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---
id: hdfs_namenode
title: Monitoring HDFS NameNode
sidebar_label: Apache HDFS NameNode
keywords: [big data monitoring system, distributed file system monitoring, HDFS NameNode monitoring]
---
> HertzBeat monitors metrics for HDFS NameNode nodes.
**Protocol Used: HTTP**
## Pre-Monitoring Actions
Ensure that you have obtained the JMX monitoring port for the HDFS NameNode.
## Configuration Parameters
| Parameter Name | Parameter Description |
|-----------------------------|-------------------------------------------------------------------------------------------|
| Target Host | The IPv4, IPv6, or domain name of the target being monitored. Exclude protocol headers. |
| Port | The monitoring port number of the HDFS NameNode, default is 50070. |
| Query Timeout | Timeout for querying the HDFS NameNode, in milliseconds, default is 6000 milliseconds. |
| Metrics Collection Interval | Time interval for collecting monitoring data, in seconds, minimum interval is 30 seconds. |
| Probe Before Monitoring | Whether to probe and check the availability of monitoring before adding it. |
| Description/Remarks | Additional description and remarks for this monitoring. |
### Collected Metrics
#### Metric Set: FSNamesystem
| Metric Name | Metric Unit | Metric Description |
|---------------------------------|-------------|------------------------------------------------------------|
| CapacityTotal | | Total cluster storage capacity |
| CapacityTotalGB | GB | Total cluster storage capacity |
| CapacityUsed | | Used cluster storage capacity |
| CapacityUsedGB | GB | Used cluster storage capacity |
| CapacityRemaining | | Remaining cluster storage capacity |
| CapacityRemainingGB | GB | Remaining cluster storage capacity |
| CapacityUsedNonDFS | | Non-HDFS usage of cluster capacity |
| TotalLoad | | Total client connections in the cluster |
| FilesTotal | | Total number of files in the cluster |
| BlocksTotal | | Total number of BLOCKs |
| PendingReplicationBlocks | | Number of blocks awaiting replication |
| UnderReplicatedBlocks | | Number of blocks with insufficient replicas |
| CorruptBlocks | | Number of corrupt blocks |
| ScheduledReplicationBlocks | | Number of blocks scheduled for replication |
| PendingDeletionBlocks | | Number of blocks awaiting deletion |
| ExcessBlocks | | Number of excess blocks |
| PostponedMisreplicatedBlocks | | Number of misreplicated blocks postponed for processing |
| NumLiveDataNodes | | Number of live data nodes in the cluster |
| NumDeadDataNodes | | Number of data nodes marked as dead |
| NumDecomLiveDataNodes | | Number of decommissioned live nodes |
| NumDecomDeadDataNodes | | Number of decommissioned dead nodes |
| NumDecommissioningDataNodes | | Number of nodes currently being decommissioned |
| TransactionsSinceLastCheckpoint | | Number of transactions since the last checkpoint |
| LastCheckpointTime | | Time of the last checkpoint |
| PendingDataNodeMessageCount | | Number of DATANODE requests queued in the standby namenode |
#### Metric Set: RPC
| Metric Name | Metric Unit | Metric Description |
|--------------------|-------------|---------------------|
| ReceivedBytes | | Data receiving rate |
| SentBytes | | Data sending rate |
| RpcQueueTimeNumOps | | RPC call rate |
#### Metric Set: runtime
| Metric Name | Metric Unit | Metric Description |
|-------------|-------------|--------------------|
| StartTime | | Start time |
#### Metric Set: JvmMetrics
| Metric Name | Metric Unit | Metric Description |
|---------------------------------|--------------|------------------------------------------|
| MemNonHeapUsedM | MB | Current usage of NonHeapMemory by JVM |
| MemNonHeapCommittedM | MB | Committed NonHeapMemory by JVM |
| MemHeapUsedM | MB | Current usage of HeapMemory by JVM |
| MemHeapCommittedM | MB | Committed HeapMemory by JVM |
| MemHeapMaxM | MB | Maximum HeapMemory configured for JVM |
| MemMaxM | MB | Maximum memory that can be used by JVM |
| GcCountParNew | Count | Number of ParNew GC events |
| GcTimeMillisParNew | Milliseconds | Time spent in ParNew GC |
| GcCountConcurrentMarkSweep | Count | Number of ConcurrentMarkSweep GC events |
| GcTimeMillisConcurrentMarkSweep | Milliseconds | Time spent in ConcurrentMarkSweep GC |
| GcCount | Count | Total number of GC events |
| GcTimeMillis | Milliseconds | Total time spent in GC events |
| ThreadsRunnable | Count | Number of threads in RUNNABLE state |
| ThreadsBlocked | Count | Number of threads in BLOCKED state |
| ThreadsWaiting | Count | Number of threads in WAITING state |
| ThreadsTimedWaiting | Count | Number of threads in TIMED WAITING state |