Below are details pertaining to lab 2.3 Audit the Cluster. I have highlighted a few of the errors. Specifically there are missing services and failed connections. How can I move forward with the lab? Required RPMs: package syslinux is not installed package hdparm is not installed package sdparm is not installed JDK not… Show more
What do you mean by safe mode Problem? How user come out of safe mode in HDFS?
Safe Mode is a state in Hadoop where the HDFS cluster goes in read only mode i.e. no data can be written to the blocks and any deletion or replication of blocks can happen. During this state, the Namenode goes into maintenance mode. The Namenode implicitly goes into this mode at the startup of the HDFS cluster because at startup, the Namenode…
While the bulk load utility exists, there isn't any sort of bulk unload utility to pull data out of a MapRDB table and into another format. Hbase does have a tool that dumps hfiles in to sequence files... it would be nice to dump HFiles in to ORC / Parquet or even csv files... This assumes that you have a known schema for the table and…
What do you mean by small file problem in Hadoop?
Not exactly... You are correct in that HDFS does store the block information in memory on the name node and depending on the amount of memory available the number of blocks is finite and can easily be exceeded. At issue is when you store lots of small files that are much less than the size of a block and these files could normally be joined…
How we can change the replication factor of data which is already stored in HDFS?
Hadoop Distributed File System (HDFS) stores files as data blocks and distributes these blocks across the entire cluster. As HDFS was designed to be fault-tolerant and to run on commodity hardware, blocks are replicated a number of times to ensure high data availability. The replication factor is a property that can be set in the HDFS…
Hi, I passed MCSD exam on 12/05/2017. When will my certificate available in MapR academy profile?
Hi, I'm just getting started learning MapR-DB (otherwise experienced) and I'm running into a bit of trouble right away that I'm unable to overcome. I'm working on the Docker image. Working through the DEV330 lab guide, I'm trying to load the sample data for Lesson 1. After mapr@maprdemo:~$ wget… Show more
I just read the announcement about MapR-XD and Suzy Visvanathan's introduction to the product. It would be great to also have a "MapR-XD Essentials" course to learn a little more about its fundamentals, and the differences with other cloud data stores.
Hello guys, I am working on a use case where trying to stream the records which are in Kafka topics to MapR HBase. And here Kafka and Spark are installed in my local. After running the spark application records from Kafka are not reaching to HBase which is in the server. And below I post my src code and also the logs of MapR zookeeper and… Show more
i have a coupon code, now i would like to give exam for Mapr Administration. please can you share us the steps for exam registration and module question if you have any.
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When DEV 362 - Create Data Pipelines Using Apache Spark (Spark v2.1) will be available? apache spark