hbase-exporter

An HBase Prometheus Exporter

Collects metrics and relays JMX metrics for consumption by Prometheus

Since some important metrics are missing or empty in JMX, we additionally parse the HBase Master UI for e.g. 'Stale regions in transition'

The output of the 'hbase hbck' command is parsed to check for inconsistencies in HBase

Marking Hbase unhealthy requires one of the following conditions to be true

There is at least one stale region in transition
The 'hbase hbck' command shows HBase inconsistencies
A write to the predefined table does not succeed
A ZooKeeper leader can not be determined

Build/Install Dependencies

For python module requirements see requirements.txt

$ sudo dnf/pkg install python3

As the user executing the exporter (e.g. hdfs):

$ sudo su - hdfs
$ pip3 install --user -r requirements.txt

The protobuf compiler is necessary to build the required bindings for Python

Install the protobuf compiler

# FreeBSD
$ sudo pkg install protobuf-c

# Fedora / RHEL / CentOS
$ sudo dnf install protobuf-c protobuf-devel

# Debian / Ubuntu
$ sudo apt install protobuf-compiler libprotobuf-dev

Build the protobuf bindings

To generate the necessary HBase Python Protobuf bindings, run make

$ make

Install the protobuf bindings

$ cp -R hbase-protobuf-python /usr/local/lib

Run

The exporter needs to know about the ZooKeeper servers to connect to, so start the exporter with e.g.

$ PROTOCOL_BUFFERS_PYTHON_IMPLEMENTATION="python" \
  hbase-exporter --zookeeper-server-address=zk-1.acme.internal \
                 --zookeeper-server-address=zk-2.acme.internal \
                 --zookeeper-server-address=zk-3.acme.internal \
                 --export-refresh-rate=60 \
                 --hbck-refresh-rate=1200

or use the systemd-unit and configure the zookeeper servers and refresh rates via the supplied environment file

Run 'hbase-exporter --help' for all arguments

$ hbase-exporter --help
usage: hbase-exporter [-h] [--hbase-master HBASE_MASTER]
                      [--hbase-pseudo-distributed HBASE_PSEUDO_DISTRIBUTED]
                      --hbase-table HBASE_TABLE
                      [--hdfs-namenode HDFS_NAMENODE]
                      --zookeeper-server-address ZK_SERVER
                      [--zookeeper-use-tls ZK_USE_TLS]
                      [--exporter-port PROM_HTTP_PORT]
                      [--export-refresh-rate PROM_EXPORT_INTERVAL_S]
                      [--hbck-refresh-rate HBASE_HBCK_INTERVAL_S]
                      [--relay-jmx RELAY_JMX] [--logfile LOGFILE]
                      [--loglevel LOGLEVEL]

If an arg is specified in more than one place, then commandline values
override environment variables which override defaults.

optional arguments:
  -h, --help            show this help message and exit
  --hbase-master HBASE_MASTER
                        HBase master address, can be specified multiple times
                        [env var: HBASE_MASTER]
  --hbase-pseudo-distributed HBASE_PSEUDO_DISTRIBUTED
                        Indicated whether HBase is run in pdeudo-distributed
                        mode [env var: HBASE_PSEUDO_DISTRIBUTED]
  --hbase-table HBASE_TABLE
                        The HBase table for the write test [env var:
                        HBASE_TABLE]
  --hdfs-namenode HDFS_NAMENODE
                        HDFS namenode address, can be specified multiple times
                        [env var: HDFS_NAMENODE]
  --zookeeper-server-address ZK_SERVER
                        ZooKeeper server address, can be specified multiple
                        times [env var: ZK_SERVER]
  --zookeeper-use-tls ZK_USE_TLS
                        Use TLS when connecting to ZooKeeper [env var:
                        ZK_USE_TLS]
  --exporter-port PROM_HTTP_PORT
                        Listen port for Prometheus export [env var:
                        PROM_HTTP_PORT]
  --export-refresh-rate PROM_EXPORT_INTERVAL_S
                        Time between metrics are gathered in seconds [env var:
                        PROM_EXPORT_INTERVAL_S]
  --hbck-refresh-rate HBASE_HBCK_INTERVAL_S
                        Minimum time between two consecutive hbck runs in
                        seconds [env var: HBASE_HBCK_INTERVAL_S]
  --relay-jmx RELAY_JMX
                        Relay complete JMX data [env var: RELAY_JMX]

Deploy

Ansible can be used to build and deploy the hbase-exporter

$ ansible-playbook -v -i inventory/env.yml deploy-hbase-exporter.yml -l host

Test

To run the tests

$ make test

Debug

To see the log

$ sudo journalctl -afn100 -uhbase-exporter

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