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- The validation job will never delete records from target i.e. it only adds or updates data on target
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# Migrating or Validating specific partition ranges
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- You can also use the tool to Migrate or Validate specific partition ranges by using a partition-file with the name `./<keyspace>.<tablename>_partitions.csv` in the below format in the current folder as input
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- You can also use the tool to Migrate or Validate specific partition ranges by using a partition-file with the name `./<keyspacename>.<tablename>_partitions.csv` in the below format in the current folder as input
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```
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-507900353496146534,-107285462027022883
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-506781526266485690,1506166634797362039
@@ -94,21 +94,21 @@ Each line above represents a partition-range (`min,max`). Alternatively, you can
This mode is specifically useful to processes a subset of partition-ranges that may have failed during a previous run.
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> **Note:**
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> A file named `./<keyspace>.<tablename>_partitions.csv` is auto generated by the Migration & Validation jobs in the above format containing any failed partition ranges. No file is created if there are no failed partitions. You can use this file as an input to process any failed partition in a following run.
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> A file named `./<keyspacename>.<tablename>_partitions.csv` is auto generated by the Migration & Validation jobs in the above format containing any failed partition ranges. No file is created if there are no failed partitions. You can use this file as an input to process any failed partition in a following run.
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# Perform large-field Guardrail violation checks
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- The tool can be used to identify large fields from a table that may break you cluster guardrails (e.g. AstraDB has a 10MB limit for a single large field) `--class com.datastax.cdm.job.GuardrailCheck` as shown below
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