Impala coordinator Startup flags

On startup, each Impala coordinator runs an SQL statement to create the query logging tables. The following table lists the Impala startup coordinator flags that you can configure:

Name	Data Type	Default	Description
cluster_id	string		Specifies an identifier string that uniquely represents this cluster. This identifier is included in both the tables and is used as a table partition for the sys.impala_query_log table.
query_log_shutdown_timeout_s	number (seconds)	30	Hidden flag. Number of seconds to wait for the queue of completed queries to be carried into the query history table before timing out and continuing the shutdown process.The query history table drain process runs after the shutdown process completes, therefore the max shutdown time is extended by the value specified in this flag.
workload_mgmt_user	string	impala	Specifies the user that will be used to insert records into the query history table.
query_log_write_interval_s	number (seconds)	300	Number of seconds to wait before inserting completed queries into the query history table. Allows for batching inserts to help avoid small files.
query_log_max_queued	number	3000	Maximum number of completed queries that can be queued before they are written to the query history table.This flag operates independently of the query_log_write_interval_m flag. If the number of queued records reaches this value, the records will be written to the query log table no matter how much time has passed since the last write.A value of 0 indicates no maximum number of queued records.
query_log_max_sql_length	number	16777216	Maximum length of a SQL statement that will be recorded in the completed queries table. If a SQL statement with a length longer than this specified value is executed, the SQL inserted into the completed queries table will be trimmed to this length. Any characters that require escaping will have their backslash character counted towards this limit.
query_log_max_plan_length	number	16777216	Maximum length of the SQL query plan that will be recorded in the completed queries table. If a query plan has a length longer than this value, the plan inserted into the completed queries table will be trimmed to this length. Any characters that require escaping will have their backslash character counted towards this limit.
query_log_request_pool	string		Specifies a pool or queue used by the queries that insert into the query log table. Empty value causes no pool to be set.
query_log_dml_exec_timeout_s	number	120	Specifies the value of the EXEC_TIME_LIMIT_S query option on the DML that inserts records into the sys.impala_query_log table.