AWS Bedrock embeddings call retry extension (#2917)

* AWS Bedrock embeddings call retry extension

* Removed unnecessary commented line

---------

Co-authored-by: Rok Pajk Kosec <rok.pajkkosec@gmail.com>

packages/components/nodes/embeddings/AWSBedrockEmbedding/AWSBedrockEmbedding.ts

@@ -83,6 +83,24 @@ class AWSBedrockEmbedding_Embeddings implements INode {
                     }
                 ],
                 optional: true
+            },
+            {
+                label: 'Batch Size',
+                name: 'batchSize',
+                description: 'Documents batch size to send to AWS API for Titan model embeddings. Used to avoid throttling.',
+                type: 'number',
+                optional: true,
+                default: 50,
+                additionalParams: true
+            },
+            {
+                label: 'Max AWS API retries',
+                name: 'maxRetries',
+                description: 'This will limit the nubmer of AWS API for Titan model embeddings call retries. Used to avoid throttling.',
+                type: 'number',
+                optional: true,
+                default: 5,
+                additionalParams: true
             }
         ]
     }
@@ -144,7 +162,9 @@ class AWSBedrockEmbedding_Embeddings implements INode {
             if (iModel.startsWith('cohere')) {
                 return await embedTextCohere(documents, client, iModel, inputType)
             } else {
-                return Promise.all(documents.map((document) => embedTextTitan(document, client, iModel)))
+                const batchSize = nodeData.inputs?.batchSize as number
+                const maxRetries = nodeData.inputs?.maxRetries as number
+                return processInBatches(documents, batchSize, maxRetries, (document) => embedTextTitan(document, client, iModel))
             }
         }
         return model
@@ -195,4 +215,38 @@ const embedTextCohere = async (texts: string[], client: BedrockRuntimeClient, mo
     }
 }
 
+const processInBatches = async (
+    documents: string[],
+    batchSize: number,
+    maxRetries: number,
+    processFunc: (document: string) => Promise<number[]>
+): Promise<number[][]> => {
+    let sleepTime = 0
+    let retryCounter = 0
+    let result: number[][] = []
+    for (let i = 0; i < documents.length; i += batchSize) {
+        let chunk = documents.slice(i, i + batchSize)
+        try {
+            let chunkResult = await Promise.all(chunk.map(processFunc))
+            result.push(...chunkResult)
+            retryCounter = 0
+        } catch (e) {
+            if (retryCounter < maxRetries && e.name.includes('ThrottlingException')) {
+                retryCounter = retryCounter + 1
+                i = i - batchSize
+                sleepTime = sleepTime + 100
+            } else {
+                // Split to distinguish between throttling retry error and other errors in trance
+                if (e.name.includes('ThrottlingException')) {
+                    throw new Error('AWS Bedrock retry limit reached: ' + e)
+                } else {
+                    throw new Error(e)
+                }
+            }
+        }
+        await new Promise((resolve) => setTimeout(resolve, sleepTime))
+    }
+    return result
+}
+
 module.exports = { nodeClass: AWSBedrockEmbedding_Embeddings }