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The old docker is out of date. It is a very old version of docker. You can try installing some other versions of docker too.
Hadoop is one of the simplest data-processing frameworks out there: it was designed for big-data processing on distributed, resource-constrained clusters.
Therefore, hadoop is especially useful for handling large quantities of files, as it automatically distributes data across many nodes.
Hadoop uses the MapReduce paradigm (which also features in Google’s GFS/BigTable), an algorithm for exploiting parallelism in data processing.
The MapReduce concept is based on the idea of dividing your data into a number of “maps”, which perform certain tasks, and a number of “reduces”, which combine the output of the maps into a single result.
In Hadoop parlance, a map takes a block of data (usually around a megabyte) and performs the relevant processing on it, creating a series of smaller blocks of data.
Each map is guaranteed to work on a particular set of blocks of data.
These are then passed to a reduce stage, which collates the results of the individual maps and combines them into a single output block.
The additional data required for a specific map is held in a “context” data structure, which is passed to the map as one of the arguments.
This means that Hadoop runs much more efficiently than, for example, MapReduce on its own, as the context data structure does not need to be copied multiple times.
The implementation of Hadoop on top of the YARN resource manager (or MRv1) is called YARN.
YARN comprises two services:
A resource manager (RM) which provides the management of a cluster of Hadoop nodes. The resource manager is responsible for allocating Hadoop resources to Hadoop processes.
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Use unique system environment variables to set permissions and create an environment for your application to run in. YARN provides the following services:
resource manager (RM) which provides the management of a cluster of Hadoop nodes. The resource manager is responsible for allocating Hadoop resources to Hadoop processes