This documentation is for an out-of-date version of Apache Flink. We recommend you use the latest stable version.


By default, the Table & SQL API is preconfigured for producing accurate results with acceptable performance.

Depending on the requirements of a table program, it might be necessary to adjust certain parameters for optimization. For example, unbounded streaming programs may need to ensure that the required state size is capped (see streaming concepts).


In every table environment, the TableConfig offers options for configuring the current session.

For common or important configuration options, the TableConfig provides getters and setters methods with detailed inline documentation.

For more advanced configuration, users can directly access the underlying key-value map. The following sections list all available options that can be used to adjust Flink Table & SQL API programs.

Attention Because options are read at different point in time when performing operations, it is recommended to set configuration options early after instantiating a table environment.

// instantiate table environment
TableEnvironment tEnv = ...

// access flink configuration
Configuration configuration = tEnv.getConfig().getConfiguration();
// set low-level key-value options
configuration.setString("", "true");
configuration.setString("", "5 s");
configuration.setString("", "5000");
// instantiate table environment
val tEnv: TableEnvironment = ...

// access flink configuration
val configuration = tEnv.getConfig().getConfiguration()
// set low-level key-value options
configuration.setString("", "true")
configuration.setString("", "5 s")
configuration.setString("", "5000")
# instantiate table environment
t_env = ...

# access flink configuration
configuration = t_env.get_config().get_configuration();
# set low-level key-value options
configuration.set_string("", "true");
configuration.set_string("", "5 s");
configuration.set_string("", "5000");

Attention Currently, key-value options are only supported for the Blink planner.

Execution Options

The following options can be used to tune the performance of the query execution.

Key Default Type Description

Batch Streaming
100 Integer The max number of async i/o operation that the async lookup join can trigger.

Batch Streaming
"3 min" String The async timeout for the asynchronous operation to complete.

(none) String Mainly for testing. A comma-separated list of operator names, each name represents a kind of disabled operator. Operators that can be disabled include "NestedLoopJoin", "ShuffleHashJoin", "BroadcastHashJoin", "SortMergeJoin", "HashAgg", "SortAgg". By default no operator is disabled.

"-1 ms" String The maximum latency can be used for MiniBatch to buffer input records. MiniBatch is an optimization to buffer input records to reduce state access. MiniBatch is triggered with the allowed latency interval and when the maximum number of buffered records reached. NOTE: If is set true, its value must be greater than zero.

false Boolean Specifies whether to enable MiniBatch optimization. MiniBatch is an optimization to buffer input records to reduce state access. This is disabled by default. To enable this, users should set this config to true. NOTE: If mini-batch is enabled, '' and '' must be set.

-1 Long The maximum number of input records can be buffered for MiniBatch. MiniBatch is an optimization to buffer input records to reduce state access. MiniBatch is triggered with the allowed latency interval and when the maximum number of buffered records reached. NOTE: MiniBatch only works for non-windowed aggregations currently. If is set true, its value must be positive.

Batch Streaming
-1 Integer Sets default parallelism for all operators (such as aggregate, join, filter) to run with parallel instances. This config has a higher priority than parallelism of StreamExecutionEnvironment (actually, this config overrides the parallelism of StreamExecutionEnvironment). A value of -1 indicates that no default parallelism is set, then it will fallback to use the parallelism of StreamExecutionEnvironment.

"ALL_EDGES_BLOCKING" String Sets exec shuffle mode.
Accepted values are:
  • ALL_EDGES_BLOCKING: All edges will use blocking shuffle.
  • FORWARD_EDGES_PIPELINED: Forward edges will use pipelined shuffle, others blocking.
  • POINTWISE_EDGES_PIPELINED: Pointwise edges will use pipelined shuffle, others blocking. Pointwise edges include forward and rescale edges.
  • ALL_EDGES_PIPELINED: All edges will use pipelined shuffle.
  • batch: the same as ALL_EDGES_BLOCKING. Deprecated.
  • pipelined: the same as ALL_EDGES_PIPELINED. Deprecated.
Note: Blocking shuffle means data will be fully produced before sent to consumer tasks. Pipelined shuffle means data will be sent to consumer tasks once produced.

Batch Streaming


Possible values: [ERROR, DROP]
The NOT NULL column constraint on a table enforces that null values can't be inserted into the table. Flink supports 'error' (default) and 'drop' enforcement behavior. By default, Flink will check values and throw runtime exception when null values writing into NOT NULL columns. Users can change the behavior to 'drop' to silently drop such records without throwing exception.

true Boolean Whether to asynchronously merge sorted spill files.

-1 Integer Default limit when user don't set a limit after order by. -1 indicates that this configuration is ignored.

128 Integer The maximal fan-in for external merge sort. It limits the number of file handles per operator. If it is too small, may cause intermediate merging. But if it is too large, it will cause too many files opened at the same time, consume memory and lead to random reading.

"-1 ms" String When a source do not receive any elements for the timeout time, it will be marked as temporarily idle. This allows downstream tasks to advance their watermarks without the need to wait for watermarks from this source while it is idle.

"64 kb" String The memory size used to do compress when spilling data. The larger the memory, the higher the compression ratio, but more memory resource will be consumed by the job.

true Boolean Whether to compress spilled data. Currently we only support compress spilled data for sort and hash-agg and hash-join operators.

100000 Integer Sets the window elements buffer size limit used in group window agg operator.

Optimizer Options

The following options can be used to adjust the behavior of the query optimizer to get a better execution plan.

Key Default Type Description

Batch Streaming
"AUTO" String Strategy for aggregate phase. Only AUTO, TWO_PHASE or ONE_PHASE can be set. AUTO: No special enforcer for aggregate stage. Whether to choose two stage aggregate or one stage aggregate depends on cost. TWO_PHASE: Enforce to use two stage aggregate which has localAggregate and globalAggregate. Note that if aggregate call does not support optimize into two phase, we will still use one stage aggregate. ONE_PHASE: Enforce to use one stage aggregate which only has CompleteGlobalAggregate.

1024 Integer Configure the number of buckets when splitting distinct aggregation. The number is used in the first level aggregation to calculate a bucket key 'hash_code(distinct_key) % BUCKET_NUM' which is used as an additional group key after splitting.

false Boolean Tells the optimizer whether to split distinct aggregation (e.g. COUNT(DISTINCT col), SUM(DISTINCT col)) into two level. The first aggregation is shuffled by an additional key which is calculated using the hashcode of distinct_key and number of buckets. This optimization is very useful when there is data skew in distinct aggregation and gives the ability to scale-up the job. Default is false.

Batch Streaming
false Boolean Enables join reorder in optimizer. Default is disabled.

1048576 Long Configures the maximum size in bytes for a table that will be broadcast to all worker nodes when performing a join. By setting this value to -1 to disable broadcasting.

Batch Streaming
true Boolean When it is true, the optimizer will try to find out duplicated table sources and reuse them. This works only when table.optimizer.reuse-sub-plan-enabled is true.

Batch Streaming
true Boolean When it is true, the optimizer will try to find out duplicated sub-plans and reuse them.

Batch Streaming
true Boolean When it is true, the optimizer will push down predicates into the FilterableTableSource. Default value is true.

Table Options

The following options can be used to adjust the behavior of the table planner.

Key Default Type Description

Batch Streaming
false Boolean Enable or disable the OPTIONS hint used to specify table optionsdynamically, if disabled, an exception would be thrown if any OPTIONS hint is specified

Batch Streaming
"default" String The SQL dialect defines how to parse a SQL query. A different SQL dialect may support different SQL grammar. Currently supported dialects are: default and hive