@InterfaceAudience.Public @InterfaceStability.Evolving public abstract class Platform extends Object
HadoopPlatform
 that supports all key types of Hadoop and users could implement their custom
 platform.| Modifier and Type | Field and Description | 
|---|---|
| protected Set<String> | keyClassNames | 
| Constructor and Description | 
|---|
| Platform() | 
| Modifier and Type | Method and Description | 
|---|---|
| protected abstract boolean | define(Class<?> keyComparator)whether it's the platform that has defined a custom Java comparator
 NativeTask doesn't support custom Java comparators
 (set with mapreduce.job.output.key.comparator.class)
 but a platform (e.g Pig) could also set that conf and implement native
 comparators so we shouldn't bail out. | 
| abstract void | init()initialize a platform, where we should call registerKey | 
| abstract String | name() | 
| protected void | registerKey(String keyClassName,
           Class<?> key)associate a key class with its serializer and platform | 
| protected abstract boolean | support(String keyClassName,
       INativeSerializer<?> serializer,
       org.apache.hadoop.mapred.JobConf job)whether a platform supports a specific key should at least satisfy two conditions
 1. | 
public abstract void init()
                   throws IOException
IOExceptionpublic abstract String name()
protected void registerKey(String keyClassName, Class<?> key) throws IOException
keyClassName - map out key class namekey - key serializer classIOExceptionprotected abstract boolean support(String keyClassName, INativeSerializer<?> serializer, org.apache.hadoop.mapred.JobConf job)
INativeComparable interfacekeyClassName - map out put key class nameserializer - serializer associated with key via registerKeyjob - job configurationprotected abstract boolean define(Class<?> keyComparator)
keyComparator - comparator set with mapreduce.job.output.key.comparator.classCopyright © 2008–2023 Apache Software Foundation. All rights reserved.