THIS IS A TEST INSTANCE. ALL YOUR CHANGES WILL BE LOST!!!!
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- Infers the schema of the Hive table from the Avro schema.
- Reads all Avro files within a table against a specified schema, taking advantage of Avro's backwards compatibility abilities
- Supports arbitrarily nested schemas.
- Translates all Avro data types into equivalent Hive types. Most types map exactly, but some Avro types don't exist in Hive and are automatically converted by the AvroSerde.
- Understands compressed Avro files.
Wiki Markup - Writes any Hive table to Avro files.
- Has worked reliably against our most convoluted Avro schemas in our ETL process.
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Avro type | Becomes Hive type | Note | ||
|---|---|---|---|---|
null | void | |||
boolean | boolean | |||
int | int | |||
long | bigint | |||
float | float | |||
double | double | |||
<ac:structured-macro ac:name="unmigrated-wiki-markup" ac:schema-version="1" ac:macro-id="05bfc783-dbdb-4db2-8bbb-ca4f527d63ee"><ac:plain-text-body><![CDATA[ | bytes | binary | Bytes are converted to Array[smallint] prior to Hive 0.12.0 | ]]></ac:plain-text-body></ac:structured-macro> |
string | string | |||
record | struct | |||
map | map | |||
list | array | |||
<ac:structured-macro ac:name="unmigrated-wiki-markup" ac:schema-version="1" ac:macro-id="bc22734d-99a9-4f74-b532-ca5aabbcee58"><ac:plain-text-body><![CDATA[ | union | union | Unions of [T, null] transparently convert to nullable T, other types translate directly to Hive's unions of those types. However, unions were introduced in Hive 7 and are not currently able to be used in where/group-by statements. They are essentially look-at-only. Because the AvroSerde transparently converts [T,null], to nullable T, this limitation only applies to unions of multiple types or unions not of a single type and null. | ]]></ac:plain-text-body></ac:structured-macro> |
enum | string | Hive has no concept of enums | ||
bytes | binary | Bytes are converted to Array[smallint] prior to Hive 0.12.0 | ||
string | string | |||
record | struct | |||
map | map | |||
list | array | |||
union | union | Unions of [T, null] transparently convert to nullable T, other types translate directly to Hive's unions of those types. However, unions were introduced in Hive 7 and are not currently able to be used in where/group-by statements. They are essentially look-at-only. Because the AvroSerde transparently converts [T,null], to nullable T, this limitation only applies to unions of multiple types or unions not of a single type and null. | ||
enum | string | Hive has no concept of enums <ac:structured-macro ac:name="unmigrated-wiki-markup" ac:schema-version="1" ac:macro-id="5691b988-6b34-483a-9cc1-3ff14d1ddd4b"><ac:plain-text-body><![CDATA[ | ||
fixed | binary | Fixeds are converted to Array[smallint] prior to Hive 0.12.0 ]]></ac:plain-text-body></ac:structured-macro> |
Creating Avro-backed Hive tables
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