Kinesis Firehose在S3中放置JSON对象时不使用分隔符逗号
在发送数据之前,我使用JSON.stringify对数据进行处理,如下所示Kinesis Firehose在S3中放置JSON对象时不使用分隔符逗号,json,amazon-web-services,aws-api-gateway,amazon-kinesis,amazon-kinesis-firehose,Json,Amazon Web Services,Aws Api Gateway,Amazon Kinesis,Amazon Kinesis Firehose,在发送数据之前,我使用JSON.stringify对数据进行处理,如下所示 {"data": [{"key1": value1, "key2": value2}, {"key1": value1, "key2": value2}]} { "key1": value1, "key2": value2 }{ "key1": value1, "key2": value2 } 但一旦它通过AWS API网关,Kinesis Fire
{"data": [{"key1": value1, "key2": value2}, {"key1": value1, "key2": value2}]}
{
"key1": value1,
"key2": value2
}{
"key1": value1,
"key2": value2
}
但一旦它通过AWS API网关,Kinesis Firehose将其置于S3,它看起来是这样的
{"data": [{"key1": value1, "key2": value2}, {"key1": value1, "key2": value2}]}
{
"key1": value1,
"key2": value2
}{
"key1": value1,
"key2": value2
}
JSON对象之间的分隔符逗号消失了,但我需要它来正确处理数据
API网关中的模板:
#set($root = $input.path('$'))
{
"DeliveryStreamName": "some-delivery-stream",
"Records": [
#foreach($r in $root.data)
#set($data = "{
""key1"": ""$r.value1"",
""key2"": ""$r.value2""
}")
{
"Data": "$util.base64Encode($data)"
}#if($foreach.hasNext),#end
#end
]
}
我最近也遇到了同样的问题,我能找到的唯一答案基本上就是在每次将JSON消息发布到Kinesis流时,在每个JSON消息的末尾添加换行符(“\n”),或者使用某种原始JSON解码器方法,可以处理连在一起的JSON对象,而无需分隔符 我发布了一个python代码解决方案,可以在相关的堆栈溢出帖子中找到:
一旦AWS Firehose将JSON对象转储到s3,就完全可以从文件中读取各个JSON对象 使用Python可以使用
json
包中的raw\u decode
函数
from json import JSONDecoder, JSONDecodeError
import re
import json
import boto3
NOT_WHITESPACE = re.compile(r'[^\s]')
def decode_stacked(document, pos=0, decoder=JSONDecoder()):
while True:
match = NOT_WHITESPACE.search(document, pos)
if not match:
return
pos = match.start()
try:
obj, pos = decoder.raw_decode(document, pos)
except JSONDecodeError:
# do something sensible if there's some error
raise
yield obj
s3 = boto3.resource('s3')
obj = s3.Object("my-bukcet", "my-firehose-json-key.json")
file_content = obj.get()['Body'].read()
for obj in decode_stacked(file_content):
print(json.dumps(obj))
# { "key1":value1,"key2":value2}
# { "key1":value1,"key2":value2}
资料来源:
使用胶水/Pyspark您可以使用
import json
rdd = sc.textFile("s3a://my-bucket/my-firehose-file-containing-json-objects")
df = rdd.map(lambda x: json.loads(x)).toDF()
df.show()
来源:
< P>一种方法,你可以考虑通过为你的数据处理器添加一个lambda函数作为数据处理器来配置数据处理,这将在最后将数据传递到S3桶之前执行。DeliveryStream:
...
类型:AWS::KinesisFirehose::DeliveryStream
特性:
DeliveryStreamType:DirectPut
扩展的S3目标配置:
...
巴克特伦:!GetAtt MyDeliveryBucket.Arn
处理配置:
已启用:true
处理器:
-参数:
-参数名称:LambdaArn
参数值:!GetAtt MyTransformDataLambdaFunction.Arn
类型:Lambda
...
在Lambda函数中,确保记录的JSON字符串中追加了'\n'
,请参见Node.js中Lambda函数myTransformData.ts
:
import {
FirehoseTransformationEvent,
FirehoseTransformationEventRecord,
FirehoseTransformationHandler,
FirehoseTransformationResult,
FirehoseTransformationResultRecord,
} from 'aws-lambda';
const createDroppedRecord = (
recordId: string
): FirehoseTransformationResultRecord => {
return {
recordId,
result: 'Dropped',
data: Buffer.from('').toString('base64'),
};
};
const processData = (
payloadStr: string,
record: FirehoseTransformationEventRecord
) => {
let jsonRecord;
// ...
// Process the orginal payload,
// And create the record in JSON
return jsonRecord;
};
const transformRecord = (
record: FirehoseTransformationEventRecord
): FirehoseTransformationResultRecord => {
try {
const payloadStr = Buffer.from(record.data, 'base64').toString();
const jsonRecord = processData(payloadStr, record);
if (!jsonRecord) {
console.error('Error creating json record');
return createDroppedRecord(record.recordId);
}
return {
recordId: record.recordId,
result: 'Ok',
// Ensure that '\n' is appended to the record's JSON string.
data: Buffer.from(JSON.stringify(jsonRecord) + '\n').toString('base64'),
};
} catch (error) {
console.error('Error processing record ${record.recordId}: ', error);
return createDroppedRecord(record.recordId);
}
};
const transformRecords = (
event: FirehoseTransformationEvent
): FirehoseTransformationResult => {
let records: FirehoseTransformationResultRecord[] = [];
for (const record of event.records) {
const transformed = transformRecord(record);
records.push(transformed);
}
return { records };
};
export const handler: FirehoseTransformationHandler = async (
event,
_context
) => {
const transformed = transformRecords(event);
return transformed;
};
一旦新行分隔符就位,像Athena这样的AWS服务将能够正确地处理S3存储桶中的JSON记录数据,而不是其他数据