What is identity mapper and identity reducer?

649

---

What is heartbeat in hdfs? Explain.

687

---

What is identity mapper and chain mapper?

676

---

Name job control options specified by mapreduce.

717

---

What is heartbeat in hdfs?

654

---

What is difference between an input split and hdfs block?

666

---

How do reducers communicate with each other?

676

---

How does inputsplit in mapreduce determines the record boundaries correctly?

652

---

How will you submit extra files or data ( like jars, static files, etc. ) For a mapreduce job during runtime?

664

---

What main configuration parameters are specified in mapreduce?

686

---

How do you stop a running job gracefully?

615

---

Is it necessary to write a mapreduce job in java?

634

---

What is shuffling and sorting in mapreduce?

648

---

What is the function of mapreducer partitioner?

623

---

What is partitioner and its usage?

699

---