100 KB Avro sample file
An Avro file of exactly 102,400 bytes. It is a valid Apache Avro object container file file, generated for this site and checked with an independent parser. Use it wherever you need a 100 KB sample, test or dummy Avro file.
Download
sample-avro-100kb.avro
100 KB102,400 bytes
Download 100 KB AvroDirect download. No sign-up and no waiting.
- Type
- application/avro
- SHA-256
ae085a78a8b087083c1b283361d309c2d178d92446e2c0b3735f703a2150ca7f- Direct URL
https://www.sampletestfiles.com/downloads/avro/sample-avro-100kb.avro
What is in this file
An object container file whose header carries the writer schema as JSON, followed by 841 binary-encoded customer records in 9 blocks. 42 bytes of filler in an extra header metadata entry, which readers ignore, bring the file to the exact size.
| Records | 841 |
|---|---|
| Blocks | 9, of up to 100 records |
| Schema | Customer record, 12 fields |
| Types used | long, string, double, boolean, enum, union, and the uuid and date logical types |
| Codec | null (not compressed) |
| Sync marker | 16 bytes after every block |
First bytes of the file
The first 64 bytes of sample-avro-100kb.avro as a hex dump: offset, bytes, then the same bytes as text. The Avro signature is 4F 62 6A 01.
00000000 4f 62 6a 01 06 16 61 76 72 6f 2e 73 63 68 65 6d |Obj...avro.schem|
00000010 61 d0 0a 7b 22 74 79 70 65 22 3a 22 72 65 63 6f |a..{"type":"reco|
00000020 72 64 22 2c 22 6e 61 6d 65 22 3a 22 43 75 73 74 |rd","name":"Cust|
00000030 6f 6d 65 72 22 2c 22 6e 61 6d 65 73 70 61 63 65 |omer","namespace|Preview
Avro files cannot be shown in a browser. Download the file and open it in an application that reads Avro, such as Apache Spark, Flink and Hive.
Where 100 KB matters
A 102,400-byte file that sits exactly on the default request-body limit of Express. These are the default limits a file of this size is useful for testing:
| System | Limit | Note |
|---|---|---|
| Express body parsers | 100 KB (102,400 bytes) by default | A request body of exactly this size passes; anything larger returns 413 Payload Too Large. |
| Gmail message clipping | About 102 KB of HTML | Longer messages are truncated behind a "view entire message" link. |
| Amazon DynamoDB items | 400 KB per item | 100 KB fits; the 500 KB sample does not. |
Use this file for
- Checking email size handling
- Checking schema resolution between a writer and a reader
- Verifying handling of logical types such as dates and UUIDs
Testing notes for Avro
- No media type is registered for Avro, so files arrive labelled application/octet-stream as often as anything else. Detection has to rely on the four signature bytes.
- A logical type is an annotation on a plain type: a date is stored as an int counting days since 1970. A reader that ignores the annotation returns a number where a date was expected.
Technical details
| File name | sample-avro-100kb.avro |
|---|---|
| Format | Avro (Apache Avro object container file) |
| Extension | .avro |
| MIME type | application/avro |
| Size | 102,400 bytes (100 KB) |
| Kind | Binary |
| Signature | 4F 62 6A 01 |
| SHA-256 | ae085a78a8b087083c1b283361d309c2d178d92446e2c0b3735f703a2150ca7f |
| Created | 2026-10-10 |
| Validation | Exact size, signature bytes and structure checked when the file was generated |
| Preview | Not available for this file; details only |
| Source | Generated for this site; not copied from elsewhere |
| Licence | Free to use, modify and redistribute (terms) |
| Category | Data |
Validated for expected format and integrity. As with any download, scan the file with your own security tools before opening it. How files are made and checked
Download from the command line and verify
Fetch the file with curl, then compare its checksum with the SHA-256 value above.
curl -o sample-avro-100kb.avro 'https://www.sampletestfiles.com/downloads/avro/sample-avro-100kb.avro'
sha256sum sample-avro-100kb.avro # Linux
shasum -a 256 sample-avro-100kb.avro # macOSOn Windows, run Get-FileHash sample-avro-100kb.avro -Algorithm SHA256 in PowerShell. A matching value proves that the download is complete and unaltered.
Related files
Questions about this file
- Is this file exactly 100 KB?
- Yes. It is 102,400 bytes, which is 100 KB in the binary units that operating systems and server limits use (1 KB = 1,024 bytes).
- What is inside the 100 KB Avro file?
- An object container file whose header carries the writer schema as JSON, followed by 841 binary-encoded customer records in 9 blocks. 42 bytes of filler in an extra header metadata entry, which readers ignore, bring the file to the exact size.
- Are the Avro samples compressed?
- No. They use the "null" codec, which every Avro library is required to support, so the records can also be inspected in a hex viewer.