What is the speculative execution in hadoop?

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Ranjith N

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Speculative execution in Hadoop is a process of running duplicate tasks on different nodes to finish the job faster by using the result from the task that completes first.
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a mechanism to improve job completion time by running duplicate tasks of slow-performing nodes on faster nodes.
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"Rajesh Kumar N: Guiding Young Minds from 1 to 12 with Expertise and Care"

Speculative Execution in Hadoop: Runs duplicate tasks for slow-running ones. Whichever finishes first, its result is used. Helps avoid delays due to stragglers (slow nodes). Improves overall job performance and reliability. Enabled by default in MapReduce.
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C language Faculty (online Classes )

Apache Hadoop does not fix or diagnose slow-running tasks. Instead, it tries to detect when a task is running slower than expected and launches another, an equivalent task as a backup (the backup task is called as speculative task). This process is called speculative execution in Hadoop.
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C language Faculty (online Classes )

Apache Hadoop does not fix or diagnose slow-running tasks. Instead, it tries to detect when a task is running slower than expected and launches another, an equivalent task as a backup (the backup task is called as speculative task). This process is called speculative execution in Hadoop.
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Related Questions

Can anyone suggest about Hadoop?
Hadoop is good but it depends on your experience. If you don't know basic java, linux, shell scripting. Hadoop is not beneficial for you.
Ajay
How many nodes can be there in a single hadoop cluster?
A single Hadoop cluster can have **thousands of nodes**, depending on hardware and configuration.
Tahir
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Hello, I am Ali from Hyderabad, and I am into Telecom field as a Network Performance Engineer from the past 3 years, and as I don't find any growth in Telecom Field due to stability I am thinking to switch into IT field. And so far whatever I have researched I found Big Data is the demand in IT sector. 1. Can a non-IT guy with no programming/coding knowledge can step into Big Data? 2. How much scope does Big Data have or for how much years can we except Big Data around? 3. If I opt the course into your institute, will there be any real-time exposure during the course? 4. Can I easily get a job into Big Data as I am a non-IT person? And any experts or who have already taken course from any Institution and got helped in getting placements, please do suggest me which would be the best.
Hello Ali, We are from Sgraph Infotech, Bangalore. Bigdata Hadoop is Very good Technology in current market. You can find openings in all the MNC companies. For Bigdata you should have little bit of core...
Ali
I want to pursue career in Data Analyst i.e. Hadoop, currently working in testing professional from last 4 year. Please let me know what�s the opportunity and is my work experience is considerable in Hadoop. Also let me know what need to be prepare for that. Please guide me. Thanks in advance.
Sachin, YEs your work experience will consider as total IT experience. But you need to prepare BigData Hadoop analytic from scratch(start-to end). That means you need to know Hadoop as BigData Hadoop developer...
Sachin
Hello, I have completed B.com , MBA fin & M and 5 yr working experience in SAP PLM 1 - Engineering documentation management 2 - Documentation management Please suggest me which IT course suitable to my career growth and scope in market ? Thanks.
If you think you are strong in finance and costing, I would suggest you a SAP FICO course which is definitely always in demand. if you have an experience as a end user on SAP PLM / Documentation etc, even a course on SAP PLM DMS should be good.
Priya
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