nodetool getlogginglevels¶

Displays the current logging levels for all loggers.

Synopsis¶

nodetool [connection_options] getlogginglevels

Description¶

nodetool getlogginglevels shows all loggers that have been explicitly configured with non-default logging levels. This includes both levels set at runtime via setlogginglevel and levels configured in logback.xml.

Output Format¶

Logger Name                                  Log Level
ROOT                                         INFO
org.apache.cassandra.db.compaction           DEBUG
org.apache.cassandra.gms                     DEBUG

Examples¶

View Current Levels¶

nodetool getlogginglevels

Filter for Specific Package¶

nodetool getlogginglevels | grep compaction

Check if Debug is Enabled¶

nodetool getlogginglevels | grep DEBUG

Use Cases¶

Verify Debug Settings¶

After enabling debug logging:

# Enable debug
nodetool setlogginglevel org.apache.cassandra.repair DEBUG

# Verify it's set
nodetool getlogginglevels | grep repair

Audit Logging Configuration¶

# See all non-default loggers
nodetool getlogginglevels

Before Node Restart¶

# Document current debug settings (they don't persist)
nodetool getlogginglevels > /tmp/logging_levels_backup.txt

Understanding Output¶

ROOT Logger¶

ROOT                                         INFO

The root logger affects all classes not explicitly configured.

Package Loggers¶

org.apache.cassandra.db                      DEBUG

All classes under this package inherit this level.

Class Loggers¶

org.apache.cassandra.db.compaction.CompactionManager    TRACE

Specific class with its own level.

Common Logger Packages¶

Package	Purpose
`org.apache.cassandra.db`	Database operations
`org.apache.cassandra.db.compaction`	Compaction
`org.apache.cassandra.gms`	Gossip
`org.apache.cassandra.net`	Networking
`org.apache.cassandra.repair`	Repair
`org.apache.cassandra.streaming`	Streaming
`org.apache.cassandra.hints`	Hinted handoff
`org.apache.cassandra.auth`	Authentication
`org.apache.cassandra.transport`	CQL protocol

Workflow: Troubleshooting Session¶

# 1. Check current state
nodetool getlogginglevels

# 2. Enable needed debug levels
nodetool setlogginglevel org.apache.cassandra.repair DEBUG
nodetool setlogginglevel org.apache.cassandra.streaming DEBUG

# 3. Verify enabled
nodetool getlogginglevels

# 4. Debug the issue...

# 5. Reset all debug levels
nodetool setlogginglevel org.apache.cassandra.repair INFO
nodetool setlogginglevel org.apache.cassandra.streaming INFO

# 6. Confirm reset
nodetool getlogginglevels

Scripting Example¶

#!/bin/bash
# check_debug_logging.sh - Alert if debug logging is enabled

DEBUG_COUNT=$(nodetool getlogginglevels | grep -c "DEBUG\|TRACE")

if [ "$DEBUG_COUNT" -gt 0 ]; then
    echo "WARNING: $DEBUG_COUNT logger(s) at DEBUG/TRACE level"
    nodetool getlogginglevels | grep "DEBUG\|TRACE"
else
    echo "OK: No debug logging enabled"
fi

Reset All to Defaults¶

#!/bin/bash
# reset_logging.sh - Reset all loggers to INFO

for logger in $(nodetool getlogginglevels | grep -v "^Logger\|^ROOT" | awk '{print $1}'); do
    echo "Resetting $logger to INFO"
    nodetool setlogginglevel "$logger" INFO
done

Persistence Note¶

Runtime Configuration

Levels shown by getlogginglevels include:

Runtime changes via setlogginglevel (not persisted)
Static configuration from logback.xml (persisted)

After restart, only logback.xml settings remain.

Command	Relationship
setlogginglevel	Change logging levels
info	General node information