Write the command to start and stop the spark in an interactive shell?

251

---

Define various running modes of apache spark?

265

---

What are the ways to run spark over hadoop?

288

---

What is catalyst query optimizer in apache spark?

277

---

What are the various types of shared variable in apache spark?

264

---

Define the common faults of the developer while using apache spark?

271

---

What is the use of spark driver, where it gets executed on the cluster?

325

---

What is speculative execution in spark?

303

---

Explain write ahead log(journaling) in spark?

251

---

Explain values() operation in apache spark?

469

---

Define the level of parallelism and its need in spark streaming?

374

---

Define sparksession in apache spark? Why is it needed?

259

---

Describe different transformations in dstream in apache spark streaming?

282

---

In hadoop_pid_dir, what does pid stands for?

474

---

What are the network requirements for hadoop?

448

---