europython 2013
Beolink.orgPrinciple 2/3
7
“There is always a failure waiting
around the corner”
Europython 2013
*Werner Vogel
Beolink.orgPrinciple 3/3
8
“Decompose into small loosely
coupled, stateless building
blocks”
Europython 2013
*’ Leaving a ...
Beolink.org
9
RestFS
Europython 2013
Beolink.org
10
RestFS Key Words
RestFS
Cell
collection of servers
Bucket
virtual container,
hosted by one or
more server
O...
Beolink.org
11
RestFS Components
Europython 2013
Cell
Bucket N
Bucket X
Objects
Objects
Bucket/Cell Cells Object
S3:
bucke...
Beolink.orgFive main areas
12
Objects
• Separation btw data and
metadata
• Each element is marked
with a revision
• Each e...
Beolink.orgBucket Discovery
13
Client
DNS
Lookup
Cell 1
Cell 2
N server
N server
Bucket name Cell RL
IP list
Bucket name
S...
Beolink.orgObject
14
Data Metadata
Segments
Object
Attributes
set by user
Europython 2013
Properties
ACL
Ext Properties
Bl...
Beolink.orgCell Interaction
15
Client
Metadata
Client Cache
Europython 2013
Cell
Resource
Locator
Beolink.orgCentral Service for Domain
16
Client
DNS
Lookup
SrvCell
Create
Bucket
Cell
Service
Service name Cell RL
IP list...
Beolink.org
17
Cache client side
DNS
RestFS Metadata
RestFS Block
Federated Auth
Callbacks
Metadata
cache
Block
cache
Rest...
Beolink.org
18
Server Architecture
S3
Service
Storage
Mgr
Auth
Manager
Meta
Mgr
Storage
Driver
Token
Driver
RestFS
RPC
Res...
Beolink.org
19
Backends
Europython 2013
Service
• DNS
• SQL
Auth
• SQL
Token
• NoSQL
• Distributed Cache
RL
• SQL
• Memory...
Beolink.org
20
Bucket
Europython 2013
Beolink.org
21
Bucket
Europython 2013
 Cell Ips
The bucket is stored in the DNS for
lookup, the ip address returned by DN...
Beolink.org
22
Bucket Type
Europython 2013
Filesystm
The bucket is used as a filesystem
Logging
Logging operation done o...
Beolink.org
23
Objects
Europython 2013
Beolink.org
24
Object
Europython 2013
Object Property
Object Property Ext
Object Stats
Object ACL
Segments
Object
zeb...
Beolink.org
25
Object Type
Europython 2013
Data
Contains files
Folder
Special object that contain others
objects
Mount ...
Beolink.org
26
Object Properties
Europython 2013
Key Value Pair
Key for everything
- Metadata: BUCKET_NAME.UUID
- Block: B...
Beolink.org
27
Segments
Europython 2013
Beolink.orgSegments
28
Segment 1
Europython 2013
Pos 1 : Hash
Serial
Pos 2 : Hash
Pos 3 : Hash
Pos n : Hash
Segment 1
Pos ...
Beolink.orgSegments
29
“Serial vs Hash”
Europython 2013
Beolink.org
30
Object Versioning
Europython 2013
Cell
Bucket N
Objects
Objects
Objects
Object Pointer
Object point to the...
Beolink.org
31
Protocols
Europython 2013
Beolink.orgProtocols
32
 DNS
 RestFS
 S3 Interface
Europython 2013
Beolink.org
33
RestFS Protocol
WebSocket
is a web technology for multiplexing bi-directional, full-
duplex communications ...
Beolink.org
34
RestFS Protocol
Meta Operation
- Bucket
- Object id
- Operation
- List elements
Operation Packets
Collect...
Beolink.org
35
Locks
Europython 2013
Beolink.org
36
Locks vs No consistency
Europython 2013
Beolink.org
37
Locks
Europython 2013
OpLocks
Time base
Token base
Ordering
Conflict are management with the serial
prop...
Beolink.org
38
Cache
Europython 2013
Beolink.org
39
Cache
Publish–subscribe
“… is a messaging pattern where senders of messages,
called publishers, do not prog...
Beolink.org
40
Block Storage
Europython 2013
Beolink.org
41
Backend: Storage
Kademlia's XOR distance is easier to calculate.
Kademlia's routing tables makes routing ta...
Beolink.org
42
Code
Europython 2013
Beolink.org
43
Pluggable
Europython 2013
Protocol
• Connection Handler
• Data transcoding
Service
• High level Operations ...
Beolink.org
44
NoSQL as much as Possible
Key Value
- Key in memory
- Value on disc
Example of benchmark result
The test wa...
Beolink.org
45
What we are using
Module Software
Storage Filesystem, DHT (kademlia, Pastry*)
Metadata SQL(mysql,sqlite), N...
Beolink.orgWhat is it good for ?
46
User
• Home directory
• Remote/Internet disks
Application
• Object storage
• Shared sp...
Beolink.orgAdvantages
47
High
reliability
Distributed
Decentralized
Data replication
Nearly
unlimited
scalability
Horizont...
Beolink.orgRoadmap
48
 0.1
Single server on storage (No DHT)
S3 Interface
Federated Authentication
 0.2 Release (coming ...
Beolink.orgSupport
49
Europython 2013
Beolink.org
Thank you
http://restfs.beolink.org
manfred.furuholmen@gmail.com
fege85@gmail.com
Beolink.org
51
Backend: Storage
Transport Layer ZeroMQ
Storage Compressed DAta
Europython 2013
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Restfs internals

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The RestFS is an experimental project to develop an open-source distributed filesystem for large environments. It is designed to scale up from a single server to thousand of nodes and delivering a high availability storage system with special features for high i/o performance and network optimization for work better in WAN environment.

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  • The session devided in three main parts, a small introduction on ecosystem, the presentation of the Goals and architecture of Restfs and a small demo of same basic capabilties of the RestFS
  • I don’t know in which point of the curve we are, you can understand the end of all tecnologies is coming But on the other hand we can’t find mature tecnologies we still in innovation
  • For this reason we start a RestFS project, because we want re thinking the storage,Last but not the least Today you can’t find cloud implementation that you can setup, only service are avaible no software but also make testing and experiment on new tecnologieFrom one side we want create scalable system On other side we want more framework for test.
  • For this reason we start a RestFS project, because we want re thinking the storage,Last but not the least Today you can’t find cloud implementation that you can setup, only service are avaible no software but also make testing and experiment on new tecnologieFrom one side we want create scalable system On other side we want more framework for test.
  • The principle used for all decicion in design and to identify the right or best solution is base on the idea behind hadoop or GFS and it is
  • The principle used for all decicion in design and to identify the right or best solution is base on the idea behind hadoop or GFS and it is
  • The principle used for all decicion in design and to identify the right or best solution is base on the idea behind hadoop or GFS and it is
  • For this reason we start a RestFS project, because we want re thinking the storage,Last but not the least Today you can’t find cloud implementation that you can setup, only service are avaible no software but also make testing and experiment on new tecnologieFrom one side we want create scalable system On other side we want more framework for test.
  • Now I will describe a little bit more RestFS, functionality and architcture
  • Now I will describe a little bit more RestFS, functionality and architcture
  • Wedevide the design in 5 areas
  • Hash for change by clientSerial for keep sequence and history (updated by server)
  • Hash for change by clientSerial for keep sequence and history (updated by server)
  • Hash for change by clientSerial for keep sequence and history (updated by server)
  • Hash for change by clientSerial for keep sequence and history (updated by server)
  • Hash for change by clientSerial for keep sequence and history (updated by server)
  • Hash for change by clientSerial for keep sequence and history (updated by server)
  • BSON [bee · sahn], short for Bin­ary JSON, is a bin­ary-en­coded seri­al­iz­a­tion of JSON-like doc­u­ments. Like JSON, BSON sup­ports the em­bed­ding of doc­u­ments and ar­rays with­in oth­er doc­u­ments and ar­rays. BSON also con­tains ex­ten­sions that al­low rep­res­ent­a­tion of data types that are not part of the JSON spec. For ex­ample, BSON has a Date type and a BinData type.BSON can be com­pared to bin­ary inter­change for­mats, like Proto­col Buf­fers. BSON is more "schema-less" than Proto­col Buf­fers, which can give it an ad­vant­age in flex­ib­il­ity but also a slight dis­ad­vant­age in space ef­fi­ciency (BSON has over­head for field names with­in the seri­al­ized data).
  • BSON [bee · sahn], short for Bin­ary JSON, is a bin­ary-en­coded seri­al­iz­a­tion of JSON-like doc­u­ments. Like JSON, BSON sup­ports the em­bed­ding of doc­u­ments and ar­rays with­in oth­er doc­u­ments and ar­rays. BSON also con­tains ex­ten­sions that al­low rep­res­ent­a­tion of data types that are not part of the JSON spec. For ex­ample, BSON has a Date type and a BinData type.BSON can be com­pared to bin­ary inter­change for­mats, like Proto­col Buf­fers. BSON is more "schema-less" than Proto­col Buf­fers, which can give it an ad­vant­age in flex­ib­il­ity but also a slight dis­ad­vant­age in space ef­fi­ciency (BSON has over­head for field names with­in the seri­al­ized data).
  • Hash for change by clientSerial for keep sequence and history (updated by server)
  • Hash for change by clientSerial for keep sequence and history (updated by server)
  • Hash for change by clientSerial for keep sequence and history (updated by server)
  • Hash for change by clientSerial for keep sequence and history (updated by server)
  • Hash for change by clientSerial for keep sequence and history (updated by server)
  • Restfs internals

    1. 1. Beolink.org RestFS Internals Fabrizio Manfredi Furuholmen Federico Mosca
    2. 2. Beolink.org Europython 2013 2 Agenda  Introduction  Goals  Principals  RestFS  Architecture  Internals  Sub project  Conclusion  Developments
    3. 3. Beolink.orgIntroduction 3 Europython 2013 Zetabyte 10007 bytes 1021 bytes 1,000,000,000,000,000,000,000 bytes All of the data on Earth today 150GB of data per person 2% of the data on Earth in 2020
    4. 4. Beolink.org 4 GOAL 1/2 Europython 2013 Create a free available Cloud Storage Software
    5. 5. Beolink.org 5 GOAL 2/2 Create a framework for testing a new technologies and paradigm Europython 2013
    6. 6. Beolink.orgPrinciple 1/3 6 “Moving Computation is Cheaper than Moving Data” Europython 2013
    7. 7. Beolink.orgPrinciple 2/3 7 “There is always a failure waiting around the corner” Europython 2013 *Werner Vogel
    8. 8. Beolink.orgPrinciple 3/3 8 “Decompose into small loosely coupled, stateless building blocks” Europython 2013 *’ Leaving a Legacy System Revisited’ Chad Fowler
    9. 9. Beolink.org 9 RestFS Europython 2013
    10. 10. Beolink.org 10 RestFS Key Words RestFS Cell collection of servers Bucket virtual container, hosted by one or more server Object entity (file, dir, …) contained in a Bucket Europython 2013
    11. 11. Beolink.org 11 RestFS Components Europython 2013 Cell Bucket N Bucket X Objects Objects Bucket/Cell Cells Object S3: bucket_name.mydomain.com/object_name RestFS: bucket_name.mydomain.com Rpc : bucket_name object_name object Bucket Cell
    12. 12. Beolink.orgFive main areas 12 Objects • Separation btw data and metadata • Each element is marked with a revision • Each element is marked with an hash. Cache • Client side • Callback/Notify • Persistent Transmission • Parallel operation • Http like protocol • Compression • Transfer by difference Distribution • Resource discovery by DNS • Data spread on multi node cluster • Decentralize • Independents cluster • Data Replication Security • Secure connection • Encryption client side, • Extend ACL • Delegation/Federation • Admin Delegation Europython 2013
    13. 13. Beolink.orgBucket Discovery 13 Client DNS Lookup Cell 1 Cell 2 N server N server Bucket name Cell RL IP list Bucket name Server list + Load info Server Priority Type IP 1 .. … Server list priority List Europython 2013
    14. 14. Beolink.orgObject 14 Data Metadata Segments Object Attributes set by user Europython 2013 Properties ACL Ext Properties Block 1 Block 2 Block n Block … HashHashHashHash SerialSerialSerialSerialSerial
    15. 15. Beolink.orgCell Interaction 15 Client Metadata Client Cache Europython 2013 Cell Resource Locator
    16. 16. Beolink.orgCentral Service for Domain 16 Client DNS Lookup SrvCell Create Bucket Cell Service Service name Cell RL IP list Server Priority Type IP 1 .. … Server list priority List Europython 2013
    17. 17. Beolink.org 17 Cache client side DNS RestFS Metadata RestFS Block Federated Auth Callbacks Metadata cache Block cache RestFS Block RestFS Block Persistent Cache Resource Locator Europython 2013 ServerList Tokens Pub/Sub List Temporary Locks
    18. 18. Beolink.org 18 Server Architecture S3 Service Storage Mgr Auth Manager Meta Mgr Storage Driver Token Driver RestFS RPC Resource Manager Distributed Cache Callbacks Manager Meta Driver Auth Driver Callbacks Driver Auth InterfaceManagersDrivers Plugin Resource Locator Backends Europython 2013 Token Sub/Pu b Token Manager Resource Driver MetaService RLService CallbackService AuthService TokenService BlockService Locks Mgr Locks Driver LocksService
    19. 19. Beolink.org 19 Backends Europython 2013 Service • DNS • SQL Auth • SQL Token • NoSQL • Distributed Cache RL • SQL • Memory Meta • NoSQL • Distributed Cache CallBack • NoSQL Locks • NoSQL • Distributed Cache MultiqueryVsSingleQuery - Dedicated storage infrastructure per Service - Distributed Memory cache - One or more DB per Driver
    20. 20. Beolink.org 20 Bucket Europython 2013
    21. 21. Beolink.org 21 Bucket Europython 2013  Cell Ips The bucket is stored in the DNS for lookup, the ip address returned by DNS are the Cell RL address  Property The property element is a collection of object information, with this element you can retrieve the default value for the bucket (logging level, security level, ect). - Property - Property Ext - Property ACL - Property Stats Object Serialized Backends agnostic on information stored Bucket Name zebra Property segment_size= 512 block_size = 16k max_read’=1000 storage_class=STANDARD compression= none …
    22. 22. Beolink.org 22 Bucket Type Europython 2013 Filesystm The bucket is used as a filesystem Logging Logging operation done on the specific Bucket Replica RO Bucket shadow replication … Custom definition
    23. 23. Beolink.org 23 Objects Europython 2013
    24. 24. Beolink.org 24 Object Europython 2013 Object Property Object Property Ext Object Stats Object ACL Segments Object zebra.c1d2197420bd41ef24fc665f228e2c76e98da247 Segment-id 1:16db0420c9cc29a9d89ff89cd191bd2045e47378 2:9bcf720b1d5aa9b78eb1bcdbf3d14c353517986c 3:158aa47df63f79fd5bc227d32d52a97e1451828c 4:1ee794c0785c7991f986afc199a6eee1fa4 5:c3c662928ac93e206e025a1b08b14ad02e77b29d … vers:1335519328.091779 Property segment_size= 512 block_size = 16k content_type = md5=ab86d732d11beb65ed0183d6a87b9b0 max_read’=1000 storage_class=STANDARD compression= none …
    25. 25. Beolink.org 25 Object Type Europython 2013 Data Contains files Folder Special object that contain others objects Mount point Contains the name of the buckets Link Contains the name of the objects Immutable Gold image Custom Defined by the users Cell Bucket N Objects Cell Bucket N Objects
    26. 26. Beolink.org 26 Object Properties Europython 2013 Key Value Pair Key for everything - Metadata: BUCKET_NAME.UUID - Block: BUCKET_NAME.UUID Serial Each element has a version which is identified by a serial. Object Serialized Backends agnostic on information stored Default Root Object For each bucket is defined a default root object with object id ROOT Nosql Storage Key: serialized object Object zebra.c1d2197420bd41ef24fc665f228e2c76e98da247 Segment-id 1:16db0420c9cc29a9d89ff89cd191bd2045e47378 2:9bcf720b1d5aa9b78eb1bcdbf3d14c353517986c 3:158aa47df63f79fd5bc227d32d52a97e1451828c 4:1ee794c0785c7991f986afc199a6eee1fa4 5:c3c662928ac93e206e025a1b08b14ad02e77b29d … vers:1335519328.091779 Property segment_size= 512 block_size = 16k content_type = md5=ab86d732d11beb65ed0183d6a87b9b0 max_read’=1000 storage_class=STANDARD compression= none …
    27. 27. Beolink.org 27 Segments Europython 2013
    28. 28. Beolink.orgSegments 28 Segment 1 Europython 2013 Pos 1 : Hash Serial Pos 2 : Hash Pos 3 : Hash Pos n : Hash Segment 1 Pos 1 : Hash Serial Pos 2 : Hash Pos 3 : Hash Pos n : Hash Segment n Pos 1 : Hash Serial Pos 2 : Hash Pos 3 : Hash Pos n : Hash N Segment = (Object Size/block size)/segment size
    29. 29. Beolink.orgSegments 29 “Serial vs Hash” Europython 2013
    30. 30. Beolink.org 30 Object Versioning Europython 2013 Cell Bucket N Objects Objects Objects Object Pointer Object point to the previous one Only CreateBlock Client has to use only createBlock operation New ID for the old Object Segment Difference
    31. 31. Beolink.org 31 Protocols Europython 2013
    32. 32. Beolink.orgProtocols 32  DNS  RestFS  S3 Interface Europython 2013
    33. 33. Beolink.org 33 RestFS Protocol WebSocket is a web technology for multiplexing bi-directional, full- duplex communications channels over a single TCP connection. This is made possible by providing a standardized way for the server to send content to the browser without being solicited by the client, and allowing for messages to be passed back and forth while keeping the connection open… JSON-RPC is lightweight remote procedure call protocol similar to XML-RPC. It's designed to be simple BSON short for Binary JSON, is a binary-encoded serialization of JSON-like documents. Like JSON, BSON supports the embedding of documents and arrays within other documents and arrays. BSON can be compared to binary interchange formats Only Primitives No objects or list {"hello": "world"} → "x16x00x00x00x02hellox00 x06x00x00x00worldx00x00" Europython 2013 --> { "method": ”readBlock", "params": [”…"], "id": 1} <-- { "result": [..], "error": null, "id": 1} GET /mychat HTTP/1.1 Host: server.example.com Upgrade: websocket Connection: Upgrade Sec-WebSocket-Key: x3JJHMbDL1EzLkh9GBhXDw== Sec-WebSocket-Protocol: chat Sec-WebSocket-Version: 13 Origin: http://example.com HTTP/1.1 101 Switching Protocols Upgrade: websocket Connection: Upgrade Sec-WebSocket-Accept: HSmrc0sMlYUkAGmm5OPpG2HaGWk= Sec-WebSocket-Protocol: chat
    34. 34. Beolink.org 34 RestFS Protocol Meta Operation - Bucket - Object id - Operation - List elements Operation Packets Collect operation to single segment Parallel  Single channel to meta data server  Parallel channel to block storage (one per segment) Europython 2013
    35. 35. Beolink.org 35 Locks Europython 2013
    36. 36. Beolink.org 36 Locks vs No consistency Europython 2013
    37. 37. Beolink.org 37 Locks Europython 2013 OpLocks Time base Token base Ordering Conflict are management with the serial property
    38. 38. Beolink.org 38 Cache Europython 2013
    39. 39. Beolink.org 39 Cache Publish–subscribe “… is a messaging pattern where senders of messages, called publishers, do not program the messages to be sent directly to specific receivers, called subscribers. Published messages are characterized into classes, without knowledge of what, if any, subscribers there may be. Subscribers express interest in one or more classes, and only receive messages that are of interest, without knowledge of what, if any, publishers there are… “ Wikipedia Pattern matching Clients may subscribe to glob-style patterns in order to receive all the messages sent to channel names matching a given pattern. Distributed Cache Server Side For server side the server share information over distributed cache to reduce the use of backend Client Cache Pre allocated block with circular cache write-through cache Europython 2013 Demo http://www.websocket.org/echo.html Use case A: 1,000 Use case B: 10,000 Use case C: 100,000
    40. 40. Beolink.org 40 Block Storage Europython 2013
    41. 41. Beolink.org 41 Backend: Storage Kademlia's XOR distance is easier to calculate. Kademlia's routing tables makes routing table management a bit easier. Each node in the network keeps contact information for only log n other nodes Kademlia implements a "least recently seen" eviction policy, removing contacts that have not been heard from for the longest period of time. Key/value pair is stored on the node whose 160-bit nodeID is closest to the key Closest node, send a copy to neighbor Europython 2013
    42. 42. Beolink.org 42 Code Europython 2013
    43. 43. Beolink.org 43 Pluggable Europython 2013 Protocol • Connection Handler • Data transcoding Service • High level Operations across multiple functions (like locking) • Integrity operations/transaction Manager • Operations handler for specific area (ex. metadata) • Split info in sub info Driver • Read and write operation to storage system, agnostic operation
    44. 44. Beolink.org 44 NoSQL as much as Possible Key Value - Key in memory - Value on disc Example of benchmark result The test was done with 50 simultaneous clients performing 100000 requests. The value SET and GET is a 256 bytes string. The Linux box is running Linux 2.6, it's Xeon X3320 2.5 GHz. Text executed using the loopback interface (127.0.0.1). Connections Transaction Cluster Multi-master Auto recovery Europython 2013
    45. 45. Beolink.org 45 What we are using Module Software Storage Filesystem, DHT (kademlia, Pastry*) Metadata SQL(mysql,sqlite), Nosql (Redis) Auth Oauth(google, twitter, facebook), kerberos*, internal Protocol Websocket Message Format JSON-RPC 2.0, Amazon S3 Encoding Plain, bson CallBack Subscribe/Publish Websocket/Redis, Async I/O TornadoWeb, ZeroMQ* HASH Sha-XXX, MD5-XXX, AES Encryptio n SSL, ciphers supported by crypto++ Discovery DNS, file base* are planned Europython 2013
    46. 46. Beolink.orgWhat is it good for ? 46 User • Home directory • Remote/Internet disks Application • Object storage • Shared space • Virtual Machine Distribution • CDN (Multimedia) • Data replication • Disaster Recovery Europython 2013
    47. 47. Beolink.orgAdvantages 47 High reliability Distributed Decentralized Data replication Nearly unlimited scalability Horizontal scalability Multi tier scalability Cost- efficient Cheap HW Optimized resource usage Flexible User Property Extended values and info Enhanced security Extended ACL OAUTH / Federation Encryption Token for single device Simple to Extend Plugin Bricks Europython 2013
    48. 48. Beolink.orgRoadmap 48  0.1 Single server on storage (No DHT) S3 Interface Federated Authentication  0.2 Release (coming soon) DHT on storage Storage Encryption and compression FUSE  0.3 Release TBD (codename WorstFS++) Deduplication pub/sub ACL …  Next Disconnected operation, Logging, Locks, Dlocks, Bucket automate provisioning, Distribution algorithms, Load balancing, samba module, more async i/o, block replication control, negative cache, index, user defined index Europython 2013
    49. 49. Beolink.orgSupport 49 Europython 2013
    50. 50. Beolink.org Thank you http://restfs.beolink.org manfred.furuholmen@gmail.com fege85@gmail.com
    51. 51. Beolink.org 51 Backend: Storage Transport Layer ZeroMQ Storage Compressed DAta Europython 2013

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