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Today i was going to use a simple sha256 funtion in Hive in order to mask a colunm and aparently in the latest Cloudera distribution the Shipped hive version doesn’t have that native function.
This article will explain how you can build a sha256 or other udfs function and add it in Hive.
Check the following URL in order to see the latest shipped package versions in Cloudera.
CDH 5.12 -> hive-1.1.0+cdh5.12.1+1197
| Return Type | Name(Signature) | Description |
|---|---|---|
| string | sha2(string/binary, int) | Calculates the SHA-2 family of hash functions (SHA-224, SHA-256, SHA-384, and SHA-512) (as of Hive 1.3.0). The first argument is the string or binary to be hashed. The second argument indicates the desired bit length of the result, which must have a value of 224, 256, 384, 512, or 0 (which is equivalent to 256). SHA-224 is supported starting from Java 8. If either argument is NULL or the hash length is not one of the permitted values, the return value is NULL. Example: sha2(‘ABC’, 256) = ‘b5d4045c3f466fa91fe2cc6abe79232a1a57cdf104f7a26e716e0a1e2789df78’. |
this will server more as an exercise, one could create a more complex udf funtion. For the time being let’s create a GenericUDFSha2 based on existing hive 1.3.0 version
You code clone my repo with some udfs-utils here
The original code for hive version 1.3.0 is available in the repo
Let’s create the building structure
Let’s create a pom.xml file
You should obviously change for you packaging namespace, i’m just using com.rramos.bigdata.utils to be simpler.
Next, let’s create the following file
org/apache/hadoop/hive/ql/udf/generic/GenericUDFSha2.java
with the content
And build the package.
After compile you find in target dir the require jar (GenericUDFSha2-1.0-SNAPSHOT.jar) you need to add in Hive.
You should use your Hadoop Distribution instructions for deploying new jars.
Here are Cloudera Instructions.
Next on your Hive session you need to ADD JAR and create a FUNCTION or TEMPORARY FUNCTION
Matthew Rathbone Blog has some great tutorial on Hive Funtions. Take a look if you want to go deep with it.
Cheers,
RR