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2025-09-23 Update From: SLTechnology News&Howtos shulou NAV: SLTechnology News&Howtos > Internet Technology >
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Shulou(Shulou.com)06/03 Report--
1 、 Namenode
Daemon for HDFS
How the file is divided into blocks when recording, and on which nodes these blocks are stored
Centralized management of memory and Icano
It is a single point, and failure will cause the cluster to crash.
2 、 Secondary Namenode
Secondary daemon that monitors the status of HDFS
Each cluster has one.
Communicate with NameNode to save HDFS metadata snapshots regularly
When NameNode fails, it can be used as a backup NameNode.
3 、 DataNode
Each slave server runs one
Responsible for reading and writing HDFS blocks to the local file system
4 、 JobTracker
Daemon for processing jobs (user submitted code)
Decide which files are involved in the processing, then cut the task and assign nodes
Monitor task and restart failed task (at different points)
There is only one JobTracker per cluster, which is located on the Master node
5 、 TaskTracker
Located on the slave node, combined with datanode (principles of code and data)
Manage task on their respective nodes (assigned by jobtracker)
There is only one tasktracker per node, but a tasktracker can start multiple JVM to execute map or reduce tasks in parallel
Interact with jobtracker
1. 6, Master and Slave
Master:Namenode 、 Secondary Namenode 、 jobtracker . Browser (for viewing the management interface), other Hadoop tools
Slave:Tasktracker 、 Datenode
Master is not the only one
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