Apache Kudu Configuration
To configure the behavior of each Kudu process, you can pass command-line flags when you start it, or read those options from configuration files by passing them using one or more --flagfile=<file> options. You can even include the --flagfile option within your configuration file to include other files. Learn more about gflags by reading its documentation.
You can place options for masters and tablet servers in the same configuration file, and each will ignore options that do not apply.
Flags can be prefixed with either one or two - characters. This documentation standardizes on two: --example_flag.
Only the most common configuration options are documented in this topic. For a more exhaustive list of configuration options, see the Kudu Configuration Reference. To see all configuration flags for a given executable, run it with the --help option.
Experimental Flags
Some configuration flags are marked 'unsafe' and 'experimental'. Such flags are disabled by default. You can access these flags by enabling the additional flags, --unlock_unsafe_flags and --unlock_experimental_flags. Note that these flags might be removed or modified without a deprecation period or any prior notice in future Kudu releases. Cloudera does not support using unsafe and experimental flags. As a rule of thumb, Cloudera will not support any configuration flags not explicitly documented in the Kudu Configuration Reference Guide.
Configuring the Kudu Master
To see all available configuration options for the kudu-master executable, run it with the --help option:
$ kudu-master --help
| Flag | Valid Options | Default | Description |
|---|---|---|---|
|
--master_addresses |
string |
localhost |
Comma-separated list of all the RPC addresses for Master consensus-configuration. If not specified, assumes a standalone Master. |
|
--fs_data_dirs |
string |
Comma-separated list of directories where the Master will place its data blocks. |
|
|
--fs_wal_dir |
string |
The directory where the Master will place its write-ahead logs. Can be the same as one of the directories listed in --fs_data_dirs, but not a sub-directory of a data directory. |
|
|
--log_dir |
string |
/tmp |
The directory to store Master log files. |
For the complete list of flags for masters, see the Kudu Master Configuration Reference.
Configuring Tablet Servers
To see all available configuration options for the kudu-tserver executable, run it with the --help option:
$ kudu-tserver --help
| Flag | Valid Options | Default | Description |
|---|---|---|---|
|
--fs_data_dirs |
string |
Comma-separated list of directories where the Tablet Server will place its data blocks. |
|
|
--fs_wal_dir |
string |
The directory where the Tablet Server will place its write-ahead logs. Can be the same as one of the directories listed in --fs_data_dirs, but not a sub-directory of a data directory. |
|
|
--log_dir |
string |
/tmp |
The directory to store Tablet Server log files |
|
--tserver_master_addrs |
string |
127.0.0.1:7051 |
Comma separated addresses of the masters that the tablet server should connect to. The masters do not read this flag. |
|
--block_cache_capacity_mb |
integer |
512 |
Maximum amount of memory allocated to the Kudu Tablet Server’s block cache. |
|
--memory_limit_hard_bytes |
integer |
4294967296 |
Maximum amount of memory a Tablet Server can consume before it starts rejecting all incoming writes. |
For the complete list of flags for tablet servers, see the Kudu Tablet Server Configuration Reference.