X-Git-Url: http://lists.indexdata.dk/cgi-bin?a=blobdiff_plain;f=doc%2Fbook.xml;h=9f96d75a39d3f3fdad14e70eb20d3451c304428d;hb=72d323b0b9aaaa1a5fb06afe8239c9a962b33bac;hp=cd0132521d0e2ff555f671351c982a680f03cb3c;hpb=877cbc671edbea1784f9b075a38345059935355d;p=pazpar2-moved-to-github.git
diff --git a/doc/book.xml b/doc/book.xml
index cd01325..9f96d75 100644
--- a/doc/book.xml
+++ b/doc/book.xml
@@ -1,6 +1,6 @@
-
%local;
@@ -24,6 +24,12 @@
JakubSkoczen
+
+ MikeTaylor
+
+
+ DennisSchafroth
+
&version;
©right-year;
@@ -31,10 +37,12 @@
- Pazpar2 is a high-performance, user interface-independent, data
- model-independent metasearching
- middle-ware featuring merging, relevance ranking, record sorting,
+ Pazpar2 is a high-performance metasearch engine featuring
+ merging, relevance ranking, record sorting,
and faceted results.
+ It is middleware: it has no user interface of its own, but can be
+ configured and controlled by an XML-over-HTTP web-service to provide
+ metasearching functionality behind any user interface.
This document is a guide and reference to Pazpar2 version &version;.
@@ -43,145 +51,172 @@
-
-
-
-
-
+
+
+
+
+
Introduction
-
- Pazpar2 is a stand-alone metasearch client with a web-service API, designed
- to be used either from a browser-based client (JavaScript, Flash, Java,
- etc.), from server-side code, or any combination of the two.
- Pazpar2 is a highly optimized client designed to
- search many resources in parallel. It implements record merging,
- relevance-ranking and sorting by arbitrary data content, and facet
- analysis for browsing purposes. It is designed to be data model
- independent, and is capable of working with MARC, DublinCore, or any
- other XML-structured response format
- -- XSLT is used to normalize and extract
- data from retrieval records for display and analysis. It can be used
- against any server which supports the
- Z39.50 and SRU/SRW
- protocol. Proprietary
- backend modules can be used to support a large number of other protocols
- (please contact Index Data for further information about this).
-
-
- Additional functionality such as
- user management, attractive displays are expected to be implemented by
- applications that use Pazpar2. Pazpar2 is user interface independent.
- Its functionality is exposed through a simple REST-style web-service API,
- designed to be simple to use from an Ajax-enabled browser, Flash
- animation, Java applet, etc., or from a higher-level server-side language
- like PHP or Java. Because session information can be shared between
- browser-based logic and your server-side scripting, there is tremendous
- flexibility in how you implement your business logic on top of Pazpar2.
-
-
- Once you launch a search in Pazpar2, the operation continues behind the
- scenes. Pazpar2 connects to servers, carries out searches, and
- retrieves, deduplicates, and stores results internally. Your application
- code may periodically inquire about the status of an ongoing operation,
- and ask to see records or other result set facets. Result become
- available immediately, and it is easy to build end-user interfaces which
- feel extremely responsive, even when searching more than 100 servers
- concurrently.
-
-
- Pazpar2 is designed to be highly configurable. Incoming records are
- normalized to XML/UTF-8, and then further normalized using XSLT to a
- simple internal representation that is suitable for analysis. By
- providing XSLT stylesheets for different kinds of result records, you
- can tune Pazpar2 to work against different kinds of information
- retrieval servers. Finally, metadata is extracted, in a configurable
- way, from this internal record, to support display, merging, ranking,
- result set facets, and sorting. Pazpar2 is not bound to a specific model
- of metadata, such as DublinCore or MARC -- by providing the right
- configuration, it can work with a number of different kinds of data in
- support of many different applications.
-
-
- Pazpar2 is designed to be efficient and scalable. You can set it up to
- search several hundred targets in parallel, or you can use it to support
- hundreds of concurrent users. It is implemented with the same attention
- to performance and economy that we use in our indexing engines, so that
- you can focus on building your application, without worrying about the
- details of metasearch logic. You can devote all of your attention to
- usability and let Pazpar2 do what it does best -- metasearch.
-
-
- If you wish to connect to commercial or other databases which do not
- support open standards, please contact Index Data. We have a licensing
- agreement with a third party vendor which will enable Pazpar2 to access
- thousands of online databases, in addition the vast number of catalogs
- and online services that support the Z39.50/SRU/SRW protocols.
-
-
- Pazpar2 is our attempt to re-think the traditional paradigms for
- implementing and deploying metasearch logic, with an uncompromising
- approach to performance, and attempting to make maximum use of the
- capabilities of modern browsers. The demo user interface that
- accompanies the distribution is but one example. If you think of new
- ways of using Pazpar2, we hope you'll share them with us, and if we
- can provide assistance with regards to training, design, programming,
- integration with different backends, hosting, or support, please don't
- hesitate to contact us. If you'd like to see functionality in Pazpar2
- that is not there today, please don't hesitate to contact us. It may
- already be in our development pipeline, or there might be a
- possibility for you to help out by sponsoring development time or
- code. Either way, get in touch and we will give you straight answers.
-
-
- Enjoy!
-
-
- Pazpar2 is covered by the GNU license version 2.
- See for further information.
-
+
+
+ What Pazpar2 is
+
+ Pazpar2 is a stand-alone metasearch engine with a web-service API, designed
+ to be used either from a browser-based client (JavaScript, Flash,
+ Java applet,
+ etc.), from server-side code, or any combination of the two.
+ Pazpar2 is a highly optimized client designed to
+ search many resources in parallel. It implements record merging,
+ relevance-ranking and sorting by arbitrary data content, and facet
+ analysis for browsing purposes. It is designed to be data-model
+ independent, and is capable of working with MARC, DublinCore, or any
+ other XML-structured response format
+ -- XSLT is used to normalize and extract
+ data from retrieval records for display and analysis. It can be used
+ against any server which supports the
+ Z39.50, SRU/SRW
+ or SOLR protocol. Proprietary
+ backend modules can function as connectors between these standard
+ protocols and any non-standard API, including web-site scraping, to
+ support a large number of other protocols.
+
+
+ Additional functionality such as
+ user management and attractive displays are expected to be implemented by
+ applications that use Pazpar2. Pazpar2 itself is user-interface independent.
+ Its functionality is exposed through a simple XML-based web-service API,
+ designed to be easy to use from an Ajax-enabled browser, Flash
+ animation, Java applet, etc., or from a higher-level server-side language
+ like PHP, Perl or Java. Because session information can be shared between
+ browser-based logic and server-side scripting, there is tremendous
+ flexibility in how you implement application-specific logic on top
+ of Pazpar2.
+
+
+ Once you launch a search in Pazpar2, the operation continues behind the
+ scenes. Pazpar2 connects to servers, carries out searches, and
+ retrieves, deduplicates, and stores results internally. Your application
+ code may periodically inquire about the status of an ongoing operation,
+ and ask to see records or result set facets. Results become
+ available immediately, and it is easy to build end-user interfaces than
+ feel extremely responsive, even when searching more than 100 servers
+ concurrently.
+
+
+ Pazpar2 is designed to be highly configurable. Incoming records are
+ normalized to XML/UTF-8, and then further normalized using XSLT to a
+ simple internal representation that is suitable for analysis. By
+ providing XSLT stylesheets for different kinds of result records, you
+ can configure Pazpar2 to work against different kinds of information
+ retrieval servers. Finally, metadata is extracted in a configurable
+ way from this internal record, to support display, merging, ranking,
+ result set facets, and sorting. Pazpar2 is not bound to a specific model
+ of metadata, such as DublinCore or MARC: by providing the right
+ configuration, it can work with any combination of different kinds of data
+ in support of many different applications.
+
+
+ Pazpar2 is designed to be efficient and scalable. You can set it up to
+ search several hundred targets in parallel, or you can use it to support
+ hundreds of concurrent users. It is implemented with the same attention
+ to performance and economy that we use in our indexing engines, so that
+ you can focus on building your application without worrying about the
+ details of metasearch logic. You can devote all of your attention to
+ usability and let Pazpar2 do what it does best -- metasearch.
+
+
+ Pazpar2 is our attempt to re-think the traditional paradigms for
+ implementing and deploying metasearch logic, with an uncompromising
+ approach to performance, and attempting to make maximum use of the
+ capabilities of modern browsers. The demo user interface that
+ accompanies the distribution is but one example. If you think of new
+ ways of using Pazpar2, we hope you'll share them with us, and if we
+ can provide assistance with regards to training, design, programming,
+ integration with different backends, hosting, or support, please don't
+ hesitate to contact us. If you'd like to see functionality in Pazpar2
+ that is not there today, please don't hesitate to contact us. It may
+ already be in our development pipeline, or there might be a
+ possibility for you to help out by sponsoring development time or
+ code. Either way, get in touch and we will give you straight answers.
+
+
+ Enjoy!
+
+
+ Pazpar2 is covered by the GNU General Public License (GPL) version 2.
+ See for further information.
+
+
+
+
+ Connectors to non-standard databases
+
+ If you wish to connect to commercial or other databases which do not
+ support open standards, please contact Index Data on
+ info@indexdata.com. We have a
+ proprietary framework for building connectors that enable Pazpar2
+ to access
+ thousands of online databases, in addition to the vast number of catalogs
+ and online services that support the Z39.50/SRU/SRW/SOLR protocols.
+
+
+
+
+ A note on the name Pazpar2
+
+ The name Pazpar2 derives from three sources. One one hand, it is
+ Index Data's second major piece of software that does parallel
+ searching of Z39.50 targets. On the other, it is a near-homophone
+ of Passpartout, the ever-helpful servant in Jules Verne's novel
+ Around the World in Eighty Days (who helpfully uses the language
+ of his master). Finally, "passe par tout" means something like
+ "passes through anything" in French -- on other words, a universal
+ solution, or if you like a MasterKey.
+
+
Installation
- The Pazpar2 package very small. It includes documentation as well
+ The Pazpar2 package includes documentation as well
as the Pazpar2 server. The package also includes a simple user
- interface test1 which consists of a single HTML page and a single
+ interface called "test1", which consists of a single HTML page and a single
JavaScript file to illustrate the use of Pazpar2.
Pazpar2 depends on the following tools/libraries:
YAZ
-
-
- The popular Z39.50 toolkit for the C language.
- YAZ must be compiled with Libxml2/Libxslt support.
-
-
+
+
+ The popular Z39.50 toolkit for the C language.
+ YAZ must be compiled with Libxml2/Libxslt support.
+
+
International
- Components for Unicode (ICU)
-
-
- ICU provides Unicode support for non-English languages with
- character sets outside the range of 7bit ASCII, like
- Greek, Russian, German and French. Pazpar2 uses the ICU
- Unicode character conversions, Unicode normalization, case
- folding and other fundamental operations needed in
- tokenization, normalization and ranking of records.
-
-
- Compiling, linking, and usage of the ICU libraries is optional,
- but strongly recommended for usage in an international
- environment.
-
-
+ Components for Unicode (ICU)
+
+
+ ICU provides Unicode support for non-English languages with
+ character sets outside the range of 7bit ASCII, like
+ Greek, Russian, German and French. Pazpar2 uses the ICU
+ Unicode character conversions, Unicode normalization, case
+ folding and other fundamental operations needed in
+ tokenization, normalization and ranking of records.
+
+
+ Compiling, linking, and usage of the ICU libraries is optional,
+ but strongly recommended for usage in an international
+ environment.
+
+
@@ -191,28 +226,32 @@
- Installation on Unix (from Source)
+ Installation from source on Unix (including Linux, MacOS, etc.)
The latest source code for Pazpar2 is available from
.
- Only few systems have none of the required
- tools binary packages.
- If, for example, Libxml2/libXSLT libraries
- are already installed as development packages use these.
+ Most Unix-based operating systems have the required
+ tools available as binary packages.
+ For example, if Libxml2/libXSLT libraries
+ are already installed as development packages, use these.
- Ensure that the development libraries + header files are
+ Ensure that the development libraries and header files are
available on your system before compiling Pazpar2. For installation
- of YAZ, refer to the YAZ installation chapter.
+ of YAZ, refer to the Installation chapter of the YAZ manual at
+ .
+
+
+ Once the dependencies are in place, Pazpar2 can be unpacked and
+ installed as follows:
- gunzip -c pazpar2-version.tar.gz|tar xf -
- cd pazpar2-version
+ tar xzf pazpar2-VERSION.tar.gz
+ cd pazpar2-VERSION
./configure
make
- su
- make install
+ sudo make install
The make install will install manpages as well as the
@@ -222,65 +261,69 @@
changed with configure option .
-
+
- Installation on Windows (from Source)
-
- Pazpar2 can be built for Windows using
- Microsoft Visual Studio.
- The support files for building YAZ on Windows are located in the
- win directory. The compilation is performed
- using the win/makefile which is to be
- processed by the NMAKE utility part of Visual Studio.
-
-
- Ensure that the development libraries + header files are
- available on your system before compiling Pazpar2. For installation
- of YAZ, refer to the YAZ installation chapter.
- It is easiest if YAZ and Pazpar2 are unpacked in the same
- directory (side-by-side).
-
-
- The compilation is tuned by editing the makefile of Pazpar2.
- The process is similar to YAZ. Adjust the various directories
- YAZ_DIR, ZLIB_DIR, ..
-
-
- Compile Pazpar2 by invoking nmake in
- the win directory.
- The resulting binaries of the build process are located in the
- bin of the Pazpar2 source
- tree - including the pazpar2.exe and necessary DLLs.
-
-
- The Windows version of Pazpar2 is a console application. It may
- be installed as a Windows Service by adding option
- -install for the pazpar2 program. This will
- register Pazpar2 as a service and use the other options provided
- in the same invocation. For example:
-
- cd \MyPazpar2\etc
- ..\bin\pazpar2 -install -c pazpar2.cfg -l pazpar2.log
-
- The Pazpar2 service may now be controlled via the Service Control
- Panel. It may be unregistered by passing the -remove
- option. Example:
-
- cd \MyPazpar2\etc
- ..\bin\pazpar2 -remove
-
-
+ Installation from source on Windows
+
+ Pazpar2 can be built for Windows using
+ Microsoft Visual Studio.
+ The support files for building YAZ on Windows are located in the
+ win directory. The compilation is performed
+ using the win/makefile which is to be
+ processed by the NMAKE utility part of Visual Studio.
+
+
+ Ensure that the development libraries and header files are
+ available on your system before compiling Pazpar2. For installation
+ of YAZ, refer to
+ the Installation chapter of the YAZ manual at
+ .
+ It is easiest if YAZ and Pazpar2 are unpacked in the same
+ directory (side-by-side).
+
+
+ The compilation is tuned by editing the makefile of Pazpar2.
+ The process is similar to YAZ. Adjust the various directories
+ YAZ_DIR, ZLIB_DIR, etc.,
+ as required.
+
+
+ Compile Pazpar2 by invoking nmake in
+ the win directory.
+ The resulting binaries of the build process are located in the
+ bin of the Pazpar2 source
+ tree - including the pazpar2.exe and necessary DLLs.
+
+
+ The Windows version of Pazpar2 is a console application. It may
+ be installed as a Windows Service by adding option
+ -install for the pazpar2 program. This will
+ register Pazpar2 as a service and use the other options provided
+ in the same invocation. For example:
+
+ cd \MyPazpar2\etc
+ ..\bin\pazpar2 -install -f pazpar2.cfg -l pazpar2.log
+
+ The Pazpar2 service may now be controlled via the Service Control
+ Panel. It may be unregistered by passing the -remove
+ option. Example:
+
+ cd \MyPazpar2\etc
+ ..\bin\pazpar2 -remove
+
+
-
+
- Installation of test1 interface
+ Installation of test interfaces
- In this section we outline how to install a simple interface that
- is part of the Pazpar2 source package. Note that Debian users can
- save time by just installing package pazpar2-test1.
+ In this section we show how to make available the set of simple
+ interfaces that are part of the Pazpar2 source package, and which
+ demonstrate some ways to use Pazpar2. (Note that Debian users can
+ save time by just installing the package pazpar2-test1.)
- A web server must be installed and running on the system, such as Apache.
+ A web server, such as Apache, must be installed and running on the system.
@@ -289,39 +332,60 @@
cd etc
cp pazpar2.cfg.dist pazpar2.cfg
- ../src/pazpar2 -f pazpar2.cfg -t edu.xml
+ ../src/pazpar2 -f pazpar2.cfg
And on Windows:
cd etc
copy pazpar2.cfg.dist pazpar2.cfg
- ..\bin\pazpar2 -f pazpar2.cfg -t edu.xml
+ ..\bin\pazpar2 -f pazpar2.cfg
- This will start a Pazpar2 listener on port 8004. It will proxy
- HTTP requests to localhost - port 80, which we assume will be the regular
+ This will start a Pazpar2 listener on port 9004. It will proxy
+ HTTP requests to port 80 on localhost, which we assume will be the regular
HTTP server on the system. Inspect and modify pazpar2.cfg as needed
- if this is to be changed. The -t option specifies the list of targets
+ if this is to be changed. The pazpar2.cfg file includes settings from the
+ file settings/edu.xml
to use for searches.
+
- Make a new console and move to the other stuff.
- For more information about pazpar2 options refer to the manpage.
+ The test UIs are located in www. Ensure that this
+ directory is available to the web server by copying
+ www to the document root,
+ using Apache's Alias directive, or
+ creating a symbolic link: for example, on a Debian or Ubuntu
+ system with Apache2 installed from the standard package, you might
+ make the link as follows:
+
+ cd .../pazpar2
+ sudo ln -s `pwd`/www /var/www/pazpar2-demo
+
-
+
- The test1 UI is located in www/test1. Ensure this
- directory is available to the web server by either copying
- test1 to the document root, create a symlink or
- use Apache's Alias directive.
+ This makes the test applications visible at
+
+ but they can not be run successfully from that URL, as they submit
+ search requests back to the server form which they were served,
+ and Apache2 doesn't know how to handle them. Instead, the test
+ applications must be accessed from Pazpar2 itself, acting as a
+ proxy to Apache2, at the URL
+
- The interface test1 interface should now be available on port 8004.
+ From here, the demo applications can be
+ accessed: test1, test2 and
+ jsdemo
+ are pure HTML+JavaScript setups, needing no server-side
+ intelligence;
+ demo
+ requires PHP on the server.
- If you don't see the test1 interface. See if test1 is really available
- on the same URL but on port 80. If it's not, the Apache configuration
- (or other) is not correct.
+ If you don't see the test interfaces, check whether they are available
+ on port 80 (i.e. directly from the Apache2 server). If not, the
+ Apache configuration is incorrect.
In order to use Apache as frontend for the interface on port 80
@@ -331,22 +395,27 @@
- Installation on Debian GNU/Linux
+ Installation on Debian GNU/Linux and Ubuntu
- Index Data provides Debian packages for Pazpar2. These are prepared
- for Debian versions Etch and Lenny (as of 2007).
- These packages are available at
- .
+ Index Data provides Debian and Ubuntu packages for Pazpar2.
+ As of February 2010, these
+ are prepared for Debian versions Etch, Lenny and Squeeze; and for
+ Ubuntu versions 8.04 (hardy), 8.10 (intrepid), 9.04 (jaunty) and
+ 9.10 (karmic). These packages are available at
+ and
+ .
-
+
Apache 2 Proxy
Apache 2 has a
-
+
proxy module
- which allows Pazpar2 to become a backend to an Apache 2
+
+ which allows Pazpar2 to become a backend to an Apache 2
based web service. The Apache 2 proxy must operate in the
Reverse Proxy mode.
@@ -355,17 +424,19 @@
On a Debian based Apache 2 system, the relevant modules can
be enabled with:
- sudo a2enmod proxy_http
+ sudo a2enmod proxy_http proxy_balancer
-
+
Traditionally Pazpar2 interprets URL paths with suffix
/search.pz2.
The
- ProxyPass directive of Apache must be used to map a URL path
+
+ ProxyPass
+
+ directive of Apache must be used to map a URL path
the the Pazpar2 server (listening port).
@@ -402,16 +473,16 @@
-
+
-
+
Using Pazpar2
This chapter provides a general introduction to the use and
deployment of Pazpar2.
-
+
Pazpar2 and your systems architecture
@@ -442,7 +513,7 @@
with the server from which the enclosing HTML page or object
originated, Pazpar2 is designed so that it can act as a transparent
proxy in front of an existing webserver (see for details).
+ linkend="pazpar2_conf"/> for details).
In this mode, all regular
HTTP requests are transparently passed through to your webserver,
while Pazpar2 only intercepts search-related webservice requests.
@@ -466,8 +537,8 @@
Sometimes, it may be necessary to implement functionality on your
regular webserver that makes use of search results, for example to
implement data import functionality, emailing results, history
- lists, personal citation lists, interlibrary loan functionality
- ,etc. Fortunately, it is simple to exchange information between
+ lists, personal citation lists, interlibrary loan functionality,
+ etc. Fortunately, it is simple to exchange information between
Pazpar2, your browser scripting, and backend server-side scripting.
You can send a session ID and possibly a record ID from your browser
code to your server code, and from there use Pazpar2s webservice API
@@ -482,7 +553,7 @@
Your data model
Pazpar2 does not have a preconceived model of what makes up a data
- model. There are no assumption that records have specific fields or
+ model. There are no assumptions that records have specific fields or
that they are organized in any particular way. The only assumption
is that data comes packaged in a form that the software can work
with (presently, that means XML or MARC), and that you can provide
@@ -508,7 +579,7 @@
- The Shining
+ The Shining
King, Stephen
@@ -517,11 +588,11 @@
]]>
-
+
As you can see, there isn't much to it. There are really only a few
important elements to this file.
-
+
Elements should belong to the namespace
http://www.indexdata.com/pazpar2/1.0.
@@ -533,7 +604,8 @@
records are never merged. The 'metadata' elements provide the meat
of the elements -- the content. the 'type' attribute is used to
match each element against processing rules that determine what
- happens to the data element next.
+ happens to the data element next. The attribute, 'rank' specifies
+ specifies a multipler for ranking for this element.
@@ -563,7 +635,7 @@
The webservice API of Pazpar2 is described in detail in .
-
+
In brief, you use the 'init' command to create a session, a
temporary workspace which carries information about the current
@@ -580,8 +652,8 @@
Connecting to non-standard resources
Pazpar2 uses Z39.50 as its switchboard language -- i.e. as far as it
- is concerned, all resources speak Z39.50, or its webservices derivatives,
- SRU/SRW. It is, however, equipped
+ is concerned, all resources speak Z39.50, its webservices derivatives,
+ SRU/SRW and SOLR servers exposing Lucene indexes. It is, however, equipped
to handle a broad range of different server behavior, through
configurable query mapping and record normalization. If you develop
configuration, stylesheets, etc., for a new type of resources, we
@@ -597,11 +669,12 @@
no effort. Resources that use non-standard record formats will
require a bit of XSLT work, but that's all.
-
+
- But what about resources that don't support Z39.50 at all? Some resources might
- support OpenSearch, private, XML/HTTP-based protocols, or something
- else entirely. Some databases exist only as web user interfaces and
+ But what about resources that don't support Z39.50 at all?
+ Some resources might support OpenSearch, private, XML/HTTP-based
+ protocols, or something else entirely.
+ Some databases exist only as web user interfaces and
will require screen-scraping. Still others exist only as static
files, or perhaps as databases supporting the OAI-PMH protocol.
There is hope! Read on.
@@ -612,12 +685,12 @@
work with database vendors to support standards, so you don't have
to worry about programming against non-standard services. We also
provide tools (see SimpleServer)
+ url="http://www.indexdata.com/simpleserver">SimpleServer)
which make it comparatively easy to build gateways against servers
with non-standard behavior. Again, we encourage you to share any
work you do in this direction.
-
+
But the bottom line is that working with non-standard resources in
metasearching is really, really hard. If you want to build a
@@ -671,6 +744,88 @@
+
+ Load balancing
+
+ Just like any web server, Pazpar2, can be load balanced by a standard
+ hardware or software load balancer as long as the session stickiness
+ is ensured. If you are already running the Apache2 web server in front
+ of Pazpar2 and use the apache mod_proxy module to 'relay' client
+ requests to Pazpar2, this set up can be easily extended to include
+ load balancing capabilites.
+ To do so you need to enable the
+
+ mod_proxy_balance
+
+ module in your Apache2 installation.
+
+
+
+ On a Debian based Apache 2 system, the relevant modules can
+ be enabled with:
+
+ sudo a2enmod proxy_http
+
+
+
+
+ The mod_proxy_balancer can pass all 'sessionsticky' requests to the
+ same backend worker as long as the requests are marked with the
+ originating worker's ID (called 'route'). If the Pazpar2 serverID is
+ configured (by setting an 'id' attribute on the 'server' element in
+ the Pazpar2 configuration file) Pazpar2 will append it to the
+ 'session' element returned during the 'init' in a mod_proxy_balancer
+ compatible manner.
+ Since the 'session' is then re-sent by the client (for all pazpar2
+ request besides 'init'), the balancer can use the marker to pass
+ the request to the right route. To do so the balancer needs to be
+ configured to inspect the 'session' parameter.
+
+
+
+ Apache 2 load balancing configuration
+
+ Having 4 Pazpar2 instances running on the same host, port range of
+ 8004-8007 and serverIDs of: pz1, pz2, pz3 and pz4 respectively we
+ could use the following Apache 2 configuration to expose a single
+ pazpar2 'endpoint' on a standard
+ (/pazpar2/search.pz2) location:
+
+
+ AddDefaultCharset off
+ Order deny,allow
+ Allow from all
+
+ ProxyVia Off
+
+ # 'route' has to match the configured pazpar2 server ID
+
+ BalancerMember http://localhost:8004 route=pz1
+ BalancerMember http://localhost:8005 route=pz2
+ BalancerMember http://localhost:8006 route=pz3
+ BalancerMember http://localhost:8007 route=pz4
+
+
+ # route is resent in the 'session' param which has the form:
+ # 'sessid.serverid', understandable by the mod_proxy_load_balancer
+ # this is not going to work if the client tampers with the 'session' param
+ ProxyPass /pazpar2/search.pz2 balancer://pz2cluster lbmethod=byrequests stickysession=session nofailover=On
+ ]]>
+
+ The 'ProxyPass' line sets up a reverse proxy for request
+ â/pazpar2/search.pz2â and delegates all requests to the load balancer
+ (virtual worker) with name âpz2clusterâ.
+ Sticky sessions are enabled and implemented using the âsessionâ parameter.
+ The âProxyâ section lists all the servers (real workers) which the
+ load balancer can use.
+
+
+
+
+
+
+
@@ -684,334 +839,44 @@
&manref;
- License
-
- GPL
-
-
- Pazpar2,
- Copyright © ©right-year; Index Data.
-
-
-
- Pazpar2 is free software; you can redistribute it and/or modify it under
- the terms of the GNU General Public License as published by the Free
- Software Foundation; either version 2, or (at your option) any later
- version.
-
-
-
- Pazpar2 is distributed in the hope that it will be useful, but WITHOUT ANY
- WARRANTY; without even the implied warranty of MERCHANTABILITY or
- FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
- for more details.
-
-
-
- You should have received a copy of the GNU General Public License
- along with Pazpar2; see the file LICENSE. If not, write to the
- Free Software Foundation, 59 Temple Place - Suite 330, Boston, MA
- 02111-1307, USA.
-
-
-
- GNU GENERAL PUBLIC LICENSE
- Version 2, June 1991
-
- Copyright (C) 1989, 1991 Free Software Foundation, Inc.
- 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- Everyone is permitted to copy and distribute verbatim copies
- of this license document, but changing it is not allowed.
-
- Preamble
-
- The licenses for most software are designed to take away your
-freedom to share and change it. By contrast, the GNU General Public
-License is intended to guarantee your freedom to share and change free
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-General Public License applies to most of the Free Software
-Foundation's software and to any other program whose authors commit to
-using it. (Some other Free Software Foundation software is covered by
-the GNU Library General Public License instead.) You can apply it to
-your programs, too.
-
- When we speak of free software, we are referring to freedom, not
-price. Our General Public Licenses are designed to make sure that you
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-PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE
-POSSIBILITY OF SUCH DAMAGES.
-
- END OF TERMS AND CONDITIONS
-
-
+
+ License
+
+
+ Pazpar2,
+ Copyright © ©right-year; Index Data.
+
+
+
+ Pazpar2 is free software; you can redistribute it and/or modify it under
+ the terms of the GNU General Public License as published by the Free
+ Software Foundation; either version 2, or (at your option) any later
+ version.
+
+
+
+ Pazpar2 is distributed in the hope that it will be useful, but WITHOUT ANY
+ WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ for more details.
+
+
+
+ You should have received a copy of the GNU General Public License
+ along with Pazpar2; see the file LICENSE. If not, write to the
+ Free Software Foundation,
+ 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+
+
+
+ &gpl2;
-
+