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A Gentle Introduction to OpenSplice DDS
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Angelo Corsaro
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This presentation provides a primer into the DDS standard and OpenSplice DDS.
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A Gentle Introduction to OpenSplice DDS
1.
OpenSplice DDS
Delivering Performance, Openness, and Freedom Angelo Corsaro, Ph.D. Chief Technology Officer A Gentle Introduction OMG DDS SIG Co-Chair angelo.corsaro@prismtech.com
2.
OpenSplice DDS Delivering Performance,
Openness, and Freedom “Historical” Perspective
3.
Addressing Data Distribution
Challenges DDS is standard designed to address the data-distribution challenges across The OMG DDS Standard a wide class of Defense and Aerospace Applications ‣ Introduced in 2004 to address the Data Distribution challenges faced by a wide class of Defense and Aerospace Applications ‣ Key requirement for the standard were its ability to deliver very high performance while seamlessly scaling from embedded to ultra- large-scale deployments ‣ Today recommended by key administration worldwide and widely adopted across several different application domains, such as, Automated Trading, Simulations, SCADA, Telemetry, etc. © 2009, PrismTech. All Rights Reserved
4.
The OMG Data
Distribution Service (DDS) DDS v1.2 API Standard ‣ Language Independent, OS and HW architecture Application independent Object/Relational Mapping ‣ DCPS. Standard API for Data-Centric, Topic- Data Local Reconstruction Layer (DLRL) Based, Real-Time Publish/Subscribe Content ‣ Ownership Durability DLRL. Standard API for creating Object Views out Subscription of collection of Topics Minimum Profile Data Centric Publish/Subscribe (DCPS) DDSI/RTPS v2.1 Wire Protocol Standard ‣ Standard wire protocol allowing interoperability Real-Time Publish/Subscribe Protocol DDS Interoperability Wire Protocol between different implementations of the DDS standard UDP/IP ‣ Interoperability demonstrated among key DDS vendors in March 2009 © 2009, PrismTech. All Rights Reserved
5.
DDS!Recommendations is churning…
The infrastructure evolution cycle – New -> Emerging -> Standard -> Commodity Increasingly Mandated/Recommended by Administrations – Middleware is emerging as OS declines ! …DDS is maturing… ‣ US Navy: Open Architecture – OMG focus – Wire spec Proprietary Information - Distribution without Expressed Written Permission is Prohibited. ‣ DISR/DISA: Net-centric Systems – Tools – Enterprise integration – Multiple products fielded ‣ EuroControl:– Deployed applications! Air Traffic Control Center Operational Interoperability ! …and adoption is on the rise – Navy – DISR ‣ QinetiQ: Recommending DDS for VSI – FCS/SoSCOE © 2009, PrismTech. All Rights Reserved
6.
OpenSplice DDS Delivering Performance,
Openness, and Freedom As Simple as it Gets
7.
As Simple as
it Gets ‣ DDS is based around the concept of a fully distributed Global Data Space (GDS) Global Data Space DDS © 2009, PrismTech. All Rights Reserved
8.
As Simple as
it Gets ‣ DDS is based around the concept of a fully distributed Global Data Space (GDS) ‣ Publishers and Subscribers can join and leave the GDS at any time Global Data Space DDS © 2009, PrismTech. All Rights Reserved
9.
As Simple as
it Gets ‣ DDS is based around the concept of a fully distributed Global Data Publisher Subscriber Space (GDS) ‣ Publishers and Subscribers can join and leave the GDS at any time Subscriber Publisher Global Data Space Publisher Subscriber DDS © 2009, PrismTech. All Rights Reserved
10.
As Simple as
it Gets ‣ DDS is based around the concept of a fully distributed Global Data Publisher Subscriber Space (GDS) ‣ Publishers and Subscribers can join and leave the GDS at any time Subscriber ‣ Publishers and Subscribers Publisher Global Data Space express their intent to produce/ consume specific type of data, e.g., Topics Publisher Subscriber DDS © 2009, PrismTech. All Rights Reserved
11.
As Simple as
it Gets ‣ DDS is based around the concept of a fully distributed Global Data Publisher Subscriber Space (GDS) ‣ Publishers and Subscribers can join and leave the GDS at any time Subscriber ‣ Publishers and Subscribers Publisher Global Data Space express their intent to produce/ consume specific type of data, e.g., Topics Publisher Subscriber DDS © 2009, PrismTech. All Rights Reserved
12.
As Simple as
it Gets ‣ DDS is based around the concept of a fully distributed Global Data Publisher Subscriber Space (GDS) ‣ Publishers and Subscribers can join and leave the GDS at any time Subscriber ‣ Publishers and Subscribers Publisher Global Data Space express their intent to produce/ consume specific type of data, e.g., Topics Subscriber ‣ Data flows from Publisher to Publisher Subscribers DDS © 2009, PrismTech. All Rights Reserved
13.
As Simple as
it Gets ‣ DDS is based around the concept of a fully distributed Global Data Publisher Subscriber Space (GDS) ‣ Publishers and Subscribers can join and leave the GDS at any time Subscriber ‣ Publishers and Subscribers Publisher Global Data Space express their intent to produce/ consume specific type of data, e.g., Topics Subscriber ‣ Data flows from Publisher to Publisher Subscribers DDS © 2009, PrismTech. All Rights Reserved
14.
OpenSplice DDS Delivering Performance,
Openness, and Freedom Defining Data
15.
DDS Topics
{Circle, Square, Triangle} Topic ‣ Unit of information exchanged between Publisher and Subscribers. ‣ An association between a unique name, a type and a QoS setting {ShapeType} {...} Topic Type. struct ShapeType { ‣ Type describing the data associated with one long x; or more Topics long y; ‣ A Topic type can have a key represented by an long shapesize; string color; arbitrary number of attributes }; ‣ Expressed in IDL #pragma keylist ShapeType color © 2009, PrismTech. All Rights Reserved
16.
DDS Topics
Circle struct ShapeType { long x; long y; long shapesize; Topic QoS string color; }; #pragma keylist ShapeType color © 2009, PrismTech. All Rights Reserved
17.
DDS Topics
Triangle struct ShapeType { long x; long y; long shapesize; Topic QoS string color; }; #pragma keylist ShapeType color © 2009, PrismTech. All Rights Reserved
18.
DDS Topic Instances
and Samples Topic Instances ‣ Each key value identifies a unique Topic Instance, ‣ Topic’s instance lifetime can be explicitly managed in DDS Topic Samples ‣ The values assumed by a Topic Instance over time are referred as Instance Sample struct ShapeType { long x; long y; long shapesize; string color; }; #pragma keylist ShapeType color © 2009, PrismTech. All Rights Reserved
19.
Topic/Instances/Samples Recap.
Topics Instances Samples ti tj tnow time © 2009, PrismTech. All Rights Reserved
20.
Content Filtering
X0 X1 X0 <= X <= X1 ‣ DDS allows to specify content- filtered Topics for which a subset of SQL92 is used to express the filter condition Y0 ‣ Content filters can be applied on the entire content of the Topic Type Y0 <= Y <= Y1 ‣ Content filters are applied by DDS Y1 each time a new sample is produced/delivered © 2009, PrismTech. All Rights Reserved
21.
Filtering Market Data
AAPL < $157 | | AAPL > $162 MSFT > $35 Apple 164.0 Microsoft 40 161.5 30 159.0 20 156.5 10 154.0 0 AAPL MSFT ‣ DDS continuous queries can be used for filtering the stream of data produced for a specific stock symbol. © 2009, PrismTech. All Rights Reserved
22.
Local Queries ‣ Subscribed
Topics can be seen locally as “Tables” ‣ A subset of SQL92 can be used for performing queries on X0 multiple topics as well as natural joins ‣ Queries are Circle Topic performed under Y0 color x y shapesize Y0 user control and red 57 62 50 provide a result that blue 90 85 50 Y0 <= Y <= Y1 depends on the yellow 30 25 50 current snapshot of SELECT * FROM ShapeType s WHERE s.x > 25 AND s.y < 55 Y1 the system, e.g., samples currently color x y shapesize available yellow 30 25 50 © 2009, PrismTech. All Rights Reserved
23.
OpenSplice DDS Delivering Performance,
Openness, and Freedom Organizing Data
24.
DDS Partitions ‣ All
DDS communication is Domain Partition happens within a Domain ‣ Domain can divided into Publisher Subscriber Partitions B ‣ Topics are published and m subscribed across on or A F Subscriber more Partitions Publisher J D C K E Publisher Subscriber © 2009, PrismTech. All Rights Reserved
25.
OpenSplice Network Partitions ‣
OpenSplice DDS allows to Publisher Subscriber define network partitions along "Red" B with DDS partitions m ‣ Network partitions are bound to A F a list of unicast/multicast Publisher J "Green" Subscriber network addresses D C ‣ Partition.Topic combination can K E "Yellow" be mapped into OpenSplice DDS Network Partitions Publisher Subscriber ‣ Wildcards can be used when defining the mapping, and in Yellow.* => 224.1.1.1 Green.* => 224.1.1.2 case of multiple matches Green.E => 224.1.1.3 OpenSplice DDS will always consider the best match © 2009, PrismTech. All Rights Reserved
26.
OpenSplice DDS Delivering Performance,
Openness, and Freedom Quality of Service
27.
Anatomy of a
DDS Application Topic Topic Topic Samples Samples Instances Samples Instances Instances 121 62 1 21 62 1 22 62 1 22 62 1 23 63 1 23 63 DataReader DataReader 1 21 62 2 20 61 1 22 62 2 19 60 1 23 63 DataReader DataReader 2 20 61 2 20 61 2 19 60 2 19 60 DataWriter DataWriter DataReader DataReader 3 25 70 3 25 71 25 3 25 74 3 26 77 3 26 77 DataWriter DataWriter 3 25 70 3 25 71 25 3 25 74 struct TempSensor { 3 25 70 3 25 71 25 3 25 74 3 26 77 int tID; float temp; float humidity; }; #pragma keylist TempSensor tID © 2009, PrismTech. All Rights Reserved
28.
Anatomy of a
DDS Application Topic Topic Topic Samples Samples Instances Samples Instances Instances 121 62 1 21 62 1 22 62 1 22 62 1 23 63 1 23 63 DataReader DataReader 1 21 62 2 20 61 1 22 62 2 19 60 1 23 63 DataReader DataReader 2 20 61 2 20 61 2 19 60 2 19 60 DataWriter DataWriter DataReader DataReader 3 25 70 3 25 71 25 3 25 74 3 26 77 3 26 77 DataWriter DataWriter 3 25 70 3 25 71 25 3 25 74 struct TempSensor { 3 25 70 3 25 71 25 3 25 74 3 26 77 int tID; float temp; Arrows }; float humidity; show #pragma keylist TempSensor tID structural relationship s, not data- Subscriber Publisher flows Partition © 2009, PrismTech. All Rights Reserved
29.
Anatomy of a
DDS Application Topic Topic Topic Samples Samples Instances Samples Instances Instances 121 62 1 21 62 1 22 62 1 22 62 1 23 63 1 23 63 DataReader DataReader 1 21 62 2 20 61 1 22 62 2 19 60 1 23 63 DataReader DataReader 2 20 61 2 20 61 2 19 60 2 19 60 DataWriter DataWriter DataReader DataReader 3 25 70 3 25 71 25 3 25 74 3 26 77 3 26 77 DataWriter DataWriter 3 25 70 3 25 71 25 3 25 74 struct TempSensor { 3 25 70 3 25 71 25 3 25 74 3 26 77 int tID; float temp; Arrows }; float humidity; show #pragma keylist TempSensor tID structural relationship s, not data- Subscriber Publisher flows Partition Domain Participant Domain © 2009, PrismTech. All Rights Reserved
30.
QoS Model ‣ QoS-Policies
are used to control relevant properties of OpenSplice DDS entities, Type Matching QoS matching such as: QoS QoS QoS QoS QoS QoS QoS ‣ Temporal Properties ‣ Priority Topic Name Publisher Subscriber ‣ Durability ... DataWriter writes Type reads DataReader ... ... ‣ Availability DomainParticipant writes Type reads DataReader DomainParticipant DataWriter ‣ ... Name ‣ Some QoS-Policies are matched based on Topic QoS QoS QoS a Request vs. Offered Model thus QoS- enforcement ‣ Publications and Subscriptions match only if the declared vs. requested QoS are compatible ‣ e.g., it is not possible to match a publisher which delivers data unreliably with a subscriber which requires reliability © 2009, PrismTech. All Rights Reserved
31.
QoS Policies QoS Policy
Applicability RxO Modifiable Type Matching QoS matching DURABILITY T, DR, DW Y N Data Availability QoS QoS QoS QoS QoS QoS QoS DURABILITY SERVICE T, DW N N Topic Name Publisher Subscriber LIFESPAN T, DW - Y ... DataWriter writes Type reads DataReader ... T, DR, DW N N ... HISTORY DomainParticipant DataWriter writes Type reads DataReader DomainParticipant PRESENTATION P, S Y N Data Delivery Name Topic RELIABILITY T, DR, DW Y N PARTITION P, S N Y QoS QoS QoS DESTINATION ORDER T, DR, DW Y N OWNERSHIP T, DR, DW Y N ‣ Rich set of QoS allow to configure OWNERSHIP DW - Y STRENGTH several different aspects of data DEADLINE T, DR, DW Y Y Data Timeliness availability, delivery and timeliness LATENCY BUDGET T, DR, DW Y Y TRANSPORT PRIORITY T, DW - Y ‣ QoS can be used to control and optimize network as well as TIME BASED FILTER DR - Y Resources computing resource RESOURCE LIMITS T, DR, DW N N USER_DATA DP, DR, DW N Y Configuration TOPIC_DATA T N Y GROUP_DATA P, S N Y © 2009, PrismTech. All Rights Reserved
32.
Mapping QoS
Which properties does QoS controls? TimeBasedFilter Deadline Data Throughput Latency LatencyBudget TransportPriority Proprietary Information - Distribution without Expressed Written Permission is Prohibited. Control over Latency/Throughput tradeoff Control over data latency Control over data priority © 2009, PrismTech. All Rights Reserved
33.
Mapping QoS
Which properties does QoS controls? TimeBasedFilter Deadline History Data Data Throughput Lifespan Durability Latency Availability Ownership LatencyBudget TransportPriority Ownership Strength Proprietary Information - Distribution without Expressed Written Permission is Prohibited. Control over Latency/Throughput tradeoff Control over data queueing Control over data latency Control over data persistency Control over data priority Control over data sources hot-swap © 2009, PrismTech. All Rights Reserved
34.
Mapping QoS
Which properties does QoS controls? TimeBasedFilter Deadline History Data Data Throughput Lifespan Durability Latency Availability Ownership LatencyBudget TransportPriority Ownership Strength Proprietary Information - Distribution without Expressed Written Permission is Prohibited. Control over Latency/Throughput tradeoff Control over data queueing Control over data latency Control over data persistency Control over data priority Control over data sources hot-swap Reliability OpenSplice DDS provides programmatic Destination QoS-driven support for configuring the most Presentation Data Delivery Order important properties of data distribution! Control over data distribution reliability Control over data ordering Control over presentation © 2009, PrismTech. All Rights Reserved
35.
Reliability The reliability with
which data is delivered to applications is impacted in DDS by the following qualities of service ‣ RELIABILITY ‣ BEST_EFORT ‣ RELIABLE ‣ HISTORY ‣ KEEP_LAST (K) ‣ KEEP_ALL ‣ Theoretically, the only way to assure that an application will see all the samples produced by a writer is to use RELIABLE+KEEP_ALL. Any other combination could induce to samples being discarded on the receiving side because of the HISTORY depth © 2009, PrismTech. All Rights Reserved
36.
Real-Time The real-time properties
with which data is delivered to applications is impacted in DDS by the following qualities of service: ‣ TRANSPORT_PRIORITY Publisher Deadline Deadline Deadline Deadline Deadline Subscriber ‣ LATENCY_BUDGET Deadline Violation ‣ In addition, DDS provides means for detecting performance failure, e.g., Deadline miss, by means of the DEADLINE QoS ‣ Given a periodic task-set {T} with periods Di (with Di < Di+1) and deadline equal to the period, than QoS should be set as follows: ‣ Assign to each task Ti a TRANSPORT_PRIORITY Pi such that Pi > Pi+1 ‣ Set for each task Ti a DEADLINE QoS of Di ‣ For maximizing throughput and minimizing resource usage set for each Ti a LATENCY_BUDGET QoS between Di /2 and Di/3 (this is a rule of thumb, the upper bound is Di-(RTT/2)) © 2009, PrismTech. All Rights Reserved
37.
High Availability ‣ A
Topic can have Shared or Exclusive Ownership ‣ Exclusively owned Topics can be modified by a single writer ‣ Writer strength is used to coordinate replicated writers Proprietary Information - Distribution without Expressed Written Permission is Prohibited. StockQuote symbol: "MSFT" StockQuote StockQuote name: "Microsoft Corp." StockQuote symbol: "GOOG" symbol: "GOOG" exchange: "NASD""GOOG" symbol: name: "Google Inc." quote: 33.73 name: "Google Inc." name: "Google Inc." exchange: "NASD" exchange: "NASD" exchange: "NASD" StockQuote StockQuote StockQuote quote: 663.97 W1 quote: 663.97"AAPL" symbol: "AAPL" quote: 663.97 symbol: "AAPL" symbol: name: "Apple Inc." name: "Apple Inc." name: "Apple Inc." exchange: "NASD" exchange: "NASD" exchange: "NASD" R1 quote: 165.37 quote: 165.37 quote: 165.37 STRENGTH=3 StockQuote symbol: "AAPL" StockQuote Inc." name: "Apple symbol: "GOOG""NASD" exchange: name: quote: 165.37 "Google Inc." StockQuote "NASD" exchange: symbol: "MSFT" quote: 663.97 name: "Microsoft Corp." exchange: "NASD" quote: 33.73 W1’ R2 STRENGTH=2 StockQuote symbol: "AAPL" StockQuote Inc." name: "Apple symbol: "GOOG""NASD" exchange: name: quote: 165.37 "Google Inc." StockQuote "NASD" exchange: symbol: "MSFT" quote: 663.97 name: "Microsoft Corp." exchange: "NASD" quote: 33.73 W2’’ R3 STRENGTH=1 © 2009, PrismTech. All Rights Reserved
38.
High Availability ‣ A
Topic can have Shared or Exclusive Ownership ‣ Exclusively owned Topics can be modified by a single writer ‣ Writer strength is used to coordinate replicated writers Proprietary Information - Distribution without Expressed Written Permission is Prohibited. StockQuote symbol: "MSFT" StockQuote StockQuote name: "Microsoft Corp." StockQuote symbol: "GOOG" symbol: "GOOG" exchange: "NASD""GOOG" symbol: name: "Google Inc." quote: 33.73 name: "Google Inc." name: "Google Inc." exchange: "NASD" exchange: "NASD" exchange: "NASD" quote: 663.97 W1 quote: 663.97 quote: 663.97 StockQuote symbol: "AAPL" R1 STRENGTH=3 name: "Apple Inc." exchange: "NASD" quote: 165.37 StockQuote symbol: "GOOG" name: "Google Inc." StockQuote "NASD" exchange: symbol: "MSFT" quote: 663.97 name: "Microsoft Corp." exchange: "NASD" quote: 33.73 W1’ R2 StockQuote symbol: "AAPL" name: "Apple Inc." exchange: "NASD" STRENGTH=2 quote: 165.37 StockQuote symbol: "GOOG" name: "Google Inc." StockQuote "NASD" exchange: symbol: "MSFT" quote: 663.97 name: "Microsoft Corp." exchange: "NASD" quote: 33.73 W2’’ StockQuote symbol: "AAPL" name: "Apple Inc." exchange: "NASD" quote: 165.37 R3 STRENGTH=1 © 2009, PrismTech. All Rights Reserved
39.
High Availability ‣ A
Topic can have Shared or Exclusive Ownership ‣ Exclusively owned Topics can be modified by a single writer ‣ Writer strength is used to coordinate replicated writers Proprietary Information - Distribution without Expressed Written Permission is Prohibited. StockQuote symbol: "MSFT" name: "Microsoft Corp." exchange: "NASD" quote: 33.73 W1 StockQuote symbol: "AAPL" R1 STRENGTH=3 name: "Apple Inc." exchange: "NASD" quote: 165.37 StockQuote symbol: "GOOG" name: "Google Inc." exchange: "NASD" quote: 663.97 StockQuote symbol: "MSFT" name: "Microsoft Corp." exchange: "NASD" quote: 33.73 StockQuote W1’ R2 symbol: "GOOG" name: "Google Inc." exchange: "NASD" quote: 663.97 StockQuote symbol: "AAPL" name: "Apple Inc." exchange: "NASD" STRENGTH=2 quote: 165.37 StockQuote symbol: "MSFT" name: "Microsoft Corp." exchange: "NASD" StockQuote quote: 33.73 symbol: "GOOG" R3 name: "Google Inc." W2’’ exchange: "NASD"StockQuote quote: 663.97symbol: "AAPL" name: "Apple Inc." exchange: "NASD" quote: 165.37 STRENGTH=1 © 2009, PrismTech. All Rights Reserved
40.
High Availability ‣ A
Topic can have Shared or Exclusive Ownership ‣ Exclusively owned Topics can be modified by a single writer ‣ Writer strength is used to coordinate replicated writers Proprietary Information - Distribution without Expressed Written Permission is Prohibited. StockQuote R1 symbol: "AAPL" name: "Apple Inc." exchange: "NASD" quote: 165.37 StockQuote symbol: "GOOG" name: "Google Inc." exchange: "NASD" quote: 663.97 StockQuote symbol: "GOOG" name: "Google Inc." exchange: "NASD" quote: 663.97 StockQuote symbol: "AAPL" name: "Apple Inc." exchange: "NASD" R2 quote: 165.37 StockQuote StockQuote StockQuote StockQuote symbol: "MSFT" symbol: "MSFT" symbol: "MSFT" symbol: "GOOG" name: "Microsoft Corp." name: "Microsoft Corp." name: "Microsoft Corp." exchange: "NASD" exchange: "NASD" name: "Google Inc." exchange: "NASD" quote: 33.73 quote: 33.73 quote: 33.73 exchange: "NASD" quote: 663.97 StockQuote R3 symbol: "AAPL" W2’’ name: "Apple Inc." exchange: "NASD" quote: 165.37 STRENGTH=1 © 2009, PrismTech. All Rights Reserved
41.
High Availability ‣ A
Topic can have Shared or Exclusive Ownership ‣ Exclusively owned Topics can be modified by a single writer ‣ Writer strength is used to coordinate replicated writers Proprietary Information - Distribution without Expressed Written Permission is Prohibited. StockQuote R1 symbol: "AAPL" name: "Apple Inc." exchange: "NASD" StockQuote quote: 165.37 symbol: "MSFT" name: "Microsoft Corp." exchange: "NASD" quote: 33.73 StockQuote symbol: "GOOG" name: "Google Inc." exchange: "NASD" quote: 663.97 StockQuote symbol: "GOOG" name: "Google Inc." exchange: "NASD" quote: 663.97 StockQuote R2 symbol: "MSFT" name: "Microsoft Corp." StockQuote exchange: "NASD" quote: 33.73 symbol: "AAPL" name: "Apple Inc." exchange: "NASD" quote: 165.37 StockQuote symbol: "GOOG" name: "Google Inc." StockQuote exchange: "NASD" symbol: "MSFT" quote: 663.97 name: "Microsoft Corp." exchange: "NASD" quote: 33.73 StockQuote R3 symbol: "AAPL" W2’’ name: "Apple Inc." exchange: "NASD" quote: 165.37 STRENGTH=1 © 2009, PrismTech. All Rights Reserved
42.
Eventual Consistency &
R/W Caches DataReader DataReader 1 1 2 1 DataWriter 1 1 3 1 Proprietary Information - Distribution without Expressed Written Permission is Prohibited. 2 1 1 2 Topic DataReader 1 2 2 3 3 1 DataReader Cache 2 2 2 3 3 1 Topic 1 1 DataReader Cache 2 Topic 1 DDS DataWriter Cache 3 1 Topic DataReader Cache Under an Eventual Consistency Model, DDS guarantees that all matched Reader Caches will eventually be identical of the respective Writer Cache © 2009, PrismTech. All Rights Reserved
43.
QoS Impacting the
Consistency Model The DDS Consistency Model is a property that can be associated to Topics or further refined by Reader/Writers. The property is controlled by the following QoS Policies: ‣ DURABILITY ‣ VOLATILE | TRANSIENT_LOCAL | TRANSIENT | PERSISTENT ‣ LIFESPAN Proprietary Information - Distribution without Expressed Written Permission is Prohibited. ‣ RELIABILITY ‣ RELIABLE | BEST_EFFORT ‣ DESTINATION ORDER ‣ SOURCE_TIMESTAMP | DESTINATION_TIMESTAMP QoS Policy Applicability RxO Modifiable DURABILITY T, DR, DW Y N LIFESPAN T, DW - Y RELIABILITY T, DR, DW Y N DESTINATION ORDER T, DR, DW Y N © 2009, PrismTech. All Rights Reserved
44.
QoS Impacting the
Consistency Model DURABILITY RELIABILITY DESTINATION_ORDER LIFESPAN Eventual Consistency VOLATILE RELIABLE SOURCE_TIMESTAMP INF. (No Crash / Recovery) Eventual Consistency TRANSIENT_LOCAL RELIABLE SOURCE_TIMESTAMP INF. Proprietary Information - Distribution without Expressed Written Permission is Prohibited. (Reader Crash / Recovery) Eventual Consistency TRANSIENT RELIABLE SOURCE_TIMESTAMP INF. (Crash/Recovery) Eventual Consistency PERSISTENT RELIABLE SOURCE_TIMESTAMP INF. (Crash/Recovery) Weak Consistency ANY ANY DESTINATION_TIMESTAMP ANY Weak Consistency ANY BEST_EFFORT ANY ANY Weak Consistency ANY ANY ANY N © 2009, PrismTech. All Rights Reserved
45.
Eventual Consistency @
Work DURABILITY RELIABILITY DESTINATION_ORDER LIFESPAN Eventual Consistency (Reader TRANSIENT_LOCAL RELIABLE SOURCE_TIMESTAMP INF. Crash / Recovery) {A} Eventual Consistency TRANSIENT RELIABLE SOURCE_TIMESTAMP INF. {B} (Crash/Recovery) Weak Consistency ANY ANY ANY N {J} Proprietary Information - Distribution without Expressed Written Permission is Prohibited. S = {A, D} S1 P = {A, B} B P1 m A F J D C P = {D, C, J} P2 K E S = {A} S4 © 2009, PrismTech. All Rights Reserved
46.
Eventual Consistency @
Work DURABILITY RELIABILITY DESTINATION_ORDER LIFESPAN Eventual Consistency (Reader TRANSIENT_LOCAL RELIABLE SOURCE_TIMESTAMP INF. Crash / Recovery) {A} Eventual Consistency TRANSIENT RELIABLE SOURCE_TIMESTAMP INF. {B} (Crash/Recovery) Weak Consistency ANY ANY ANY N {J} Proprietary Information - Distribution without Expressed Written Permission is Prohibited. S = {A, D} S1 P = {A, B} B P1 m A A F J D C P = {D, C, J} P2 K E S = {A} S4 © 2009, PrismTech. All Rights Reserved
47.
Eventual Consistency @
Work DURABILITY RELIABILITY DESTINATION_ORDER LIFESPAN Eventual Consistency (Reader TRANSIENT_LOCAL RELIABLE SOURCE_TIMESTAMP INF. Crash / Recovery) {A} Eventual Consistency TRANSIENT RELIABLE SOURCE_TIMESTAMP INF. {B} (Crash/Recovery) Weak Consistency ANY ANY ANY N {J} Proprietary Information - Distribution without Expressed Written Permission is Prohibited. S = {A, D} S1 P = {A, B} B A P1 m A A F J D C P = {D, C, J} P2 K E S = {A} S4 © 2009, PrismTech. All Rights Reserved A
48.
Eventual Consistency @
Work DURABILITY RELIABILITY DESTINATION_ORDER LIFESPAN Eventual Consistency (Reader TRANSIENT_LOCAL RELIABLE SOURCE_TIMESTAMP INF. Crash / Recovery) {A} Eventual Consistency TRANSIENT RELIABLE SOURCE_TIMESTAMP INF. {B} (Crash/Recovery) Weak Consistency ANY ANY ANY N {J} Proprietary Information - Distribution without Expressed Written Permission is Prohibited. S = {A, D} S1 P = {A, B} B A P1 m B A A F J D C P = {D, C, J} P2 K E S = {A} S4 © 2009, PrismTech. All Rights Reserved A
49.
Eventual Consistency @
Work DURABILITY RELIABILITY DESTINATION_ORDER LIFESPAN Eventual Consistency (Reader TRANSIENT_LOCAL RELIABLE SOURCE_TIMESTAMP INF. Crash / Recovery) {A} Eventual Consistency TRANSIENT RELIABLE SOURCE_TIMESTAMP INF. {B} (Crash/Recovery) Weak Consistency ANY ANY ANY N {J} Proprietary Information - Distribution without Expressed Written Permission is Prohibited. S = {A, D} S1 P = {A, B} B B A P1 m A A F J D C P = {D, C, J} P2 K E S = {A} S4 © 2009, PrismTech. All Rights Reserved A
50.
Eventual Consistency @
Work DURABILITY RELIABILITY DESTINATION_ORDER LIFESPAN Eventual Consistency (Reader TRANSIENT_LOCAL RELIABLE SOURCE_TIMESTAMP INF. Crash / Recovery) {A} Eventual Consistency TRANSIENT RELIABLE SOURCE_TIMESTAMP INF. {B} (Crash/Recovery) Weak Consistency ANY ANY ANY N {J} Proprietary Information - Distribution without Expressed Written Permission is Prohibited. S = {A, D} S1 P = {A, B} B B A P1 m S= {A, B, J} A A F S2 J D C P = {D, C, J} P2 K E S = {A} S4 © 2009, PrismTech. All Rights Reserved A
51.
Eventual Consistency @
Work DURABILITY RELIABILITY DESTINATION_ORDER LIFESPAN Eventual Consistency (Reader TRANSIENT_LOCAL RELIABLE SOURCE_TIMESTAMP INF. Crash / Recovery) {A} Eventual Consistency TRANSIENT RELIABLE SOURCE_TIMESTAMP INF. {B} (Crash/Recovery) Weak Consistency ANY ANY ANY N {J} Proprietary Information - Distribution without Expressed Written Permission is Prohibited. S = {A, D} S1 P = {A, B} B B A P1 m S= {A, B, J} A A F S2 J D C BA P = {D, C, J} P2 K E S = {A} S4 © 2009, PrismTech. All Rights Reserved A
52.
Eventual Consistency @
Work DURABILITY RELIABILITY DESTINATION_ORDER LIFESPAN Eventual Consistency (Reader TRANSIENT_LOCAL RELIABLE SOURCE_TIMESTAMP INF. Crash / Recovery) {A} Eventual Consistency TRANSIENT RELIABLE SOURCE_TIMESTAMP INF. {B} (Crash/Recovery) Weak Consistency ANY ANY ANY N {J} Proprietary Information - Distribution without Expressed Written Permission is Prohibited. S = {A, D} S1 B B A m S= {A, B, J} A F S2 J D C BA P = {D, C, J} P2 K E S = {A} S4 © 2009, PrismTech. All Rights Reserved A
53.
Eventual Consistency @
Work DURABILITY RELIABILITY DESTINATION_ORDER LIFESPAN Eventual Consistency (Reader TRANSIENT_LOCAL RELIABLE SOURCE_TIMESTAMP INF. Crash / Recovery) {A} Eventual Consistency TRANSIENT RELIABLE SOURCE_TIMESTAMP INF. {B} (Crash/Recovery) Weak Consistency ANY ANY ANY N {J} Proprietary Information - Distribution without Expressed Written Permission is Prohibited. S = {A, D} S1 B B A m S= {A, B, J} A F S2 J D C BA P = {D, C, J} S= {A, B, D, J} P2 K E S3 S = {A} S4 © 2009, PrismTech. All Rights Reserved A
54.
Eventual Consistency @
Work DURABILITY RELIABILITY DESTINATION_ORDER LIFESPAN Eventual Consistency (Reader TRANSIENT_LOCAL RELIABLE SOURCE_TIMESTAMP INF. Crash / Recovery) {A} Eventual Consistency TRANSIENT RELIABLE SOURCE_TIMESTAMP INF. {B} (Crash/Recovery) Weak Consistency ANY ANY ANY N {J} Proprietary Information - Distribution without Expressed Written Permission is Prohibited. S = {A, D} S1 B B A m S= {A, B, J} A F S2 J J D D C BA P = {D, C, J} S= {A, B, D, J} P2 K E S3 S = {A} JB S4 © 2009, PrismTech. All Rights Reserved A
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