cca131 · Hadoop

Configure the Fair Scheduler to resolve application delays

Fair scheduling is a method of assigning resources to applications such that all apps get, on average, an equal share of resources over time. Using fair scheduler we can separate pools(queues) for each team and configure the resources for the pool which will help in overcoming application delays. In the exam you may be asked… Continue reading Configure the Fair Scheduler to resolve application delays

cca131 · Hadoop

Determine reason for application failure

There are many possible causes for a job/application failure varying from code error, environments, files availability, permissions, mapreduce/yarn configuration, resources allocation and even due to server i/o, network issue etc., So the first thing you’ve to do when a job fails is, to look at the error message and correlate with your job. If an… Continue reading Determine reason for application failure

cca131 · Hadoop

Benchmark the cluster (I/O, CPU, network)

Benchmarking is the process of stress testing the resources of the cluster. It’s very useful in understanding the performance of your cluster and to check whether it’s performing as expected before taking it live. Here we are going to test speed in which files are being read/write in HDFS, time taken for mappers/reducers to process… Continue reading Benchmark the cluster (I/O, CPU, network)

cca131 · Hadoop

Resolve performance problems/errors in cluster operation

This is again another scenario based topic. Some of the common performance problems are jobs running slowly, services crash due to out of memory, etc., Example: When I’m adding Yarn roles, one of the node managers failed to start. In this case, we have to identify the cause for the failure. Select Log files dropdown… Continue reading Resolve performance problems/errors in cluster operation

cca131 · Hadoop

Resolve errors/warnings in Cloudera Manager

This is a typical scenario based question and the solution is solely depend upon the errors/warnings appears in the cluster.   Some examples: The warnings could be space issue, service health status, low resources allocations, etc., The errors could be log directories are full, services down and other critical events. In these scenarios, click on… Continue reading Resolve errors/warnings in Cloudera Manager

cca131 · Hadoop

Execute file system commands via HTTPFS

HttpFS is a service that provides HTTP access to HDFS. i.e we can access the HDFS from other filesystems from browsers, and using programming languages. HttpFS has a REST HTTP API supporting all HDFS filesystem operations (both read and write). Using HttpFS, we can Read and write data in HDFS using HTTP utilities (such as… Continue reading Execute file system commands via HTTPFS