How to configure KCL worker properties for Amazon KCL client

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We have a java based KCL worker consuming records from DynamoDB streams. I want to understand based on high number of partition in table and shards in streams, what values should be given while creating worker. Also these tables are actively merging and splitting shards. Asking about following properties (with default values) -

failoverTimeMillis = 10000
shardSyncIntervalMillis = 60000
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