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Knowledge Base
Search
- Setup SSL for Solr Cluster with internode and Client-to-node encryption
- Solr filter cache hit rate fluctuation post DSE 5.1.6 versions
- Adding a New Search Data Center to Existing Cluster
- FAQ - Does DSE Search support multiple data directories for Solr indexes
- HOW TO - setup Solr Queries to measure percentile latencies
- Search queries do not return map data, results in Cql3CassandraRowReader.java warnings "Cannot find dynamic field" See all 31 articles
Install/Upgrade
- Can't start node with "Unable to activate plugin" after upgrade to DSE 5.1
- Example: Upgrade from 4.0.3 to 4.8.4 - Encrypted Table Issues - Proof of concept
- Installing earlier versions of DSE installs latest version of OpsCenter agent
- DataStax Academy credentials do not immediately work on DataStax Downloads site
- FAQ - Is Amazon Linux a supported platform for DataStax Enterprise?
- "Unable to find property 'threshold_ms'" seen when running upgradesstables See all 9 articles
Graph
- Graph query on gremlin-console returns error "Unable to create an OLAP Traversal Source"
- "Vertex label ID clash" error when loading into DSE Graph
- UnsupportedOperationException when running Vertex query in gremlin console
- or() operator in graph query doesn't use indexes
- Graph loader throws "failed to map segment from shared object" warning
General
- Intermittent gossip issues when using cassandra-topology.properties with GossipingPropertyFileSnitch
- DSE 4.8.5 - Centos 6.7 - What packages are required and what are the dependencies
- Nodes appear unresponsive due to a Linux futex_wait() kernel bug
- Troubleshooting hanging repairs
- Troubleshooting custom logger on Apache Cassandra 2.1
- nodetool fails with: Cannot resolve '127.0.0.1' : unknown host See all 118 articles
Analytics
- Connecting to DSE Spark Hadoop from a client machine
- Spark Master to App disassociation under high load conditions
- Spark Master shuts down during startup with SerialVersionUUID exception
- How To Use Apache Zeppelin with DSE Spark on DSE 5.0.x and 4.8.x
- FAQ - How to connect to DSE 5.0 from R using the Simba driver
- The importance of NTP to spark streaming See all 40 articles
Repair Service
- OpsCenter backup fails with "number of files to be backed up larger than queue size"
- OpsCenter Repair Service attempting to repair a dropped keyspace or table
- Repair service may fail due to lost JMX notifications from Cassandra
- Repair service incorrectly reporting timeout warnings in OpsCenter releases prior to 5.2.3
- Repair service snapshots can cause disk usage growth
- OpsCenter repair service fails See all 7 articles
LCM
- Unexpected Job Status on LCM Clusters
- Lifecycle Manager: Java Install Failure
- LCM Appears to Display Duplicate Clusters
- Lifecycle Manager Error: "meld.core.MeldException: PID file already exists: /var/run/meld.pid"
- Lifecycle Manager issues "--callback-address is required" job error
- Lifecycle Manager: auto_bootstrap null after running configure on an imported cluster See all 12 articles
General
- Example: How to Configure OpsCenter with Active Directory LDAP using sAMAccountName for authentication
- Example: How to Configure OpsCenter with Active Directory LDAP using UID for authentication and no matching sAMAccountName/CN
- Unable to generate Diagnostics Report in OpsCenter 5.2.0 with error "'str' object has no attribute 'role_name'"
- OpsCenter upgrade to 6.5 does not remove COMPACT STORAGE from tables
- OpsCenter UI fails to load when running on SLES 11.4
- OpsCenter 6.0 fails to start on systems with Java 9 See all 46 articles
Backups
- Restoring backups containing data encrypted with system_key
- Clearing out Backups History in OpsCenter 6.0 and 6.1 GUI
- OpsCenter restore for DSE 5.0+ clusters does not revert object permissions
- Backups destination disappeared, scheduled backups stop working
- Opscenter is unable to restore from S3 bucket when the number of backup files is very large
- OpsCenter backup to S3 fails when keyspaces are empty See all 14 articles
Agents
- DataStax agent fails to connect to the local node with ‘Unexpected error connecting to Cassandra , retrying soon , java.lang.NullPointerException'
- Datastax Agent Required Keyspace Permissions
- OpsCenter agent not starting fully when Kerberos authentication is used
- Enabling Agent SSL in LCM-installed clusters
- OpsCenter 6.0 agents unable to save metrics, leads to "OutOfMemoryError"
- AWS ELB idle timeout terminating Opscenter/Agent Stomp connection See all 15 articles
Java
- FAQ - Why does Java driver setFetchSize() return all rows?
- Java driver queries result in "InvalidTypeException: Not enough bytes to deserialize <type>"
- Clients using the java driver seeing "NoHostAvailableException" on nodes that are still reachable
- Java driver executeAsync() threads can still get blocked if polling options are in need of adjustment
- "AlreadyExistsException" seen when creating tables with the Java driver