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Knowledge Base
Search
- Setup SSL for Solr Cluster with internode and Client-to-node encryption
- DSE Solr indexing performance drop with delete workloads
- 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 See all 32 articles
Install/Upgrade
- FAQ - Is the DataStax Installer no longer available?
- DROP COMPACT STORAGE results in InvalidRequest on older DSE clusters
- Node upgraded from DSE 4.8 to 5.0 fails to start with NPE for LegacySchemaMigrator
- Upgrading to earlier versions of DSE with YUM installs latest version
- Installing earlier versions of DSE installs latest version of OpsCenter agent
- DataStax Academy credentials do not immediately work on DataStax Downloads site See all 12 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
- Nodes report "Unexpected protocol magic number!" error in logs
- Lightweight transactions failing, conditional writes not getting processed
- FAQ - Why Java performance utilities like jps no longer work in DSE 5.0+
- FAQ - Why is forcing major compaction on a table not ideal?
- DSE Advanced Replication reports error while fetching mutations "Could only read 0 but expected 1 bytes"
- DSE Advanced Replication returns UnsupportedMutationException for collection columns See all 130 articles
Analytics
- DSE Spark returns BusyPoolException after upgrade to DSE 5.0.14
- Spark Executor reports CorruptStatistics warnings when reading older Parquet files
- FAQ - Does spark.hadoop.cassandra.host support multiple hosts?
- 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 See all 45 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
- LCM Jobs Fail with: "Cannot find cluster configuration in opscenterd"
- 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 See all 13 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
- LDAP authentication fails in OpsCenter with "'ascii' codec can't encode character"
- OpsCenter API call fails with "InvalidMetric" type
- OpsCenter upgrade to 6.5 does not remove COMPACT STORAGE from tables
- OpsCenter UI fails to load when running on SLES 11.4 See all 49 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
- TransportException on Java driver when running nodetool drain
- 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