Kinesis / Client / split_shard
Splits a shard into two new shards in the Kinesis data stream, to increase the stream’s capacity to ingest and transport data.
SplitShardis called when there is a need to increase the overall capacity of a stream because of an expected increase in the volume of data records being ingested. This API is only supported for the data streams with the provisioned capacity mode.
When invoking this API, you must use either the
StreamNameparameter, or both. It is recommended that you use the
StreamARNinput parameter when you invoke this API.
You can also use
SplitShardwhen a shard appears to be approaching its maximum utilization; for example, the producers sending data into the specific shard are suddenly sending more than previously anticipated. You can also call
SplitShardto increase stream capacity, so that more Kinesis Data Streams applications can simultaneously read data from the stream for real-time processing.
You must specify the shard to be split and the new hash key, which is the position in the shard where the shard gets split in two. In many cases, the new hash key might be the average of the beginning and ending hash key, but it can be any hash key value in the range being mapped into the shard. For more information, see Split a Shard in the Amazon Kinesis Data Streams Developer Guide.
You can use DescribeStreamSummary and the ListShards APIs to determine the shard ID and hash key values for the
NewStartingHashKeyparameters that are specified in the
SplitShardis an asynchronous operation. Upon receiving a
SplitShardrequest, Kinesis Data Streams immediately returns a response and sets the stream status to
UPDATING. After the operation is completed, Kinesis Data Streams sets the stream status to
ACTIVE. Read and write operations continue to work while the stream is in the
You can use DescribeStreamSummary to check the status of the stream, which is returned in
StreamStatus. If the stream is in the
ACTIVEstate, you can call
If the specified stream does not exist, DescribeStreamSummary returns a
ResourceNotFoundException. If you try to create more shards than are authorized for your account, you receive a
For the default shard limit for an Amazon Web Services account, see Kinesis Data Streams Limits in the Amazon Kinesis Data Streams Developer Guide. To increase this limit, contact Amazon Web Services Support.
If you try to operate on too many streams simultaneously using CreateStream, DeleteStream, MergeShards, and/or SplitShard, you receive a
SplitShardhas a limit of five transactions per second per account.
See also: AWS API Documentation
response = client.split_shard( StreamName='string', ShardToSplit='string', NewStartingHashKey='string', StreamARN='string' )
StreamName (string) – The name of the stream for the shard split.
ShardToSplit (string) –
The shard ID of the shard to split.
NewStartingHashKey (string) –
A hash key value for the starting hash key of one of the child shards created by the split. The hash key range for a given shard constitutes a set of ordered contiguous positive integers. The value for
NewStartingHashKeymust be in the range of hash keys being mapped into the shard. The
NewStartingHashKeyhash key value and all higher hash key values in hash key range are distributed to one of the child shards. All the lower hash key values in the range are distributed to the other child shard.
StreamARN (string) – The ARN of the stream.