Dataloss issue with this lambda redshift loader #230
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It is highly likely that your lambda functions were timing out during a long-running COPY operation. Can you please confirm what timeout you were setting? Recommended timeout is 15 minutes. If the COPY command will take longer than 15 minutes, then you either need to load more frequently, or parallelise data loads at the table level. |
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We had set the time out as 15 minutes. There were upto 80 ,( 800) MB files (parquet compressed) created at a point of time loaded using glue batches as input. We experienced the issue during this time mainly.
From: Ian Meyers ***@***.***>
Date: Wednesday, June 9, 2021 at 1:11 AM
To: awslabs/aws-lambda-redshift-loader ***@***.***>
Cc: Priyadarsana, Reji ***@***.***>, Author ***@***.***>
Subject: [EXTERNAL] Re: [awslabs/aws-lambda-redshift-loader] Dataloss issue with this lambda redshift loader (#230)
It is highly likely that your lambda functions were timing out during a long-running COPY operation. Can you please confirm what timeout you were setting? Recommended timeout is 15 minutes. If the COPY command will take longer than 15 minutes, then you either need to load more frequently, or parallelise data loads at the table level.
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And what is the batch load size, and timeout, and how many files are submitted during the timeout interval please? |
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batchTimeoutSecs = 60
batchSize=1
dataFormat=PARQUET
batchSizeBytes=10485760
Glue job- processing hourly data every hour .
Files – max 50 files of 800MB each
From: Ian Meyers ***@***.***>
Date: Wednesday, June 9, 2021 at 8:05 AM
To: awslabs/aws-lambda-redshift-loader ***@***.***>
Cc: Priyadarsana, Reji ***@***.***>, Author ***@***.***>
Subject: [EXTERNAL] Re: [awslabs/aws-lambda-redshift-loader] Dataloss issue with this lambda redshift loader (#230)
And what is the batch load size, and timeout, and how many files are submitted during the timeout interval please?
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And how long does the cluster take to load a single file? |
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On an average the time taken is 4 minutes + , and some of them in the waiting as many files are pushed at the same time.
From: Ian Meyers ***@***.***>
Date: Thursday, June 10, 2021 at 12:26 AM
To: awslabs/aws-lambda-redshift-loader ***@***.***>
Cc: Priyadarsana, Reji ***@***.***>, Author ***@***.***>
Subject: [EXTERNAL] Re: [awslabs/aws-lambda-redshift-loader] Dataloss issue with this lambda redshift loader (#230)
And how long does the cluster take to load a single file?
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OK - so in theory you can go to a batch size of ~3, but would be good to test the runtime of that. Can you please access the lambda logs for a failed load and paste them here? |
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Hi,
We have faced data loss issue with this setup and had to go with a different approach. Looking forward to get the issue fixed.
We have done all the set up and was working fine with relatively less data. We used the reprocessBatch approach for firing the copy command for failed files. It worked well in lower environment . But in production, with the large volume of data we faced dataloss of 850 million record out of 23 billion records. We had made sure that the failed files are reprocessed.
We didn't get any error also.
Thanks
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