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      Products

      • Fusion Server 4.2
      • Fusion AI 4.2
      • Fusion App Studio 4.2
      • Fusion Server 4.1
      • Fusion AI 4.1
      • Fusion App Studio 4.1
      • Fusion Server 4.0
      • Fusion AI 4.0
      • Fusion App Studio 4.0
      • Lucidworks Cloud
      • Fusion 3.1
      • Fusion 3.0
      • LucidWorks HDP Search
      • LWS
      • Solr Modules

      Getting Started  (PDF)

      • How Fusion Works
        • Fusion Concepts and Components
        • Getting Data In
        • Getting Data Out
        • Building applications
      • Fusion UI
        • Working with Apps
        • Index Workbench
        • Query Workbench
        • Object Explorer
      • Quickstart
      • Tutorials
        • Get Started with Fusion Server
          • Part 1 - Run Fusion and Create an App
          • Part 2 - Get Data In
          • Part 3 - Get Data Out
          • Part 4 - Improve Relevancy
      • Resources and Support

      Deployment Guide  (PDF)

      • System Requirements
      • Supported Components
      • Deployment Types
      • New Installation
        • Install Fusion on a Single Node
        • Install a Fusion Cluster (Introduction)
        • Install a Fusion Cluster (Unix)
        • Install a Fusion Cluster (Windows)
        • Integrate Fusion with an Existing Solr Deployment
        • Troubleshoot Installation
      • Start and Stop Fusion
      • Directories, Files, and Ports
      • Licensing
      • Upgrade Fusion
        • Upgrade Fusion 3.1.x to 4.1.y
        • Upgrade Fusion 4.0.x to 4.1.y
        • Upgrade Fusion 4.1.x to 4.1.y
        • Troubleshoot Upgrades
      • Add or Move Fusion Nodes
      • Migrate Fusion Objects

      Search Development Guide  (PDF)

      • Getting Data In
        • Connectors
          • Managing Connectors
          • Remote Connectors
          • Developing Custom Connectors
            • Java Connector Development
            • Connectors Security
            • The Random Content Connector
        • Collection Management
          • Collection Management in the Fusion UI
          • Time-Based Partitioning
        • Datasource Configuration
          • Index Pipeline Configuration
            • Index Pipelines
            • Index Profiles
            • Index Pipeline Stages
            • Custom Javascript Indexing Stages
        • Other Ingestion Methods
          • Import Data with the Parallel Bulk Loader
          • Import Data with Hive
          • Import Data with Pig
          • Import Data with the REST API
        • Blob Storage
      • Getting Data Out
        • Query Pipeline Configuration
          • Query Pipelines
          • Query Pipeline Stages
          • Query Profiles
          • Custom Javascript Query Stages
        • Stored Parameters Collection
        • Application Development
          • Autocomplete
          • Faceting
          • Stopwords
          • Synonyms
        • Query Language Cheat Sheet
      • App Management
      • Application Configuration Template Expressions

      System Administration Guide  (PDF)

      • Starting and Stopping
      • Licensing
      • System Usage Monitor
      • System Administration with the Fusion UI
      • Jobs
        • Datasource Jobs
        • Tasks
        • Spark Jobs
      • Security
        • SSL Security (Unix)
        • SSL Security (Windows)
        • Changing a Password
        • Access Control
          • Configuring Fusion for JWT
          • Configuring Fusion for Kerberos
          • Configuring Fusion for LDAP
          • Configuring Fusion for SAML
          • Configuring Fusion for SSO
          • Permissions
          • Roles
          • Secure Communication with a SolrCloud Cluster
          • Security Realms
          • User Access Request Params
          • Users
      • Fusion SQL Service
      • Spark Administration
        • Spark Components
        • Spark Getting Started
        • Spark Driver Processes
        • Spark Configuration
        • Scaling Spark Aggregations
        • Spark Troubleshooting
      • Monitoring
        • Checking System State
        • System Metrics
        • Messaging Services
      • Diagnostic Reports
      • Dashboards
        • Create Dashboards
        • Use Dashboards
        • Manage Dashboards
        • Input Panels
        • Display Panels

      Reference Guides  (PDF)

      • Language Support
      • Connectors
        • Web
        • Database
          • Couchbase
          • JDBC
          • MongoDB
        • Filesystem
          • Local Filesystem
          • Box.com
          • File Upload
          • FTP
          • Google Drive
          • HDFS
          • OneDrive
          • S3
          • SolrXML
          • Windows share (deprecated)
          • Windows share SMB2/3
        • Hadoop Cluster
          • Apache Hadoop 2
          • Cloudera
          • Hortonworks
          • MapR
        • JavaScript
        • Repository
          • Alfresco
          • Azure
          • Confluence
          • Drupal 7.x
          • GitHub
          • JIRA
          • Salesforce
          • ServiceNow
          • SharePoint
          • SharePoint Online
          • Solr
          • Subversion
          • Zendesk
        • Social Media
          • Jive
          • Slack
          • Twitter Search
          • Twitter Stream
      • Parsers
        • Apache Tika Parser
        • Archive Parser
        • CSV Parser
        • Fallback Parser
        • Grok Parser
          • Grok Patterns
        • HTML Parser
        • JSON Parser
        • Text Parser
        • XML Parser
      • Index Pipeline Stages
        • Apache Tika Parser
        • Call Pipeline
        • Date Parsing
        • Detect Language
        • Detect Sentences
        • Exclude Documents
        • Exclusion Filter
        • Field Mapping
        • Field Parser
        • Filter Short Fields
        • Find and Replace
        • Format Signals
        • Gazetteer Lookup Extraction
        • GeoIP Lookup
        • Include Documents
        • Javascript
        • JDBC
        • Logging
        • Machine Learning
        • Managed Javascript
        • OpenNLP NER Extraction
        • Regex Field Extraction
        • Regex Field Filter
        • Regex Field Replacement
        • Resolve Multivalued Fields
        • REST Query
        • Send PagerDuty Message
        • Send Slack Message
        • Send SMTP Email
        • Set Property
        • Solr Dynamic Field Mapping
        • Solr Indexer
        • Solr Partial Update Indexer
        • Tag Part-of-Speech
        • Update Experiment
        • Update Related Document
        • Write Log Message
        • XML Transformation
      • Query Pipeline Stages
        • Active Directory Security Trimming
        • Additional Query Parameters
        • Analytics Catalog
        • Block Documents
        • Boost Documents
        • Boost with Signals
        • Call Pipeline
        • Experiment
        • Facets
        • JavaScript
        • JDBC Lookup
        • Landing Pages
        • Logging
        • Machine Learning
        • Managed Javascript
        • Parameterized Boosting
        • Parameterized Faceting
        • Query Fields
        • Recommend Items for Item
        • Recommend Items for User
        • REST Query
        • Retrieve Stored Parameters
        • Return Query Parameters
        • Rollup Aggregation
        • Security Trimming
        • Send PagerDuty Message
        • Send SMTP Email
        • Send Slack Message
        • Solr Query
        • Solr Subquery
        • Write Log Message
      • Jobs
        • Aggregation Jobs
        • Custom Spark Jobs
        • Log Cleanup Jobs
        • REST Call Jobs
        • Script Jobs
      • REST API Reference
        • Apps API
        • Authentication and Authorization APIs
          • Realms API
          • Roles API
          • Sessions API
          • User API
        • Blob Store API
        • Catalog API
        • Collections API
        • Collection Features API
        • Connector APIs
          • Connector Datasources API
          • Connector History API
          • Connector Jobs API
          • Connector Plugins API
          • Connector Status API
          • Connectors Crawl Database API
        • Groups API
        • Index API
        • Index Pipelines API
        • Index Stages API
        • Index Profiles API
        • Jobs API
        • License API
        • Links API
        • Messaging API
        • Objects API
        • Parsers API
        • Query API
        • Query Pipelines API
        • Query Profiles API
        • Query Stages API
        • Recommendations API
        • Scheduler API
        • Search Cluster API
        • Signals API
        • Solr API
        • SolrAdmin API
        • Solr Configuration API
        • Spark Jobs API
        • Stopwords API
        • Synonyms Editor API
        • System Admin APIs
          • Configurations API
          • History API
          • Nodes API
          • System API
          • Usage API
        • Tasks API
        • Taxonomy API
        • Webapps API
        • ZooKeeper Import/Export API
      • Search Engine and Data Store
        • About This Guide
        • Deployment and Operations
          • Solr Control Script Reference
          • Solr Configuration Files
          • Taking Solr to Production
          • Making and Restoring Backups
          • Running Solr on HDFS
          • SolrCloud on AWS EC2
          • Upgrading a Solr Cluster
            • IndexUpgrader Tool
          • Solr Upgrade Notes
            • Major Changes in Solr 7
            • Major Changes from Solr 5 to Solr 6
        • Using the Solr Administration User Interface
          • Overview of the Solr Admin UI
          • Getting Assistance
          • Logging
          • Cloud Screens
          • Collections / Core Admin
          • Java Properties
          • Thread Dump
          • Suggestions Screen
          • Collection-Specific Tools
            • Analysis Screen
            • Dataimport Screen
            • Documents Screen
            • Files Screen
            • Query Screen
            • Stream Screen
            • Schema Browser Screen
          • Core-Specific Tools
            • Ping
            • Plugins & Stats Screen
            • Replication Screen
            • Segments Info
        • Documents, Fields, and Schema Design
          • Overview of Documents, Fields, and Schema Design
          • Solr Field Types
            • Field Type Definitions and Properties
            • Field Types Included with Solr
            • Working with Currencies and Exchange Rates
            • Working with Dates
            • Working with Enum Fields
            • Working with External Files and Processes
            • Field Properties by Use Case
          • Defining Fields
          • Copying Fields
          • Dynamic Fields
          • Other Schema Elements
          • Schema API
          • Putting the Pieces Together
          • DocValues
          • Schemaless Mode
        • Understanding Analyzers, Tokenizers, and Filters
          • Analyzers
          • About Tokenizers
          • About Filters
          • Tokenizers
          • Filter Descriptions
          • CharFilterFactories
          • Language Analysis
          • Phonetic Matching
          • Running Your Analyzer
        • Searching
          • Overview of Searching in Solr
          • Velocity Search UI
          • Relevance
          • Query Syntax and Parsing
            • Common Query Parameters
            • The Standard Query Parser
            • The DisMax Query Parser
            • The Extended DisMax (eDismax) Query Parser
            • Function Queries
            • Local Parameters in Queries
            • Other Parsers
          • JSON Request API
            • JSON Query DSL
          • JSON Facet API
          • Faceting
            • BlockJoin Faceting
          • Highlighting
          • Spell Checking
          • Query Re-Ranking
            • Learning To Rank
          • Transforming Result Documents
          • Suggester
          • MoreLikeThis
          • Pagination of Results
          • Collapse and Expand Results
          • Result Grouping
          • Result Clustering
          • Spatial Search
          • The Terms Component
          • The Term Vector Component
          • The Stats Component
          • The Query Elevation Component
          • The Tagger Handler
          • Response Writers
            • Velocity Response Writer
          • Near Real Time Searching
          • RealTime Get
          • Exporting Result Sets
          • Streaming Expressions
            • Stream Source Reference
            • Stream Decorator Reference
            • Stream Evaluator Reference
            • Statistical Programming
            • Graph Traversal
          • Parallel SQL Interface
            • Solr JDBC - DbVisualizer
            • Solr JDBC - SQuirreL SQL
            • Solr JDBC - Apache Zeppelin
            • Solr JDBC - Python/Jython
            • Solr JDBC - R
          • Analytics Component
            • Analytics Expression Sources
            • Analytics Mapping Functions
            • Analytics Reduction Functions
        • SolrCloud
          • Getting Started with SolrCloud
          • How SolrCloud Works
            • Shards and Indexing Data in SolrCloud
            • Distributed Requests
            • Time Routed Aliases
          • SolrCloud Resilience
            • SolrCloud Recoveries and Write Tolerance
            • SolrCloud Query Routing And Read Tolerance
          • SolrCloud Configuration and Parameters
            • Setting Up an External ZooKeeper Ensemble
            • Using ZooKeeper to Manage Configuration Files
            • ZooKeeper Access Control
            • Collections API
            • Parameter Reference
            • Command Line Utilities
            • SolrCloud with Legacy Configuration Files
            • Configsets API
          • Rule-based Replica Placement
          • Cross Data Center Replication (CDCR)
            • CDCR Architecture
            • CDCR Configuration
            • Cross Data Center Replication Operations
            • CDCR API
          • SolrCloud Autoscaling
            • Overview of SolrCloud Autoscaling
            • Autoscaling Policy and Preferences
            • SolrCloud Autoscaling Triggers
            • SolrCloud Autoscaling Trigger Actions
            • SolrCloud Autoscaling Listeners
            • SolrCloud Autoscaling Automatically Adding Replicas
            • SolrCloud Autoscaling Fault Tolerance
            • Autoscaling API
        • The Well-Configured Solr Instance
          • Configuring solrconfig.xml
            • DataDir and DirectoryFactory in SolrConfig
            • Lib Directives in SolrConfig
            • Schema Factory Definition in SolrConfig
            • IndexConfig in SolrConfig
            • RequestHandlers and SearchComponents in SolrConfig
            • InitParams in SolrConfig
            • UpdateHandlers in SolrConfig
            • Query Settings in SolrConfig
            • RequestDispatcher in SolrConfig
            • Update Request Processors
            • Codec Factory
          • Solr Cores and solr.xml
            • Format of solr.xml
            • Defining core.properties
            • CoreAdmin API
            • Config Sets
          • Configuration APIs
            • Blob Store API
            • Config API
            • Request Parameters API
            • Managed Resources
          • Implicit RequestHandlers
          • Solr Plugins
            • Adding Custom Plugins in SolrCloud Mode
          • JVM Settings
          • v2 API
        • Monitoring Solr
          • Metrics Reporting
          • Metrics History
          • MBean Request Handler
          • Configuring Logging
          • Using JMX with Solr
          • Monitoring Solr with Prometheus and Grafana
          • Performance Statistics Reference
        • Solr Glossary
      • Data Processing

      Release Notes

      SolrCloud Resilience

      In this section, we’ll cover how does Solr handle reads and writes when all the nodes in the cluster are not healthy

      The following sections cover these topics:

      • SolrCloud Recoveries and Write Tolerance

      • SolrCloud Query Routing And Read Tolerance

      Lucidworks

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