What mode(s) can hadoop code be run in?

496

---

How often do you need to reformat the namenode?

562

---

What is the role of the namenode?

502

---

What happen on the namenode when a client tries to read a data file?

508

---

What is replication factor?

490

---

If the hadoop administrator needs to make a change, which configuration file does he need to change?

501

---

What is distributed copy (distcp)?

531

---

What is the role of the secondary namenode?

487

---

Are there any special requirements for namenode?

466

---

is there a standard procedure to deploy hadoop?

467

---

What happen if a datanode loses network connection for a few minutes?

648

---

What is the procedure for namenode recovery?

496

---

How would an hadoop administrator deploy various components of hadoop in production?

463

---

What happen if one of the datanodes has much slower cpu?

477

---

After increasing the replication level, I still see that data is under replicated. What could be wrong?

515

---