Hadoop Distributed File System (HDFS)

Plugin: go.d.plugin Module: hfs

Overview

This collector monitors HDFS nodes.

Netdata accesses HDFS metrics over Java Management Extensions (JMX) through the web interface of an HDFS daemon.

This collector is supported on all platforms.

This collector supports collecting metrics from multiple instances of this integration, including remote instances.

Default Behavior

Auto-Detection

This integration doesn’t support auto-detection.

Limits

The default configuration for this integration does not impose any limits on data collection.

Performance Impact

The default configuration for this integration is not expected to impose a significant performance impact on the system.

Setup

Prerequisites

No action required.

Configuration

File

The configuration file name for this integration is go.d/hdfs.conf.

You can edit the configuration file using the edit-config script from the Netdata config directory.

cd /etc/netdata 2>/dev/null || cd /opt/netdata/etc/netdata
sudo ./edit-config go.d/hdfs.conf

Options

The following options can be defined globally: update_every, autodetection_retry.

Name	Description	Default	Required
update_every	Data collection frequency.	1	False
autodetection_retry	Recheck interval in seconds. Zero means no recheck will be scheduled.	0	False
url	Server URL.	http://127.0.0.1:9870/jmx	True
timeout	HTTP request timeout.	1	False
username	Username for basic HTTP authentication.		False
password	Password for basic HTTP authentication.		False
proxy_url	Proxy URL.		False
proxy_username	Username for proxy basic HTTP authentication.		False
proxy_password	Password for proxy basic HTTP authentication.		False
method	HTTP request method.	GET	False
body	HTTP request body.		False
headers	HTTP request headers.		False
not_follow_redirects	Redirect handling policy. Controls whether the client follows redirects.	no	False
tls_skip_verify	Server certificate chain and hostname validation policy. Controls whether the client performs this check.	no	False
tls_ca	Certification authority that the client uses when verifying the server’s certificates.		False
tls_cert	Client TLS certificate.		False
tls_key	Client TLS key.		False

Examples

Basic

A basic example configuration.

jobs:
  - name: local
    url: http://127.0.0.1:9870/jmx

HTTP authentication

Basic HTTP authentication.

jobs:
  - name: local
    url: http://127.0.0.1:9870/jmx
    username: username
    password: password

HTTPS with self-signed certificate

Do not validate server certificate chain and hostname.

jobs:
  - name: local
    url: https://127.0.0.1:9870/jmx
    tls_skip_verify: yes

Multi-instance

Note: When you define multiple jobs, their names must be unique.

Collecting metrics from local and remote instances.

jobs:
  - name: local
    url: http://127.0.0.1:9870/jmx

  - name: remote
    url: http://192.0.2.1:9870/jmx

Metrics

Metrics grouped by scope.

The scope defines the instance that the metric belongs to. An instance is uniquely identified by a set of labels.

Per Hadoop Distributed File System (HDFS) instance

These metrics refer to the entire monitored application.

This scope has no labels.

Metrics:

Metric	Dimensions	Unit	DataNode	NameNode
hdfs.heap_memory	committed, used	MiB	•	•
hdfs.gc_count_total	gc	events/s	•	•
hdfs.gc_time_total	ms	ms	•	•
hdfs.gc_threshold	info, warn	events/s	•	•
hdfs.threads	new, runnable, blocked, waiting, timed_waiting, terminated	num	•	•
hdfs.logs_total	info, error, warn, fatal	logs/s	•	•
hdfs.rpc_bandwidth	received, sent	kilobits/s	•	•
hdfs.rpc_calls	calls	calls/s	•	•
hdfs.open_connections	open	connections	•	•
hdfs.call_queue_length	length	num	•	•
hdfs.avg_queue_time	time	ms	•	•
hdfs.avg_processing_time	time	ms	•	•
hdfs.capacity	remaining, used	KiB		•
hdfs.used_capacity	dfs, non_dfs	KiB		•
hdfs.load	load	load		•
hdfs.volume_failures_total	failures	events/s		•
hdfs.files_total	files	num		•
hdfs.blocks_total	blocks	num		•
hdfs.blocks	corrupt, missing, under_replicated	num		•
hdfs.data_nodes	live, dead, stale	num		•
hdfs.datanode_capacity	remaining, used	KiB	•
hdfs.datanode_used_capacity	dfs, non_dfs	KiB	•
hdfs.datanode_failed_volumes	failed volumes	num	•
hdfs.datanode_bandwidth	reads, writes	KiB/s	•

Alerts

The following alerts are available:

Alert name	On metric	Description
hdfs_capacity_usage	hdfs.capacity	summary datanodes space capacity utilization
hdfs_missing_blocks	hdfs.blocks	number of missing blocks
hdfs_stale_nodes	hdfs.data_nodes	number of datanodes marked stale due to delayed heartbeat
hdfs_dead_nodes	hdfs.data_nodes	number of datanodes which are currently dead
hdfs_num_failed_volumes	hdfs.num_failed_volumes	number of failed volumes

Troubleshooting

Debug Mode

To troubleshoot issues with the hfs collector, run the go.d.plugin with the debug option enabled. The output should give you clues as to why the collector isn’t working.

Navigate to the plugins.d directory, usually at /usr/libexec/netdata/plugins.d/. If that’s not the case on your system, open netdata.conf and look for the plugins setting under [directories].
```
cd /usr/libexec/netdata/plugins.d/
```
Switch to the netdata user.
```
sudo -u netdata -s
```
Run the go.d.plugin to debug the collector:
```
./go.d.plugin -d -m hfs
```

Industry

Technology

Use cases