Describe coalesce() operation. When can you coalesce to a larger number of partitions? Explain.

327

---

When we create an rdd, does it bring the data and load it into the memory?

343

---

What does reduce action do?

273

---

how can you identify whether a given operation is transformation or action?

271

---

Explain the use of broadcast variables

317

---

How do you parse data in xml? Which kind of class do you use with java to pass data?

307

---

Explain sortbykey() operation?

290

---

List various commonly used machine learning algorithm?

371

---

What are the ways in which one can know that the given operation is transformation or action?

274

---

Describe join() operation. How is outer join supported?

288

---

What is the method to create a data frame?

317

---

On what all basis can you differentiate rdd, dataframe, and dataset?

302

---

How can you manually partition the rdd?

299

---

How to create an rdd?

296

---

What is an rdd?

306

---