How does speculative execution work in Hadoop?

232

List out the different stream grouping in apache storm?

217

How can you set an arbitrary number of mappers to be created for a job in Hadoop?

268

Suppose hadoop spawned 100 tasks for a job and one of the tasks failed. What will hadoop do?

278

After the Map phase finishes, the Hadoop framework does 'Partitioning, Shuffle and sort'. Explain what happens in this phase?

293

what happens when namenode goes down during file read operation in hadoop?

320

Why do we need Hadoop?

235

What are the port numbers of namenode?

216

How can native libraries be included in yarn jobs?

250

Can you define udf?

225

What is a commodity hardware? Does commodity hardware include RAM?

267

What are the different commands used to startup and shutdown Hadoop daemons?

243

How NameNode tackle Datanode failures in Hadoop?

234

Which operating system(s) are supported for production hadoop deployment?

244

Define “speculative execution” in hadoop?

233