The number of concurrent extractors in a CDM migration job is related to the cluster specifications and table size. The value range is 1 to 300. If the value is too large, the extractors are queued.
You are advised to set 4 concurrent extractors for each 1 CU (1 CU = 1 vCPU and 4 GB), as listed in Table 1. You can also adjust the value as needed. If each row of the table contains less than or equal to 1 MB data, you can extract data concurrently. If each row contains more than 1 MB data, you are advised to extract data in a single thread.
- When data is to be migrated to files, CDM does not support multiple concurrent tasks. In this case, set a single process to extract data.
- The number of concurrent extractors of a job is affected by Maximum Concurrent Extractors configured on the Settings page. The Maximum Concurrent Extractors parameter specifies the total number of concurrent extractions.