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From "Rahul Challapalli (JIRA)" <>
Subject [jira] [Commented] (BLUR-251) Create table level third party field types
Date Tue, 22 Oct 2013 08:23:42 GMT


Rahul Challapalli commented on BLUR-251:

Hi Aaron,

I would like to work on this issue unless someone else is already working. 

Below are few of my thoughts

Thrift Interface : 
public void addCustomFieldTypeToTable(String tablename, String fieldTypeName, ByteBuffer jarByteBuffer);
public void addCustomFieldTypeToCluster(String cluster, String fieldTypeName, ByteBuffer jarByteBuffer);

"fieldTypeName" should be same as the one specified in the or tabledescriptor
We can name the jar file as fieldTypeName.jar on the shard server so that we can load it using
an URL class loader
What is the appropriate location on the shard server to place the jar file? (Cluster level
and Table specific)

We can use the below code to load the new type :
Class<? extends FieldTypeDefinition> clazz;
try {
  // new type class already available in classpath of shard server (manually added in shard
server classpath before server start)
  clazz = (Class<? extends FieldTypeDefinition>) Class.forName("org.apache.blur.analysis.type.MyCustomField");
catch (ClassNotFoundException cnfe) {
   * In the TableContext we cannot say whether a new FieldType is table level or cluster level
as we 
   * merge new FieldType's from TableDescriptor into blurConfiguration. 
   * So we might need to check whether the jar file fieldTypeName.jar is present in the cluster
wide location or table specific location
   * create a URL classloader based on the location
  File typeJar = new File("path/to/jar");
  URLClassLoader urlClassLoader = new URLClassLoader (new URL[]{typeJar.toURI().toURL()});
  clazz = (Class<? extends FieldTypeDefinition>) Class.forName("org.apache.blur.analysis.type.MyCustomField",
true, urlClassLoader);

Also can you elaborate on the difference between blurConfiguration, configuration, systemBlurConfiguration
and systemConfiguration in TableContext?

Let me know your thoughts?

> Create table level third party field types
> ------------------------------------------
>                 Key: BLUR-251
>                 URL:
>             Project: Apache Blur
>          Issue Type: Sub-task
>          Components: Blur
>    Affects Versions: 0.3.0, 0.2.1
>            Reporter: Aaron McCurry
>             Fix For: 0.3.0
> Allow for dynamically adding new field types to a given table.  Each type will have it's
own class loader and will load the jar files from a location within the table's storage directory.
 When the type is created the jars files will be copied from their location into the table
storage so that they can live with the table and are effectively immutable.  This will require
new methods in the Blur Thrift API.

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