Merge pull request #207969 from Clare-Zheng82/0815-Update_ADLS_Gen2_doc

Update blockSizeInMB property in ADLS Gen2 connector doc

Author: v-shils

articles/data-factory/connector-azure-data-lake-storage.md

@@ -8,7 +8,7 @@ ms.service: data-factory
 ms.subservice: data-movement
 ms.topic: conceptual
 ms.custom: synapse
-ms.date: 07/04/2022
+ms.date: 08/15/2022
 ---
 
 # Copy and transform data in Azure Data Lake Storage Gen2 using Azure Data Factory or Azure Synapse Analytics
@@ -427,7 +427,7 @@ The following properties are supported for Data Lake Storage Gen2 under `storeSe
 | ------------------------ | ------------------------------------------------------------ | -------- |
 | type                     | The type property under `storeSettings` must be set to **AzureBlobFSWriteSettings**. | Yes      |
 | copyBehavior             | Defines the copy behavior when the source is files from a file-based data store.<br/><br/>Allowed values are:<br/><b>- PreserveHierarchy (default)</b>: Preserves the file hierarchy in the target folder. The relative path of the source file to the source folder is identical to the relative path of the target file to the target folder.<br/><b>- FlattenHierarchy</b>: All files from the source folder are in the first level of the target folder. The target files have autogenerated names. <br/><b>- MergeFiles</b>: Merges all files from the source folder to one file. If the file name is specified, the merged file name is the specified name. Otherwise, it's an autogenerated file name. | No       |
-| blockSizeInMB | Specify the block size in MB used to write data to ADLS Gen2. Learn more [about Block Blobs](/rest/api/storageservices/understanding-block-blobs--append-blobs--and-page-blobs#about-block-blobs). <br/>Allowed value is **between 4 MB and 100 MB**. <br/>By default, ADF automatically determines the block size based on your source store type and data. For non-binary copy into ADLS Gen2, the default block size is 100 MB so as to fit in at most 4.95-TB data. It may be not optimal when your data is not large, especially when you use Self-hosted Integration Runtime with poor network resulting in operation timeout or performance issue. You can explicitly specify a block size, while ensure blockSizeInMB*50000 is big enough to store the data, otherwise copy activity run will fail. | No |
+| blockSizeInMB | Specify the block size in MB used to write data to ADLS Gen2. Learn more [about Block Blobs](/rest/api/storageservices/understanding-block-blobs--append-blobs--and-page-blobs#about-block-blobs). <br/>Allowed value is **between 4 MB and 100 MB**. <br/>By default, ADF automatically determines the block size based on your source store type and data. For non-binary copy into ADLS Gen2, the default block size is 100 MB so as to fit in at most approximately 4.75-TB data. It may be not optimal when your data is not large, especially when you use Self-hosted Integration Runtime with poor network resulting in operation timeout or performance issue. You can explicitly specify a block size, while ensure blockSizeInMB*50000 is big enough to store the data, otherwise copy activity run will fail. | No |
 | maxConcurrentConnections | The upper limit of concurrent connections established to the data store during the activity run. Specify a value only when you want to limit concurrent connections.| No       |
 | metadata |Set custom metadata when copy to sink. Each object under the `metadata` array represents an extra column. The `name` defines the metadata key name, and the `value` indicates the data value of that key. If [preserve attributes feature](./copy-activity-preserve-metadata.md#preserve-metadata) is used, the specified metadata will union/overwrite with the source file metadata.<br/><br/>Allowed data values are:<br/>- `$$LASTMODIFIED`: a reserved variable indicates to store the source files' last modified time. Apply to file-based source with binary format only.<br/><b>- Expression<b><br/>- <b>Static value<b>| No       |