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How can we assure that the values regarding a particular key goes to the same reducer?
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What is the difference between Reducer and Combiner in Hadoop MapReduce?
If reducers do not start before all mappers finish then why does the progress on mapreduce job shows something like map(50%) reduce(10%)? Why reducers progress percentage is displayed when mapper is not finished yet?
Explain combiners.
What is the best way to copy files between HDFS clusters?
Explain about the basic parameters of mapper and reducer function
What is heartbeat in hdfs?
What is shuffling and sorting in Hadoop MapReduce?
Explain what are the basic parameters of a mapper?
Define MapReduce?
MapReduce Types and Formats and Setting up a Hadoop Cluster?
What is the Hadoop MapReduce API contract for a key and value Class?
How many Reducers run for a MapReduce job in Hadoop?
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Apache Hadoop (394) - MapReduce (354)
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- Apache Pig (225)
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- Apache ZooKeeper (65)
- Apache Ambari (93)
- Apache HCatalog (34)
- Apache HDFS Hadoop Distributed File System (214)
- Apache Kafka (189)
- Apache Avro (26)
- Apache Presto (15)
- Apache Tajo (26)
- Hadoop General (407)
