AWS Glue JSON limit

Trying to use AWS Glue to automatically crawl and catalogue JSON files in an S3 bucket as described here:

https://docs.aws.amazon.com/glue/latest/dg/add-crawler.html

Files smaller than 1mb are successfully catalogued however files greater than 1mb fail to be catalogued and are classified as Unknown.

Have tried approach listed here:
AWS Glue Crawler Classifies json file as UNKNOWN

However makes no difference.

Would love to know if anyone's had similar issues?

asked Nov 20 '18 at 12:10

timothyclifford

4,23533861

add a comment |

Trying to use AWS Glue to automatically crawl and catalogue JSON files in an S3 bucket as described here:

https://docs.aws.amazon.com/glue/latest/dg/add-crawler.html

Files smaller than 1mb are successfully catalogued however files greater than 1mb fail to be catalogued and are classified as Unknown.

Have tried approach listed here:
AWS Glue Crawler Classifies json file as UNKNOWN

However makes no difference.

Would love to know if anyone's had similar issues?

asked Nov 20 '18 at 12:10

timothyclifford

4,23533861

add a comment |

Trying to use AWS Glue to automatically crawl and catalogue JSON files in an S3 bucket as described here:

https://docs.aws.amazon.com/glue/latest/dg/add-crawler.html

Files smaller than 1mb are successfully catalogued however files greater than 1mb fail to be catalogued and are classified as Unknown.

Have tried approach listed here:
AWS Glue Crawler Classifies json file as UNKNOWN

However makes no difference.

Would love to know if anyone's had similar issues?

asked Nov 20 '18 at 12:10

timothyclifford

4,23533861

Trying to use AWS Glue to automatically crawl and catalogue JSON files in an S3 bucket as described here:

https://docs.aws.amazon.com/glue/latest/dg/add-crawler.html

Files smaller than 1mb are successfully catalogued however files greater than 1mb fail to be catalogued and are classified as Unknown.

Have tried approach listed here:
AWS Glue Crawler Classifies json file as UNKNOWN

However makes no difference.

Would love to know if anyone's had similar issues?

amazon-web-services aws-glue

asked Nov 20 '18 at 12:10

timothyclifford

4,23533861

asked Nov 20 '18 at 12:10

timothyclifford

4,23533861

asked Nov 20 '18 at 12:10

timothyclifford

4,23533861

asked Nov 20 '18 at 12:10

timothyclifford

4,23533861

asked Nov 20 '18 at 12:10

timothyclifford

4,23533861

add a comment |

1 Answer
1

active

oldest

votes

I have the same problem. Have you tried flattening the data into ORC or similar? There seems to be a limitation on nested JSON of a certain size, even with custom classifiers. Or you can change your JSON from

[

   { .... },

   { .....},

]

into just

{ ... }

{ ... }

Which should work in Glue.

This is the Python script I ran to get that transformation (worked with a 200 mb JSON):

import json

with open('./Data/data.json') as f:

    data = json.load(f)

with open('./Data/data_flat.json', 'w') as file:

    for entry in data['locations']:

        file.write(json.dumps(entry)+'n')

Now glue correctly Classifies it!

edited Nov 26 '18 at 11:36

answered Nov 26 '18 at 9:36

Finn Ickler

Thanks I will take a look and see if this helps!
– timothyclifford
Nov 27 '18 at 18:15

add a comment |

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1 Answer
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active

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1 Answer
1

active

oldest

votes

[

   { .... },

   { .....},

]

into just

{ ... }

{ ... }

Which should work in Glue.

This is the Python script I ran to get that transformation (worked with a 200 mb JSON):

import json

with open('./Data/data.json') as f:

    data = json.load(f)

with open('./Data/data_flat.json', 'w') as file:

    for entry in data['locations']:

        file.write(json.dumps(entry)+'n')

Now glue correctly Classifies it!

edited Nov 26 '18 at 11:36

answered Nov 26 '18 at 9:36

Finn Ickler

Thanks I will take a look and see if this helps!
– timothyclifford
Nov 27 '18 at 18:15

add a comment |

[

   { .... },

   { .....},

]

into just

{ ... }

{ ... }

Which should work in Glue.

This is the Python script I ran to get that transformation (worked with a 200 mb JSON):

import json

with open('./Data/data.json') as f:

    data = json.load(f)

with open('./Data/data_flat.json', 'w') as file:

    for entry in data['locations']:

        file.write(json.dumps(entry)+'n')

Now glue correctly Classifies it!

edited Nov 26 '18 at 11:36

answered Nov 26 '18 at 9:36

Finn Ickler

Thanks I will take a look and see if this helps!
– timothyclifford
Nov 27 '18 at 18:15

add a comment |

[

   { .... },

   { .....},

]

into just

{ ... }

{ ... }

Which should work in Glue.

This is the Python script I ran to get that transformation (worked with a 200 mb JSON):

import json

with open('./Data/data.json') as f:

    data = json.load(f)

with open('./Data/data_flat.json', 'w') as file:

    for entry in data['locations']:

        file.write(json.dumps(entry)+'n')

Now glue correctly Classifies it!

edited Nov 26 '18 at 11:36

answered Nov 26 '18 at 9:36

Finn Ickler

[

   { .... },

   { .....},

]

into just

{ ... }

{ ... }

Which should work in Glue.

This is the Python script I ran to get that transformation (worked with a 200 mb JSON):

import json

with open('./Data/data.json') as f:

    data = json.load(f)

with open('./Data/data_flat.json', 'w') as file:

    for entry in data['locations']:

        file.write(json.dumps(entry)+'n')

Now glue correctly Classifies it!

edited Nov 26 '18 at 11:36

answered Nov 26 '18 at 9:36

Finn Ickler

edited Nov 26 '18 at 11:36

answered Nov 26 '18 at 9:36

Finn Ickler

answered Nov 26 '18 at 9:36

Finn Ickler

answered Nov 26 '18 at 9:36

Finn Ickler

Thanks I will take a look and see if this helps!
– timothyclifford
Nov 27 '18 at 18:15

add a comment |

Thanks I will take a look and see if this helps!
– timothyclifford
Nov 27 '18 at 18:15

Thanks I will take a look and see if this helps!
– timothyclifford
Nov 27 '18 at 18:15

add a comment |

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