Hadoop Mapreduce Flow Custom InputFormat, RecordReader [closed]
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I'm new to Hadoop and currently I'm learning mapreduce design pattern from Donald Miner & Adam Shook MapReduce Design Pattern book. So in this book there is Cartesian Product Join Pattern and it create a custom InputFormat and RecordReader and it makes me confuse about the flow. I have many question about the code :
- Where is InputFormat and RecordReader code actually run? Is it in AppMaster for InputFormat and NodeManager for RecordReader?
- Why is there another InputFormat instance in the CartesianRecordReader? In all MapReduce flow that I found, InputFormat is running before record reader does.
Here is the source code
https://github.com/adamjshook/mapreducepatterns/blob/master/MRDP/src/main/java/mrdp/ch5/CartesianProduct.java
That's all, thanks in advance :)
java hadoop design-patterns mapreduce
closed as too broad by cricket_007, GBlodgett, Graham, Shiladitya, Matthew L Daniel Nov 11 at 5:00
Please edit the question to limit it to a specific problem with enough detail to identify an adequate answer. Avoid asking multiple distinct questions at once. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.
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I'm new to Hadoop and currently I'm learning mapreduce design pattern from Donald Miner & Adam Shook MapReduce Design Pattern book. So in this book there is Cartesian Product Join Pattern and it create a custom InputFormat and RecordReader and it makes me confuse about the flow. I have many question about the code :
- Where is InputFormat and RecordReader code actually run? Is it in AppMaster for InputFormat and NodeManager for RecordReader?
- Why is there another InputFormat instance in the CartesianRecordReader? In all MapReduce flow that I found, InputFormat is running before record reader does.
Here is the source code
https://github.com/adamjshook/mapreducepatterns/blob/master/MRDP/src/main/java/mrdp/ch5/CartesianProduct.java
That's all, thanks in advance :)
java hadoop design-patterns mapreduce
closed as too broad by cricket_007, GBlodgett, Graham, Shiladitya, Matthew L Daniel Nov 11 at 5:00
Please edit the question to limit it to a specific problem with enough detail to identify an adequate answer. Avoid asking multiple distinct questions at once. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.
add a comment |
up vote
1
down vote
favorite
up vote
1
down vote
favorite
I'm new to Hadoop and currently I'm learning mapreduce design pattern from Donald Miner & Adam Shook MapReduce Design Pattern book. So in this book there is Cartesian Product Join Pattern and it create a custom InputFormat and RecordReader and it makes me confuse about the flow. I have many question about the code :
- Where is InputFormat and RecordReader code actually run? Is it in AppMaster for InputFormat and NodeManager for RecordReader?
- Why is there another InputFormat instance in the CartesianRecordReader? In all MapReduce flow that I found, InputFormat is running before record reader does.
Here is the source code
https://github.com/adamjshook/mapreducepatterns/blob/master/MRDP/src/main/java/mrdp/ch5/CartesianProduct.java
That's all, thanks in advance :)
java hadoop design-patterns mapreduce
I'm new to Hadoop and currently I'm learning mapreduce design pattern from Donald Miner & Adam Shook MapReduce Design Pattern book. So in this book there is Cartesian Product Join Pattern and it create a custom InputFormat and RecordReader and it makes me confuse about the flow. I have many question about the code :
- Where is InputFormat and RecordReader code actually run? Is it in AppMaster for InputFormat and NodeManager for RecordReader?
- Why is there another InputFormat instance in the CartesianRecordReader? In all MapReduce flow that I found, InputFormat is running before record reader does.
Here is the source code
https://github.com/adamjshook/mapreducepatterns/blob/master/MRDP/src/main/java/mrdp/ch5/CartesianProduct.java
That's all, thanks in advance :)
java hadoop design-patterns mapreduce
java hadoop design-patterns mapreduce
edited Nov 13 at 16:14
asked Nov 9 at 16:07
Irvan
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3617
closed as too broad by cricket_007, GBlodgett, Graham, Shiladitya, Matthew L Daniel Nov 11 at 5:00
Please edit the question to limit it to a specific problem with enough detail to identify an adequate answer. Avoid asking multiple distinct questions at once. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.
closed as too broad by cricket_007, GBlodgett, Graham, Shiladitya, Matthew L Daniel Nov 11 at 5:00
Please edit the question to limit it to a specific problem with enough detail to identify an adequate answer. Avoid asking multiple distinct questions at once. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.
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