Author: olamy
Date: Sat Apr 23 04:22:15 2022
New Revision: 1900184
URL: http://svn.apache.org/viewvc?rev=1900184&view=rev
Log:
Site checkin for project Apache Helix :: Website
Added:
helix/site-content/0.9.9-docs/jacoco/
helix/site-content/0.9.9-docs/jacoco/index.html
helix/site-content/0.9.9-docs/jacoco/jacoco-resources/
helix/site-content/0.9.9-docs/jacoco/jacoco-resources/branchfc.gif (with
props)
helix/site-content/0.9.9-docs/jacoco/jacoco-resources/branchnc.gif (with
props)
helix/site-content/0.9.9-docs/jacoco/jacoco-resources/branchpc.gif (with
props)
helix/site-content/0.9.9-docs/jacoco/jacoco-resources/bundle.gif (with
props)
helix/site-content/0.9.9-docs/jacoco/jacoco-resources/class.gif (with
props)
helix/site-content/0.9.9-docs/jacoco/jacoco-resources/down.gif (with
props)
helix/site-content/0.9.9-docs/jacoco/jacoco-resources/greenbar.gif (with
props)
helix/site-content/0.9.9-docs/jacoco/jacoco-resources/group.gif (with
props)
helix/site-content/0.9.9-docs/jacoco/jacoco-resources/method.gif (with
props)
helix/site-content/0.9.9-docs/jacoco/jacoco-resources/package.gif (with
props)
helix/site-content/0.9.9-docs/jacoco/jacoco-resources/prettify.css
helix/site-content/0.9.9-docs/jacoco/jacoco-resources/prettify.js
helix/site-content/0.9.9-docs/jacoco/jacoco-resources/redbar.gif (with
props)
helix/site-content/0.9.9-docs/jacoco/jacoco-resources/report.css
helix/site-content/0.9.9-docs/jacoco/jacoco-resources/report.gif (with
props)
helix/site-content/0.9.9-docs/jacoco/jacoco-resources/session.gif (with
props)
helix/site-content/0.9.9-docs/jacoco/jacoco-resources/sort.gif (with
props)
helix/site-content/0.9.9-docs/jacoco/jacoco-resources/sort.js
helix/site-content/0.9.9-docs/jacoco/jacoco-resources/source.gif (with
props)
helix/site-content/0.9.9-docs/jacoco/jacoco-resources/up.gif (with props)
helix/site-content/0.9.9-docs/jacoco/jacoco-sessions.html
helix/site-content/0.9.9-docs/jacoco/jacoco.csv
helix/site-content/0.9.9-docs/jacoco/jacoco.xml
helix/site-content/1.0.2-docs/jacoco/
helix/site-content/1.0.2-docs/jacoco/index.html
helix/site-content/1.0.2-docs/jacoco/jacoco-resources/
helix/site-content/1.0.2-docs/jacoco/jacoco-resources/branchfc.gif (with
props)
helix/site-content/1.0.2-docs/jacoco/jacoco-resources/branchnc.gif (with
props)
helix/site-content/1.0.2-docs/jacoco/jacoco-resources/branchpc.gif (with
props)
helix/site-content/1.0.2-docs/jacoco/jacoco-resources/bundle.gif (with
props)
helix/site-content/1.0.2-docs/jacoco/jacoco-resources/class.gif (with
props)
helix/site-content/1.0.2-docs/jacoco/jacoco-resources/down.gif (with
props)
helix/site-content/1.0.2-docs/jacoco/jacoco-resources/greenbar.gif (with
props)
helix/site-content/1.0.2-docs/jacoco/jacoco-resources/group.gif (with
props)
helix/site-content/1.0.2-docs/jacoco/jacoco-resources/method.gif (with
props)
helix/site-content/1.0.2-docs/jacoco/jacoco-resources/package.gif (with
props)
helix/site-content/1.0.2-docs/jacoco/jacoco-resources/prettify.css
helix/site-content/1.0.2-docs/jacoco/jacoco-resources/prettify.js
helix/site-content/1.0.2-docs/jacoco/jacoco-resources/redbar.gif (with
props)
helix/site-content/1.0.2-docs/jacoco/jacoco-resources/report.css
helix/site-content/1.0.2-docs/jacoco/jacoco-resources/report.gif (with
props)
helix/site-content/1.0.2-docs/jacoco/jacoco-resources/session.gif (with
props)
helix/site-content/1.0.2-docs/jacoco/jacoco-resources/sort.gif (with
props)
helix/site-content/1.0.2-docs/jacoco/jacoco-resources/sort.js
helix/site-content/1.0.2-docs/jacoco/jacoco-resources/source.gif (with
props)
helix/site-content/1.0.2-docs/jacoco/jacoco-resources/up.gif (with props)
helix/site-content/1.0.2-docs/jacoco/jacoco-sessions.html
helix/site-content/1.0.2-docs/jacoco/jacoco.csv
helix/site-content/1.0.2-docs/jacoco/jacoco.xml
helix/site-content/1.0.3-docs/
helix/site-content/1.0.3-docs/.htaccess
helix/site-content/1.0.3-docs/Building.html
helix/site-content/1.0.3-docs/Features.html
helix/site-content/1.0.3-docs/JobExample.json
helix/site-content/1.0.3-docs/Metrics.html
helix/site-content/1.0.3-docs/Quickstart.html
helix/site-content/1.0.3-docs/Tutorial.html
helix/site-content/1.0.3-docs/WorkflowExample.json
helix/site-content/1.0.3-docs/auto_exit_maintenance.html
helix/site-content/1.0.3-docs/css/
helix/site-content/1.0.3-docs/css/apache-maven-fluido-1.11.0-SNAPSHOT.min.css
helix/site-content/1.0.3-docs/css/bootstrap-responsive.min.css
helix/site-content/1.0.3-docs/css/bootstrap.min.css
helix/site-content/1.0.3-docs/css/print.css
helix/site-content/1.0.3-docs/css/site.css
helix/site-content/1.0.3-docs/dependencies.html
helix/site-content/1.0.3-docs/dependency-info.html
helix/site-content/1.0.3-docs/dependency-management.html
helix/site-content/1.0.3-docs/design_crushed.html
helix/site-content/1.0.3-docs/distribution-management.html
helix/site-content/1.0.3-docs/download.cgi
helix/site-content/1.0.3-docs/download.html
helix/site-content/1.0.3-docs/fonts/
helix/site-content/1.0.3-docs/fonts/glyphicons-halflings-regular.eot
(with props)
helix/site-content/1.0.3-docs/fonts/glyphicons-halflings-regular.svg
helix/site-content/1.0.3-docs/fonts/glyphicons-halflings-regular.ttf
(with props)
helix/site-content/1.0.3-docs/fonts/glyphicons-halflings-regular.woff
(with props)
helix/site-content/1.0.3-docs/images/
helix/site-content/1.0.3-docs/images/CustomizedViewSystemArchitecture.jpeg
(with props)
helix/site-content/1.0.3-docs/images/HelixPriorityLockWorkflow.jpeg (with
props)
helix/site-content/1.0.3-docs/images/PFS-Generic.png (with props)
helix/site-content/1.0.3-docs/images/ParticipantAutoRegistrationLogic.png
(with props)
helix/site-content/1.0.3-docs/images/RSYNC_BASED_PFS.png (with props)
helix/site-content/1.0.3-docs/images/TaskFrameworkLayers.png (with props)
helix/site-content/1.0.3-docs/images/UIScreenshot.png (with props)
helix/site-content/1.0.3-docs/images/UIScreenshot2.png (with props)
helix/site-content/1.0.3-docs/images/accessories-text-editor.png (with
props)
helix/site-content/1.0.3-docs/images/add.gif (with props)
helix/site-content/1.0.3-docs/images/apache-maven-project-2.png (with
props)
helix/site-content/1.0.3-docs/images/application-certificate.png (with
props)
helix/site-content/1.0.3-docs/images/auto-exit-maintenance.jpg (with
props)
helix/site-content/1.0.3-docs/images/close.gif (with props)
helix/site-content/1.0.3-docs/images/contact-new.png (with props)
helix/site-content/1.0.3-docs/images/design/
helix/site-content/1.0.3-docs/images/design/crushed/
helix/site-content/1.0.3-docs/images/design/crushed/after-using-crushed.png
(with props)
helix/site-content/1.0.3-docs/images/design/crushed/before-using-crush.png
(with props)
helix/site-content/1.0.3-docs/images/design/crushed/classes.png (with
props)
helix/site-content/1.0.3-docs/images/design/crushed/crushed-master-dist.png
(with props)
helix/site-content/1.0.3-docs/images/design/crushed/crushed-partition-dist.png
(with props)
helix/site-content/1.0.3-docs/images/design/crushed/cursh-master-dist.png
(with props)
helix/site-content/1.0.3-docs/images/design/crushed/cursh-partition-dist.png
(with props)
helix/site-content/1.0.3-docs/images/design/crushed/example-cluster-master-dist-after.png
(with props)
helix/site-content/1.0.3-docs/images/design/crushed/example-cluster-master-dist.png
(with props)
helix/site-content/1.0.3-docs/images/design/crushed/example-cluster-partition-dist.png
(with props)
helix/site-content/1.0.3-docs/images/design/crushed/example-movement-on-expansion.png
(with props)
helix/site-content/1.0.3-docs/images/design/crushed/node-down-master-move.png
(with props)
helix/site-content/1.0.3-docs/images/design/crushed/node-down-partition-move.png
(with props)
helix/site-content/1.0.3-docs/images/design/crushed/performance.png (with
props)
helix/site-content/1.0.3-docs/images/document-properties.png (with props)
helix/site-content/1.0.3-docs/images/drive-harddisk.png (with props)
helix/site-content/1.0.3-docs/images/fix.gif (with props)
helix/site-content/1.0.3-docs/images/icon_error_sml.gif (with props)
helix/site-content/1.0.3-docs/images/icon_help_sml.gif (with props)
helix/site-content/1.0.3-docs/images/icon_info_sml.gif (with props)
helix/site-content/1.0.3-docs/images/icon_success_sml.gif (with props)
helix/site-content/1.0.3-docs/images/icon_warning_sml.gif (with props)
helix/site-content/1.0.3-docs/images/image-x-generic.png (with props)
helix/site-content/1.0.3-docs/images/internet-web-browser.png (with props)
helix/site-content/1.0.3-docs/images/logos/
helix/site-content/1.0.3-docs/images/logos/build-by-maven-black.png (with
props)
helix/site-content/1.0.3-docs/images/logos/build-by-maven-white.png (with
props)
helix/site-content/1.0.3-docs/images/logos/maven-feather.png (with props)
helix/site-content/1.0.3-docs/images/network-server.png (with props)
helix/site-content/1.0.3-docs/images/package-x-generic.png (with props)
helix/site-content/1.0.3-docs/images/profiles/
helix/site-content/1.0.3-docs/images/profiles/pre-release.png (with props)
helix/site-content/1.0.3-docs/images/profiles/retired.png (with props)
helix/site-content/1.0.3-docs/images/profiles/sandbox.png (with props)
helix/site-content/1.0.3-docs/images/quota_InstanceCapacityManager.jpeg
(with props)
helix/site-content/1.0.3-docs/images/quota_intro.png (with props)
helix/site-content/1.0.3-docs/images/remove.gif (with props)
helix/site-content/1.0.3-docs/images/rss.png (with props)
helix/site-content/1.0.3-docs/images/update.gif (with props)
helix/site-content/1.0.3-docs/images/window-new.png (with props)
helix/site-content/1.0.3-docs/img/
helix/site-content/1.0.3-docs/img/glyphicons-halflings-white.png (with
props)
helix/site-content/1.0.3-docs/img/glyphicons-halflings.png (with props)
helix/site-content/1.0.3-docs/index.html
helix/site-content/1.0.3-docs/integration.html
helix/site-content/1.0.3-docs/issue-tracking.html
helix/site-content/1.0.3-docs/jacoco/
helix/site-content/1.0.3-docs/jacoco/index.html
helix/site-content/1.0.3-docs/jacoco/jacoco-resources/
helix/site-content/1.0.3-docs/jacoco/jacoco-resources/branchfc.gif (with
props)
helix/site-content/1.0.3-docs/jacoco/jacoco-resources/branchnc.gif (with
props)
helix/site-content/1.0.3-docs/jacoco/jacoco-resources/branchpc.gif (with
props)
helix/site-content/1.0.3-docs/jacoco/jacoco-resources/bundle.gif (with
props)
helix/site-content/1.0.3-docs/jacoco/jacoco-resources/class.gif (with
props)
helix/site-content/1.0.3-docs/jacoco/jacoco-resources/down.gif (with
props)
helix/site-content/1.0.3-docs/jacoco/jacoco-resources/greenbar.gif (with
props)
helix/site-content/1.0.3-docs/jacoco/jacoco-resources/group.gif (with
props)
helix/site-content/1.0.3-docs/jacoco/jacoco-resources/method.gif (with
props)
helix/site-content/1.0.3-docs/jacoco/jacoco-resources/package.gif (with
props)
helix/site-content/1.0.3-docs/jacoco/jacoco-resources/prettify.css
helix/site-content/1.0.3-docs/jacoco/jacoco-resources/prettify.js
helix/site-content/1.0.3-docs/jacoco/jacoco-resources/redbar.gif (with
props)
helix/site-content/1.0.3-docs/jacoco/jacoco-resources/report.css
helix/site-content/1.0.3-docs/jacoco/jacoco-resources/report.gif (with
props)
helix/site-content/1.0.3-docs/jacoco/jacoco-resources/session.gif (with
props)
helix/site-content/1.0.3-docs/jacoco/jacoco-resources/sort.gif (with
props)
helix/site-content/1.0.3-docs/jacoco/jacoco-resources/sort.js
helix/site-content/1.0.3-docs/jacoco/jacoco-resources/source.gif (with
props)
helix/site-content/1.0.3-docs/jacoco/jacoco-resources/up.gif (with props)
helix/site-content/1.0.3-docs/jacoco/jacoco-sessions.html
helix/site-content/1.0.3-docs/jacoco/jacoco.csv
helix/site-content/1.0.3-docs/jacoco/jacoco.xml
helix/site-content/1.0.3-docs/js/
helix/site-content/1.0.3-docs/js/apache-maven-fluido-1.11.0-SNAPSHOT.min.js
helix/site-content/1.0.3-docs/js/bootstrap.min.js
helix/site-content/1.0.3-docs/js/jquery.min.js
helix/site-content/1.0.3-docs/license.html
helix/site-content/1.0.3-docs/mail-lists.html
helix/site-content/1.0.3-docs/plugin-management.html
helix/site-content/1.0.3-docs/plugins.html
helix/site-content/1.0.3-docs/privacy-policy.html
helix/site-content/1.0.3-docs/project-info.html
helix/site-content/1.0.3-docs/project-summary.html
helix/site-content/1.0.3-docs/quota_scheduling.html
helix/site-content/1.0.3-docs/recipes/
helix/site-content/1.0.3-docs/recipes/lock_manager.html
helix/site-content/1.0.3-docs/recipes/rabbitmq_consumer_group.html
helix/site-content/1.0.3-docs/recipes/rsync_replicated_file_store.html
helix/site-content/1.0.3-docs/recipes/service_discovery.html
helix/site-content/1.0.3-docs/recipes/task_dag_execution.html
helix/site-content/1.0.3-docs/releasenotes/
helix/site-content/1.0.3-docs/releasenotes/release-1.0.3.html
helix/site-content/1.0.3-docs/source-repository.html
helix/site-content/1.0.3-docs/team-list.html
helix/site-content/1.0.3-docs/tutorial_admin.html
helix/site-content/1.0.3-docs/tutorial_agent.html
helix/site-content/1.0.3-docs/tutorial_cloud_support.html
helix/site-content/1.0.3-docs/tutorial_controller.html
helix/site-content/1.0.3-docs/tutorial_customized_view.html
helix/site-content/1.0.3-docs/tutorial_distributed_lock.html
helix/site-content/1.0.3-docs/tutorial_health.html
helix/site-content/1.0.3-docs/tutorial_messaging.html
helix/site-content/1.0.3-docs/tutorial_participant.html
helix/site-content/1.0.3-docs/tutorial_propstore.html
helix/site-content/1.0.3-docs/tutorial_rebalance.html
helix/site-content/1.0.3-docs/tutorial_rest_service.html
helix/site-content/1.0.3-docs/tutorial_spectator.html
helix/site-content/1.0.3-docs/tutorial_state.html
helix/site-content/1.0.3-docs/tutorial_task_framework.html
helix/site-content/1.0.3-docs/tutorial_task_throttling.html
helix/site-content/1.0.3-docs/tutorial_throttling.html
helix/site-content/1.0.3-docs/tutorial_ui.html
helix/site-content/1.0.3-docs/tutorial_user_content_store.html
helix/site-content/1.0.3-docs/tutorial_user_def_rebalancer.html
helix/site-content/1.0.3-docs/tutorial_yaml.html
Removed:
helix/site-content/0.9.9-docs/css/bootswatch.css
helix/site-content/0.9.9-docs/css/docs.css
helix/site-content/0.9.9-docs/css/lightbox.css
helix/site-content/0.9.9-docs/css/reflow-skin.css
helix/site-content/0.9.9-docs/images/close.png
helix/site-content/0.9.9-docs/images/loading.gif
helix/site-content/0.9.9-docs/images/next.png
helix/site-content/0.9.9-docs/images/prev.png
helix/site-content/0.9.9-docs/js/jquery-1.8.3.min.js
helix/site-content/0.9.9-docs/js/jquery.ba-bbq.min.js
helix/site-content/0.9.9-docs/js/jquery.smooth-scroll.min.js
helix/site-content/0.9.9-docs/js/lightbox.js
helix/site-content/0.9.9-docs/js/reflow-skin.js
helix/site-content/1.0.2-docs/css/bootswatch.css
helix/site-content/1.0.2-docs/css/docs.css
helix/site-content/1.0.2-docs/css/lightbox.css
helix/site-content/1.0.2-docs/css/reflow-skin.css
helix/site-content/1.0.2-docs/images/close.png
helix/site-content/1.0.2-docs/images/loading.gif
helix/site-content/1.0.2-docs/images/next.png
helix/site-content/1.0.2-docs/images/prev.png
helix/site-content/1.0.2-docs/js/jquery-1.8.3.min.js
helix/site-content/1.0.2-docs/js/jquery.ba-bbq.min.js
helix/site-content/1.0.2-docs/js/jquery.smooth-scroll.min.js
helix/site-content/1.0.2-docs/js/lightbox.js
helix/site-content/1.0.2-docs/js/reflow-skin.js
helix/site-content/1.0.4-docs/
Modified:
helix/site-content/0.9.9-docs/Building.html
helix/site-content/0.9.9-docs/Features.html
helix/site-content/0.9.9-docs/Metrics.html
helix/site-content/0.9.9-docs/Quickstart.html
helix/site-content/0.9.9-docs/Tutorial.html
helix/site-content/0.9.9-docs/auto_exit_maintenance.html
helix/site-content/0.9.9-docs/css/print.css
helix/site-content/0.9.9-docs/design_crushed.html
helix/site-content/0.9.9-docs/download.html
helix/site-content/0.9.9-docs/index.html
helix/site-content/0.9.9-docs/privacy-policy.html
helix/site-content/0.9.9-docs/quota_scheduling.html
helix/site-content/0.9.9-docs/recipes/lock_manager.html
helix/site-content/0.9.9-docs/recipes/rabbitmq_consumer_group.html
helix/site-content/0.9.9-docs/recipes/rsync_replicated_file_store.html
helix/site-content/0.9.9-docs/recipes/service_discovery.html
helix/site-content/0.9.9-docs/recipes/task_dag_execution.html
helix/site-content/0.9.9-docs/releasenotes/release-0.9.9.html
helix/site-content/0.9.9-docs/tutorial_admin.html
helix/site-content/0.9.9-docs/tutorial_agent.html
helix/site-content/0.9.9-docs/tutorial_controller.html
helix/site-content/0.9.9-docs/tutorial_health.html
helix/site-content/0.9.9-docs/tutorial_messaging.html
helix/site-content/0.9.9-docs/tutorial_participant.html
helix/site-content/0.9.9-docs/tutorial_propstore.html
helix/site-content/0.9.9-docs/tutorial_rebalance.html
helix/site-content/0.9.9-docs/tutorial_rest_service.html
helix/site-content/0.9.9-docs/tutorial_spectator.html
helix/site-content/0.9.9-docs/tutorial_state.html
helix/site-content/0.9.9-docs/tutorial_task_framework.html
helix/site-content/0.9.9-docs/tutorial_task_throttling.html
helix/site-content/0.9.9-docs/tutorial_throttling.html
helix/site-content/0.9.9-docs/tutorial_ui.html
helix/site-content/0.9.9-docs/tutorial_user_content_store.html
helix/site-content/0.9.9-docs/tutorial_user_def_rebalancer.html
helix/site-content/0.9.9-docs/tutorial_yaml.html
helix/site-content/1.0.2-docs/Building.html
helix/site-content/1.0.2-docs/Features.html
helix/site-content/1.0.2-docs/Metrics.html
helix/site-content/1.0.2-docs/Quickstart.html
helix/site-content/1.0.2-docs/Tutorial.html
helix/site-content/1.0.2-docs/auto_exit_maintenance.html
helix/site-content/1.0.2-docs/css/print.css
helix/site-content/1.0.2-docs/design_crushed.html
helix/site-content/1.0.2-docs/download.html
helix/site-content/1.0.2-docs/index.html
helix/site-content/1.0.2-docs/privacy-policy.html
helix/site-content/1.0.2-docs/quota_scheduling.html
helix/site-content/1.0.2-docs/recipes/lock_manager.html
helix/site-content/1.0.2-docs/recipes/rabbitmq_consumer_group.html
helix/site-content/1.0.2-docs/recipes/rsync_replicated_file_store.html
helix/site-content/1.0.2-docs/recipes/service_discovery.html
helix/site-content/1.0.2-docs/recipes/task_dag_execution.html
helix/site-content/1.0.2-docs/releasenotes/release-1.0.2.html
helix/site-content/1.0.2-docs/tutorial_admin.html
helix/site-content/1.0.2-docs/tutorial_agent.html
helix/site-content/1.0.2-docs/tutorial_cloud_support.html
helix/site-content/1.0.2-docs/tutorial_controller.html
helix/site-content/1.0.2-docs/tutorial_customized_view.html
helix/site-content/1.0.2-docs/tutorial_distributed_lock.html
helix/site-content/1.0.2-docs/tutorial_health.html
helix/site-content/1.0.2-docs/tutorial_messaging.html
helix/site-content/1.0.2-docs/tutorial_participant.html
helix/site-content/1.0.2-docs/tutorial_propstore.html
helix/site-content/1.0.2-docs/tutorial_rebalance.html
helix/site-content/1.0.2-docs/tutorial_rest_service.html
helix/site-content/1.0.2-docs/tutorial_spectator.html
helix/site-content/1.0.2-docs/tutorial_state.html
helix/site-content/1.0.2-docs/tutorial_task_framework.html
helix/site-content/1.0.2-docs/tutorial_task_throttling.html
helix/site-content/1.0.2-docs/tutorial_throttling.html
helix/site-content/1.0.2-docs/tutorial_ui.html
helix/site-content/1.0.2-docs/tutorial_user_content_store.html
helix/site-content/1.0.2-docs/tutorial_user_def_rebalancer.html
helix/site-content/1.0.2-docs/tutorial_yaml.html
helix/site-content/Architecture.html
helix/site-content/ClientLibraries.html
helix/site-content/Concepts.html
helix/site-content/IRC.html
helix/site-content/Publications.html
helix/site-content/UseCases.html
helix/site-content/design/crush-ed.html
helix/site-content/download.html
helix/site-content/index.html
helix/site-content/involved/building.html
helix/site-content/involved/contribdocs.html
helix/site-content/modules.html
helix/site-content/privacy-policy.html
helix/site-content/releasing.html
helix/site-content/sources.html
Modified: helix/site-content/0.9.9-docs/Building.html
URL:
http://svn.apache.org/viewvc/helix/site-content/0.9.9-docs/Building.html?rev=1900184&r1=1900183&r2=1900184&view=diff
==============================================================================
--- helix/site-content/0.9.9-docs/Building.html (original)
+++ helix/site-content/0.9.9-docs/Building.html Sat Apr 23 04:22:15 2022
@@ -1,200 +1,194 @@
-
<!DOCTYPE html>
+
+
<!--
- Generated by Apache Maven Doxia at 2022-04-23
- Rendered using Maven Reflow Skin 1.0.0
(http://andriusvelykis.github.com/reflow-maven-skin)
+ | Generated by Apache Maven Doxia Site Renderer 1.11.1 from
src/site/markdown/Building.md at 2022-04-23
+ | Rendered using Apache Maven Fluido Skin 1.11.0-SNAPSHOT
-->
-<html xml:lang="en" lang="en">
-
- <head>
- <meta charset="UTF-8" />
- <title>Apache Helix – Build Instructions</title>
- <meta name="viewport" content="width=device-width,
initial-scale=1.0" />
- <meta name="description" content="" />
- <meta http-equiv="content-language" content="en" />
-
- <link
href="http://netdna.bootstrapcdn.com/twitter-bootstrap/2.2.2/css/bootstrap.min.css";
rel="stylesheet" />
- <link
href="http://netdna.bootstrapcdn.com/twitter-bootstrap/2.2.2/css/bootstrap-responsive.min.css";
rel="stylesheet" />
- <link href="./css/docs.css" rel="stylesheet" />
- <link href="./css/reflow-skin.css" rel="stylesheet" />
-
-
- <link href="./css/lightbox.css" rel="stylesheet" />
-
- <link href="./css/site.css" rel="stylesheet" />
- <link href="./css/print.css" rel="stylesheet" media="print" />
-
- <!-- Le HTML5 shim, for IE6-8 support of HTML5 elements -->
- <!--[if lt IE 9]>
- <script
src="http://html5shim.googlecode.com/svn/trunk/html5.js";></script>
- <![endif]-->
-
- </head>
-
- <body class="page-$config.fileId project-$config.projectId"
data-spy="scroll" data-offset="60" data-target="#toc-scroll-target">
-
- <div class="navbar navbar-fixed-top">
- <div class="navbar-inner">
- <div class="container">
- <a class="btn btn-navbar"
data-toggle="collapse" data-target=".nav-collapse">
- <span class="icon-bar"></span>
- <span class="icon-bar"></span>
- <span class="icon-bar"></span>
- </a>
- <div class="nav-collapse">
- <ul class="nav pull-right">
- <li class="active"><a
href="" title="Helix 0.9.9">Helix 0.9.9 </a></li>
- <li class="dropdown
active">
- <a href="#"
class="dropdown-toggle" data-toggle="dropdown">Get Helix <b
class="caret"></b></a>
- <ul
class="dropdown-menu">
- <li
class="active"><a href="" title="Download">Download </a></li>
- <li
class="active"><a href="" title="Building">Building </a></li>
- <li
class="active"><a href="" title="Release Notes">Release Notes </a></li>
- </ul>
- </li>
- <li class="dropdown
active">
- <a href="#"
class="dropdown-toggle" data-toggle="dropdown">Hands-On <b
class="caret"></b></a>
- <ul
class="dropdown-menu">
- <li
class="active"><a href="" title="Quick Start">Quick Start </a></li>
- <li
class="active"><a href="" title="Tutorial">Tutorial </a></li>
- <li
class="active"><a href="" title="Javadocs">Javadocs </a></li>
- </ul>
- </li>
- <li class="dropdown
active">
- <a href="#"
class="dropdown-toggle" data-toggle="dropdown">Recipes <b class="caret"></b></a>
- <ul
class="dropdown-menu">
- <li
class="active"><a href="" title="Distributed lock manager">Distributed lock
manager </a></li>
- <li
class="active"><a href="" title="Rabbit MQ consumer group">Rabbit MQ consumer
group </a></li>
- <li
class="active"><a href="" title="Rsync replicated file store">Rsync replicated
file store </a></li>
- <li
class="active"><a href="" title="Service discovery">Service discovery </a></li>
- <li
class="active"><a href="" title="Distributed task DAG execution">Distributed
task DAG execution </a></li>
- </ul>
- </li>
- </ul>
- </div><!--/.nav-collapse -->
- </div>
- </div>
- </div>
-
- <div class="container">
-
- <!-- Masthead
- ================================================== -->
- <header class="jumbotron subhead">
- <div class="row" id="banner">
- <div class="span12">
- <div class="pull-left">
- <a href="" id="bannerLeft"><img src=""
alt='"''"' /></a>
- </div>
- <div class="pull-right">
- <a href="http://www.apache.org/";
id="bannerRight"><img src="" alt='"''"' /></a>
- </div>
- </div>
- </div>
- <div>
- <ul class="breadcrumb">
- <li><a href="" title="Apache Helix">Apache
Helix </a></li>
- <li class="divider">/</li>
- <li><a href="" title="Release 0.9.9">Release
0.9.9 </a></li>
- <li class="divider">/</li>
- <li>Build Instructions</li>
- <li class="publishDate version-date
pull-right">Last Published: 2022-04-23</li>
- </ul>
- </div>
- </header>
-
- <div class="main-body">
- <div class="row">
- <div class="span12">
- <div class="body-content">
-$bodyWithHeader
- </div>
- </div>
- </div>
- </div>
-
- </div><!-- /container -->
-
- <!-- Footer
- ================================================== -->
- <footer class="well">
- <div class="container">
- <div class="row">
- <div class="span9 bottom-nav">
- <ul class="nav nav-list">
- <li class="nav-header">Get
Helix</li>
- <li class="active">
- <a href="#"
title="Download">Download </a>
- </li>
- <li class="active">
- <a href="#"
title="Building">Building </a>
- </li>
- <li class="active">
- <a href="#"
title="Release Notes">Release Notes </a>
- </li>
- <li
class="nav-header">Hands-On</li>
- <li class="active">
- <a href="#"
title="Quick Start">Quick Start </a>
- </li>
- <li class="active">
- <a href="#"
title="Tutorial">Tutorial </a>
- </li>
- <li class="active">
- <a href="#"
title="Javadocs">Javadocs </a>
- </li>
- <li
class="nav-header">Recipes</li>
- <li class="active">
- <a href="#"
title="Distributed lock manager">Distributed lock manager </a>
- </li>
- <li class="active">
- <a href="#"
title="Rabbit MQ consumer group">Rabbit MQ consumer group </a>
- </li>
- <li class="active">
- <a href="#"
title="Rsync replicated file store">Rsync replicated file store </a>
- </li>
- <li class="active">
- <a href="#"
title="Service discovery">Service discovery </a>
- </li>
- <li class="active">
- <a href="#"
title="Distributed task DAG execution">Distributed task DAG execution </a>
- </li>
- </ul>
- </div>
- </div>
- </div>
- </footer>
-
- <div class="container subfooter">
- <div class="row">
- <div class="span12">
- <p class="pull-right"><a href="#">Back to
top</a></p>
- <p class="copyright">Copyright ©2022 <a
href="https://www.apache.org/";>The Apache Software Foundation</a>. All Rights
Reserved.</p>
- <p><a
href="http://github.com/andriusvelykis/reflow-maven-skin"; title="Reflow Maven
skin">Reflow Maven skin</a> by <a href="http://andrius.velykis.lt";
target="_blank" title="Andrius Velykis">Andrius Velykis</a>.</p>
- </div>
- </div>
- </div>
-
- <!-- Le javascript
- ================================================== -->
- <!-- Placed at the end of the document so the pages load faster -->
-
- <!-- Fallback jQuery loading from Google CDN:
-
http://stackoverflow.com/questions/1014203/best-way-to-use-googles-hosted-jquery-but-fall-back-to-my-hosted-library-on-go
-->
- <script type="text/javascript"
src="http://ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js";></script>
- <script type="text/javascript">
- if (typeof jQuery == 'undefined')
- {
- document.write(unescape("%3Cscript
src='./js/jquery-1.8.3.min.js' type='text/javascript'%3E%3C/script%3E"));
- }
- </script>
-
- <script
src="http://netdna.bootstrapcdn.com/twitter-bootstrap/2.2.2/js/bootstrap.min.js";></script>
- <script src="./js/lightbox.js"></script>
- <script src="./js/jquery.smooth-scroll.min.js"></script>
- <!-- back button support for smooth scroll -->
- <script src="./js/jquery.ba-bbq.min.js"></script>
-
- <script src="./js/reflow-skin.js"></script>
-
- </body>
+<html xmlns="http://www.w3.org/1999/xhtml"; lang="en">
+ <head>
+ <meta charset="UTF-8" />
+ <meta name="viewport" content="width=device-width, initial-scale=1" />
+ <meta name="generator" content="Apache Maven Doxia Site Renderer 1.11.1" />
+ <title>Apache Helix – Build Instructions</title>
+ <link rel="stylesheet"
href="./css/apache-maven-fluido-1.11.0-SNAPSHOT.min.css" />
+ <link rel="stylesheet" href="./css/site.css" />
+ <link rel="stylesheet" href="./css/print.css" media="print" />
+ <script src="./js/apache-maven-fluido-1.11.0-SNAPSHOT.min.js"></script>
+<script type="text/javascript">
+
+ var _gaq = _gaq || [];
+ _gaq.push(['_setAccount', 'UA-3211522-12']);
+ _gaq.push(['_trackPageview']);
+
+ (function() {
+ var ga = document.createElement('script'); ga.type =
'text/javascript'; ga.async = true;
+ ga.src = ('https:' == document.location.protocol ? 'https://ssl' :
'http://www') + '.google-analytics.com/ga.js';
+ var s = document.getElementsByTagName('script')[0];
s.parentNode.insertBefore(ga, s);
+ })();
+
+ </script>
+ </head>
+ <body class="topBarEnabled">
+ <header id="topbar" class="navbar navbar-fixed-top ">
+ <div class="navbar-inner">
+ <div class="container-fluid">
+ <a data-target=".nav-collapse" data-toggle="collapse" class="btn
btn-navbar">
+ <span class="icon-bar"></span>
+ <span class="icon-bar"></span>
+ <span class="icon-bar"></span>
+ </a>
+ <ul class="nav">
+ <li class="dropdown">
+ <a href="#" class="dropdown-toggle" data-toggle="dropdown">Get Helix
<b class="caret"></b></a>
+ <ul class="dropdown-menu">
+ <li><a href="download.html" title="Download">Download</a></li>
+ <li><a href="Building.html" title="Building">Building</a></li>
+ <li><a href="releasenotes/release-0.9.9.html" title="Release
Notes">Release Notes</a></li>
+ </ul>
+ </li>
+ <li class="dropdown">
+ <a href="#" class="dropdown-toggle" data-toggle="dropdown">Hands-On <b
class="caret"></b></a>
+ <ul class="dropdown-menu">
+ <li><a href="Quickstart.html" title="Quick Start">Quick
Start</a></li>
+ <li><a href="Tutorial.html" title="Tutorial">Tutorial</a></li>
+ <li><a href="../javadocs/0.9.9" title="Javadocs">Javadocs</a></li>
+ </ul>
+ </li>
+ <li class="dropdown">
+ <a href="#" class="dropdown-toggle" data-toggle="dropdown">Recipes <b
class="caret"></b></a>
+ <ul class="dropdown-menu">
+ <li><a href="recipes/lock_manager.html" title="Distributed lock
manager">Distributed lock manager</a></li>
+ <li><a href="recipes/rabbitmq_consumer_group.html" title="Rabbit
MQ consumer group">Rabbit MQ consumer group</a></li>
+ <li><a href="recipes/rsync_replicated_file_store.html"
title="Rsync replicated file store">Rsync replicated file store</a></li>
+ <li><a href="recipes/service_discovery.html" title="Service
discovery">Service discovery</a></li>
+ <li><a href="recipes/task_dag_execution.html" title="Distributed
task DAG execution">Distributed task DAG execution</a></li>
+ </ul>
+ </li>
+ </ul>
+ <ul class="nav pull-right">
+ <li class="dropdown">
+ <a href="#" class="dropdown-toggle"
data-toggle="dropdown">External Links <b class="caret"></b></a>
+ <ul class="dropdown-menu">
+ <li><a href="index.html" title="Helix 0.9.9">Helix 0.9.9</a></li>
+ </ul>
+ </li>
+ </ul>
+ </div>
+ </div>
+ </header>
+ <div class="container-fluid">
+ <header>
+ <div id="banner">
+ <div class="pull-left"><a href="http://helix.apache.org/";
id="bannerLeft"><img src="../images/helix-logo.jpg" alt=""/></a></div>
+ <div class="pull-right"><a href="http://www.apache.org/";
id="bannerRight"><img src="../images/feather_small.gif" alt=""/></a></div>
+ <div class="clear"><hr/></div>
+ </div>
+
+ <div id="breadcrumbs">
+ <ul class="breadcrumb">
+ <li class=""><a href="http://helix.apache.org/"; class="externalLink"
title="Apache Helix">Apache Helix</a><span class="divider">/</span></li>
+ <li class=""><a href="../" title="Apache Helix">Apache Helix</a><span
class="divider">/</span></li>
+ <li class=""><a href="./" title="Release 0.9.9">Release 0.9.9</a><span
class="divider">/</span></li>
+ <li class="active ">Build Instructions</li>
+ <li id="publishDate" class="pull-right">Last Published: 2022-04-23</li>
+ </ul>
+ </div>
+ </header>
+ <div class="row-fluid">
+ <header id="leftColumn" class="span2">
+ <nav class="well sidebar-nav">
+ <ul class="nav nav-list">
+ <li class="nav-header">Get Helix</li>
+ <li><a href="download.html" title="Download"><span
class="none"></span>Download</a></li>
+ <li class="active"><a href="#"><span class="none"></span>Building</a></li>
+ <li><a href="releasenotes/release-0.9.9.html" title="Release Notes"><span
class="none"></span>Release Notes</a></li>
+ <li class="nav-header">Hands-On</li>
+ <li><a href="Quickstart.html" title="Quick Start"><span
class="none"></span>Quick Start</a></li>
+ <li><a href="Tutorial.html" title="Tutorial"><span
class="none"></span>Tutorial</a></li>
+ <li><a href="../javadocs/0.9.9" title="Javadocs"><span
class="none"></span>Javadocs</a></li>
+ <li class="nav-header">Recipes</li>
+ <li><a href="recipes/lock_manager.html" title="Distributed lock
manager"><span class="none"></span>Distributed lock manager</a></li>
+ <li><a href="recipes/rabbitmq_consumer_group.html" title="Rabbit MQ
consumer group"><span class="none"></span>Rabbit MQ consumer group</a></li>
+ <li><a href="recipes/rsync_replicated_file_store.html" title="Rsync
replicated file store"><span class="none"></span>Rsync replicated file
store</a></li>
+ <li><a href="recipes/service_discovery.html" title="Service
discovery"><span class="none"></span>Service discovery</a></li>
+ <li><a href="recipes/task_dag_execution.html" title="Distributed task DAG
execution"><span class="none"></span>Distributed task DAG execution</a></li>
+ </ul>
+ </nav>
+ <div class="well sidebar-nav">
+<form id="search-form" action="https://www.google.com/search"; method="get" >
+ <input value="helix.apache.org/0.9.9-docs" name="sitesearch" type="hidden"/>
+ <input class="search-query" name="q" id="query" type="text" />
+</form>
+<script>asyncJs( 'https://cse.google.com/brand?form=search-form' )</script>
+ <hr />
+ <div id="poweredBy">
+ <div class="clear"></div>
+ <div id="twitter" style="border:none; margin-top: 10px">
+ <a href="https://twitter.com/ApacheHelix"; class="twitter-follow-button"
data-show-count="false" data-align="left" data-size="medium"
data-show-screen-name="true" data-lang="en">Follow ApacheHelix</a>
+ <script>!function(d,s,id){var
js,fjs=d.getElementsByTagName(s)[0];if(!d.getElementById(id)){js=d.createElement(s);js.id=id;js.src="//platform.twitter.com/widgets.js";fjs.parentNode.insertBefore(js,fjs);}}(document,"script","twitter-wjs");</script>
+ </div>
+ <div class="clear"></div>
+ <div class="clear"></div>
+<a href="http://maven.apache.org/"; title="Built by Maven"
class="poweredBy"><img class="builtBy" alt="Built by Maven"
src="./images/logos/maven-feather.png" /></a>
+ </div>
+ </div>
+ </header>
+ <main id="bodyColumn" class="span10" >
+<!---
+Licensed to the Apache Software Foundation (ASF) under one
+or more contributor license agreements. See the NOTICE file
+distributed with this work for additional information
+regarding copyright ownership. The ASF licenses this file
+to you under the Apache License, Version 2.0 (the
+"License"); you may not use this file except in compliance
+with the License. You may obtain a copy of the License at
+
+ http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing,
+software distributed under the License is distributed on an
+"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+KIND, either express or implied. See the License for the
+specific language governing permissions and limitations
+under the License.
+-->
+<section>
+<h2><a name="Build_Instructions"></a>Build Instructions</h2><section>
+<h3><a name="From_Source"></a>From Source</h3>
+<p>Requirements: JDK 1.8+, Maven 3.5.0+</p>
+
+<div class="source"><pre class="prettyprint"><code>git clone
https://git-wip-us.apache.org/repos/asf/helix.git
+cd helix
+git checkout tags/helix-0.9.9
+mvn install package -DskipTests
+</code></pre></div></section><section>
+<h3><a name="Maven_Dependency"></a>Maven Dependency</h3>
+
+<div class="source"><pre class="prettyprint"><code><dependency>
+ <groupId>org.apache.helix</groupId>
+ <artifactId>helix-core</artifactId>
+ <version>0.9.9</version>
+</dependency>
+</code></pre></div></section></section>
+ </main>
+ </div>
+ </div>
+ <hr/>
+ <footer>
+ <div class="container-fluid">
+ <div class="row-fluid">
+<div class="row span16"><div>Apache Helix, Apache, the Apache feather logo,
and the Apache Helix project logos are trademarks of The Apache Software
Foundation.
+ All other marks mentioned may be trademarks or registered trademarks
of their respective owners.</div>
+ <a
href="https://helix.apache.org/0.9.9-docs/privacy-policy.html";>Privacy
Policy</a>
+ </div>
+ </div>
+ </div>
+ </footer>
+<script>
+ if(anchors) {
+ anchors.add();
+ }
+</script>
+ </body>
</html>
\ No newline at end of file
Modified: helix/site-content/0.9.9-docs/Features.html
URL:
http://svn.apache.org/viewvc/helix/site-content/0.9.9-docs/Features.html?rev=1900184&r1=1900183&r2=1900184&view=diff
==============================================================================
--- helix/site-content/0.9.9-docs/Features.html (original)
+++ helix/site-content/0.9.9-docs/Features.html Sat Apr 23 04:22:15 2022
@@ -1,200 +1,402 @@
-
<!DOCTYPE html>
+
+
<!--
- Generated by Apache Maven Doxia at 2022-04-23
- Rendered using Maven Reflow Skin 1.0.0
(http://andriusvelykis.github.com/reflow-maven-skin)
+ | Generated by Apache Maven Doxia Site Renderer 1.11.1 from
src/site/markdown/Features.md at 2022-04-23
+ | Rendered using Apache Maven Fluido Skin 1.11.0-SNAPSHOT
+-->
+<html xmlns="http://www.w3.org/1999/xhtml"; lang="en">
+ <head>
+ <meta charset="UTF-8" />
+ <meta name="viewport" content="width=device-width, initial-scale=1" />
+ <meta name="generator" content="Apache Maven Doxia Site Renderer 1.11.1" />
+ <title>Apache Helix – Features</title>
+ <link rel="stylesheet"
href="./css/apache-maven-fluido-1.11.0-SNAPSHOT.min.css" />
+ <link rel="stylesheet" href="./css/site.css" />
+ <link rel="stylesheet" href="./css/print.css" media="print" />
+ <script src="./js/apache-maven-fluido-1.11.0-SNAPSHOT.min.js"></script>
+<script type="text/javascript">
+
+ var _gaq = _gaq || [];
+ _gaq.push(['_setAccount', 'UA-3211522-12']);
+ _gaq.push(['_trackPageview']);
+
+ (function() {
+ var ga = document.createElement('script'); ga.type =
'text/javascript'; ga.async = true;
+ ga.src = ('https:' == document.location.protocol ? 'https://ssl' :
'http://www') + '.google-analytics.com/ga.js';
+ var s = document.getElementsByTagName('script')[0];
s.parentNode.insertBefore(ga, s);
+ })();
+
+ </script>
+ </head>
+ <body class="topBarEnabled">
+ <header id="topbar" class="navbar navbar-fixed-top ">
+ <div class="navbar-inner">
+ <div class="container-fluid">
+ <a data-target=".nav-collapse" data-toggle="collapse" class="btn
btn-navbar">
+ <span class="icon-bar"></span>
+ <span class="icon-bar"></span>
+ <span class="icon-bar"></span>
+ </a>
+ <ul class="nav">
+ <li class="dropdown">
+ <a href="#" class="dropdown-toggle" data-toggle="dropdown">Get Helix
<b class="caret"></b></a>
+ <ul class="dropdown-menu">
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+<section>
+<h2><a name="Features"></a>Features</h2><section>
+<h3><a name="CONFIGURING_IDEALSTATE"></a>CONFIGURING IDEALSTATE</h3>
+<p>Read concepts page for definition of Idealstate.</p>
+<p>The placement of partitions in a DDS is very critical for reliability and
scalability of the system.
+For example, when a node fails, it is important that the partitions hosted on
that node are reallocated evenly among the remaining nodes. Consistent hashing
is one such algorithm that can guarantee this.
+Helix by default comes with a variant of consistent hashing based of the RUSH
algorithm.</p>
+<p>This means given a number of partitions, replicas and number of nodes Helix
does the automatic assignment of partition to nodes such that</p>
+<ul>
+
+<li>Each node has the same number of partitions and replicas of the same
partition do not stay on the same node.</li>
+<li>When a node fails, the partitions will be equally distributed among the
remaining nodes</li>
+<li>When new nodes are added, the number of partitions moved will be minimized
along with satisfying the above two criteria.</li>
+</ul>
+<p>Helix provides multiple ways to control the placement and state of a
replica.</p>
+
+<div class="source"><pre class="prettyprint"><code>
+ |AUTO REBALANCE| AUTO | CUSTOM |
+ -----------------------------------------
+ LOCATION | HELIX | APP | APP |
+ -----------------------------------------
+ STATE | HELIX | HELIX | APP |
+ -----------------------------------------
+</code></pre></div><section>
+<h4><a name="HELIX_EXECUTION_MODE"></a>HELIX EXECUTION MODE</h4>
+<p>Idealstate is defined as the state of the DDS when all nodes are up and
running and healthy.
+Helix uses this as the target state of the system and computes the appropriate
transitions needed in the system to bring it to a stable state.</p>
+<p>Helix supports 3 different execution modes which allows application to
explicitly control the placement and state of the replica.</p><section>
+<h5><a name="AUTO_REBALANCE"></a>AUTO_REBALANCE</h5>
+<p>When the idealstate mode is set to AUTO_REBALANCE, Helix controls both the
location of the replica along with the state. This option is useful for
applications where creation of a replica is not expensive. Example</p>
+
+<div class="source"><pre class="prettyprint"><code>{
+ "id" : "MyResource",
+ "simpleFields" : {
+ "IDEAL_STATE_MODE" : "AUTO_REBALANCE",
+ "NUM_PARTITIONS" : "3",
+ "REPLICAS" : "2",
+ "STATE_MODEL_DEF_REF" : "MasterSlave",
+ }
+ "listFields" : {
+ "MyResource_0" : [],
+ "MyResource_1" : [],
+ "MyResource_2" : []
+ },
+ "mapFields" : {
+ }
+}
+</code></pre></div>
+<p>If there are 3 nodes in the cluster, then Helix will internally compute the
ideal state as</p>
+
+<div class="source"><pre class="prettyprint"><code>{
+ "id" : "MyResource",
+ "simpleFields" : {
+ "NUM_PARTITIONS" : "3",
+ "REPLICAS" : "2",
+ "STATE_MODEL_DEF_REF" : "MasterSlave",
+ },
+ "mapFields" : {
+ "MyResource_0" : {
+ "N1" : "MASTER",
+ "N2" : "SLAVE",
+ },
+ "MyResource_1" : {
+ "N2" : "MASTER",
+ "N3" : "SLAVE",
+ },
+ "MyResource_2" : {
+ "N3" : "MASTER",
+ "N1" : "SLAVE",
+ }
+ }
+}
+</code></pre></div>
+<p>Another typical example is evenly distributing a group of tasks among the
currently alive processes. For example, if there are 60 tasks and 4 nodes,
Helix assigns 15 tasks to each node.
+When one node fails Helix redistributes its 15 tasks to the remaining 3 nodes.
Similarly, if a node is added, Helix re-allocates 3 tasks from each of the 4
nodes to the 5th node.</p></section></section><section>
+<h4><a name="AUTO"></a>AUTO</h4>
+<p>When the idealstate mode is set to AUTO, Helix only controls STATE of the
replicas where as the location of the partition is controlled by application.
Example: The below idealstate indicates thats ‘MyResource_0’ must
be only on node1 and node2. But gives the control of assigning the STATE to
Helix.</p>
+
+<div class="source"><pre class="prettyprint"><code>{
+ "id" : "MyResource",
+ "simpleFields" : {
+ "IDEAL_STATE_MODE" : "AUTO",
+ "NUM_PARTITIONS" : "3",
+ "REPLICAS" : "2",
+ "STATE_MODEL_DEF_REF" : "MasterSlave",
+ }
+ "listFields" : {
+ "MyResource_0" : [node1, node2],
+ "MyResource_1" : [node2, node3],
+ "MyResource_2" : [node3, node1]
+ },
+ "mapFields" : {
+ }
+}
+</code></pre></div>
+<p>In this mode when node1 fails, unlike in AUTO-REBALANCE mode the partition
is not moved from node1 to others nodes in the cluster. Instead, Helix will
decide to change the state of MyResource_0 in N2 based on the system
constraints. For example, if a system constraint specified that there should be
1 Master and if the Master failed, then node2 will be made the new
master.</p></section><section>
+<h4><a name="CUSTOM"></a>CUSTOM</h4>
+<p>Helix offers a third mode called CUSTOM, in which application can
completely control the placement and state of each replica. Applications will
have to implement an interface that Helix will invoke when the cluster state
changes.
+Within this callback, the application can recompute the idealstate. Helix will
then issue appropriate transitions such that Idealstate and Currentstate
converges.</p>
+
+<div class="source"><pre class="prettyprint"><code>{
+ "id" : "MyResource",
+ "simpleFields" : {
+ "IDEAL_STATE_MODE" : "CUSTOM",
+ "NUM_PARTITIONS" : "3",
+ "REPLICAS" : "2",
+ "STATE_MODEL_DEF_REF" : "MasterSlave",
+ },
+ "mapFields" : {
+ "MyResource_0" : {
+ "N1" : "MASTER",
+ "N2" : "SLAVE",
+ },
+ "MyResource_1" : {
+ "N2" : "MASTER",
+ "N3" : "SLAVE",
+ },
+ "MyResource_2" : {
+ "N3" : "MASTER",
+ "N1" : "SLAVE",
+ }
+ }
+}
+</code></pre></div>
+<p>For example, the current state of the system might be
‘MyResource_0’ -> {N1:MASTER,N2:SLAVE} and the application
changes the ideal state to ‘MyResource_0’ ->
{N1:SLAVE,N2:MASTER}. Helix will not blindly issue MASTER–>SLAVE to
N1 and SLAVE–>MASTER to N2 in parallel since it might result in a
transient state where both N1 and N2 are masters.
+Helix will first issue MASTER–>SLAVE to N1 and after its completed
it will issue SLAVE–>MASTER to N2.</p></section></section><section>
+<h3><a name="State_Machine_Configuration"></a>State Machine Configuration</h3>
+<p>Helix comes with 3 default state models that are most commonly used. Its
possible to have multiple state models in a cluster.
+Every resource that is added should have a reference to the state model.</p>
+<ul>
+
+<li>MASTER-SLAVE: Has 3 states OFFLINE,SLAVE,MASTER. Max masters is 1. Slaves
will be based on the replication factor. Replication factor can be specified
while adding the resource</li>
+<li>ONLINE-OFFLINE: Has 2 states OFFLINE and ONLINE. Very simple state model
and most applications start off with this state model.</li>
+<li>LEADER-STANDBY:1 Leader and many stand bys. In general the standby's are
idle.</li>
+</ul>
+<p>Apart from providing the state machine configuration, one can specify the
constraints of states and transitions.</p>
+<p>For example one can say
+Master:1. Max number of replicas in Master state at any time is 1.
+OFFLINE-SLAVE:5 Max number of Offline-Slave transitions that can happen
concurrently in the system</p>
+<p>STATE PRIORITY
+Helix uses greedy approach to satisfy the state constraints. For example if
the state machine configuration says it needs 1 master and 2 slaves but only 1
node is active, Helix must promote it to master. This behavior is achieved by
providing the state priority list as MASTER,SLAVE.</p>
+<p>STATE TRANSITION PRIORITY
+Helix tries to fire as many transitions as possible in parallel to reach the
stable state without violating constraints. By default Helix simply sorts the
transitions alphabetically and fires as many as it can without violating the
constraints.
+One can control this by overriding the priority order.</p></section><section>
+<h3><a name="Config_management"></a>Config management</h3>
+<p>Helix allows applications to store application specific properties. The
configuration can have different scopes.</p>
+<ul>
+
+<li>Cluster</li>
+<li>Node specific</li>
+<li>Resource specific</li>
+<li>Partition specific</li>
+</ul>
+<p>Helix also provides notifications when any configs are changed. This allows
applications to support dynamic configuration changes.</p>
+<p>See HelixManager.getConfigAccessor for more info</p></section><section>
+<h3><a name="Intra_cluster_messaging_api"></a>Intra cluster messaging api</h3>
+<p>This is an interesting feature which is quite useful in practice. Often
times, nodes in DDS requires a mechanism to interact with each other. One such
requirement is a process of bootstrapping a replica.</p>
+<p>Consider a search system use case where the index replica starts up and it
does not have an index. One of the commonly used solutions is to get the index
from a common location or to copy the index from another replica.
+Helix provides a messaging api, that can be used to talk to other nodes in the
system. The value added that Helix provides here is, message recipient can be
specified in terms of resource,
+partition, state and Helix ensures that the message is delivered to all of the
required recipients. In this particular use case, the instance can specify the
recipient criteria as all replicas of P1.
+Since Helix is aware of the global state of the system, it can send the
message to appropriate nodes. Once the nodes respond Helix provides the
bootstrapping replica with all the responses.</p>
+<p>This is a very generic api and can also be used to schedule various
periodic tasks in the cluster like data backups etc.
+System Admins can also perform adhoc tasks like on demand backup or execute a
system command(like rm -rf ;-)) across all nodes.</p>
+
+<div class="source"><pre class="prettyprint"><code>
ClusterMessagingService messagingService = manager.getMessagingService();
+ //CONSTRUCT THE MESSAGE
+ Message requestBackupUriRequest = new Message(
+ MessageType.USER_DEFINE_MSG, UUID.randomUUID().toString());
+ requestBackupUriRequest
+ .setMsgSubType(BootstrapProcess.REQUEST_BOOTSTRAP_URL);
+ requestBackupUriRequest.setMsgState(MessageState.NEW);
+ //SET THE RECIPIENT CRITERIA, All nodes that satisfy the criteria will
receive the message
+ Criteria recipientCriteria = new Criteria();
+ recipientCriteria.setInstanceName("%");
+ recipientCriteria.setRecipientInstanceType(InstanceType.PARTICIPANT);
+ recipientCriteria.setResource("MyDB");
+ recipientCriteria.setPartition("");
+ //Should be processed only the process that is active at the time of
sending the message.
+ //This means if the recipient is restarted after message is sent, it
will not be processed.
+ recipientCriteria.setSessionSpecific(true);
+ // wait for 30 seconds
+ int timeout = 30000;
+ //The handler that will be invoked when any recipient responds to the
message.
+ BootstrapReplyHandler responseHandler = new BootstrapReplyHandler();
+ //This will return only after all recipients respond or after timeout.
+ int sentMessageCount = messagingService.sendAndWait(recipientCriteria,
+ requestBackupUriRequest, responseHandler, timeout);
+</code></pre></div>
+<p>See HelixManager.getMessagingService for more info.</p></section><section>
+<h3><a name="Application_specific_property_storage"></a>Application specific
property storage</h3>
+<p>There are several usecases where applications needs support for distributed
data structures. Helix uses Zookeeper to store the application data and hence
provides notifications when the data changes.
+One value add Helix provides is the ability to specify cache the data and also
write through cache. This is more efficient than reading from ZK every time.</p>
+<p>See HelixManager.getHelixPropertyStore</p></section><section>
+<h3><a name="Throttling"></a>Throttling</h3>
+<p>Since all state changes in the system are triggered through transitions,
Helix can control the number of transitions that can happen in parallel. Some
of the transitions may be light weight but some might involve moving data
around which is quite expensive.
+Helix allows applications to set threshold on transitions. The threshold can
be set at the multiple scopes.</p>
+<ul>
+
+<li>MessageType e.g STATE_TRANSITION</li>
+<li>TransitionType e.g SLAVE-MASTER</li>
+<li>Resource e.g database</li>
+<li>Node i.e per node max transitions in parallel.</li>
+</ul>
+<p>See HelixManager.getHelixAdmin.addMessageConstraint()</p></section><section>
+<h3><a name="Health_monitoring_and_alerting"></a>Health monitoring and
alerting</h3>
+<p>This in currently in development mode, not yet productionized.</p>
+<p>Helix provides ability for each node in the system to report health metrics
on a periodic basis.
+Helix supports multiple ways to aggregate these metrics like simple SUM, AVG,
EXPONENTIAL DECAY, WINDOW. Helix will only persist the aggregated value.
+Applications can define threshold on the aggregate values according to the
SLA's and when the SLA is violated Helix will fire an alert.
+Currently Helix only fires an alert but eventually we plan to use this metrics
to either mark the node dead or load balance the partitions.
+This feature will be valuable in for distributed systems that support
multi-tenancy and have huge variation in work load patterns. Another place this
can be used is to detect skewed partitions and rebalance the cluster.</p>
+<p>This feature is not yet stable and do not recommend to be used in
production.</p></section><section>
+<h3><a name="Controller_deployment_modes"></a>Controller deployment modes</h3>
+<p>Read Architecture wiki for more details on the Role of a controller. In
simple words, it basically controls the participants in the cluster by issuing
transitions.</p>
+<p>Helix provides multiple options to deploy the controller.</p><section>
+<h4><a name="STANDALONE"></a>STANDALONE</h4>
+<p>Controller can be started as a separate process to manage a cluster. This
is the recommended approach. How ever since one controller can be a single
point of failure, multiple controller processes are required for reliability.
+Even if multiple controllers are running only one will be actively managing
the cluster at any time and is decided by a leader election process. If the
leader fails, another leader will resume managing the cluster.</p>
+<p>Even though we recommend this method of deployment, it has the drawback of
having to manage an additional service for each cluster. See Controller As a
Service option.</p></section><section>
+<h4><a name="EMBEDDED"></a>EMBEDDED</h4>
+<p>If setting up a separate controller process is not viable, then it is
possible to embed the controller as a library in each of the
participant.</p></section><section>
+<h4><a name="CONTROLLER_AS_A_SERVICE"></a>CONTROLLER AS A SERVICE</h4>
+<p>One of the cool feature we added in helix was use a set of controllers to
manage a large number of clusters.
+For example if you have X clusters to be managed, instead of deploying X*3(3
controllers for fault tolerance) controllers for each cluster, one can deploy
only 3 controllers. Each controller can manage X/3 clusters.
+If any controller fails the remaining two will manage X/2 clusters. At
LinkedIn, we always deploy controllers in this
mode.</p></section></section></section>
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