metadata_server

SQream DB’s cluster manager/coordinator is called metadata_server.

In general, you should not need to run metadata_server manually, but it is sometimes useful for testing.

Command Line Arguments

Argument	Default	Description
`--config`	`/home/omert/.sqream/metadata_server_config.json`	The configuration file to use
`--port`	`3105`	The metadata server listening port
`--log_path`	`./metadata_server_log`	The `metadata_server` log file output contains information about the activities and events related to the metadata server of a system.
`--log4_config`	None	Specifies the location of the configuration file for the `Log4cxx` logging library.
`--num_deleters`	1	Specifies the number of threads to use for the file reaper in a system or program.
`--metadata_path`	`<...sqreamd/leveldb>`	Specifies the path to the directory where metadata files are stored for a system or program.
`--help`	None	Used to display a help message or documentation for a particular program or command.

Starting metadata server

Starting temporarily

nohup metadata_server -config ~/.sqream/metadata_server_config.json &
MS_PID=$!

Using nohup and & sends metadata server to run in the background.

Note

Logs are saved to the current directory, under metadata_server_logs.
The default listening port is 3105

Starting temporarily with non-default port

To use a non-default port, specify the logging path as well.

nohup metadata_server --log_path=/home/rhendricks/metadata_logs --port=9241 &
MS_PID=$!

Using nohup and & sends metadata server to run in the background.

Note

Logs are saved to the /home/rhendricks/metadata_logs directory.
The listening port is 9241

Stopping metadata server

To stop metadata server:

kill -9 $MS_PID

Tip

It is safe to stop any SQream DB component at any time using kill. No partial data or data corruption should occur when using this method to stop the process.