History Server #
Flink has a history server that can be used to query the statistics of completed jobs after the corresponding Flink cluster has been shut down.
Furthermore, it exposes a REST API that accepts HTTP requests and responds with JSON data.
The HistoryServer allows you to query the status and statistics of completed jobs that have been archived by a JobManager.
After you have configured the HistoryServer and JobManager, you start and stop the HistoryServer via its corresponding startup script:
# Start or stop the HistoryServer bin/historyserver.sh (start|start-foreground|stop)
By default, this server binds to
localhost and listens at port
Currently, you can only run it as a standalone process.
The configuration keys
historyserver.archive.fs.refresh-interval need to be adjusted for archiving and displaying archived jobs.
The archiving of completed jobs happens on the JobManager, which uploads the archived job information to a file system directory. You can configure the directory to archive completed jobs in
flink-conf.yaml by setting a directory via
# Directory to upload completed job information jobmanager.archive.fs.dir: hdfs:///completed-jobs
The HistoryServer can be configured to monitor a comma-separated list of directories in via
historyserver.archive.fs.dir. The configured directories are regularly polled for new archives; the polling interval can be configured via
# Monitor the following directories for completed jobs historyserver.archive.fs.dir: hdfs:///completed-jobs # Refresh every 10 seconds historyserver.archive.fs.refresh-interval: 10000
The contained archives are downloaded and cached in the local filesystem. The local directory for this is configured via
Check out the configuration page for a complete list of configuration options.
Available Requests #
Below is a list of available requests, with a sample JSON response. All requests are of the sample form
http://hostname:8082/jobs, below we list only the path part of the URLs.
Values in angle brackets are variables, for example
http://hostname:port/jobs/<jobid>/exceptions will have to requested for example as