HDFS is still the king of storage

Michael Amin 2021-02-23 12:07:26
hdfs king storage


learn from from 0 Start learning big data ( Geek time )

1. HDFS framework


DataNode Responsible for the storage of data 、 Reading and writing ,HDFS Divide the file into blocks (Block), Every DataNode Storage part Data blocks , The files are distributed throughout HDFS In server cluster

NameNode Responsible for distributed file system Metadata (MetaData) management , That is to say File pathname The data block ID as well as Storage location Etc , Equivalent to the file allocation table in the operating system (FAT) Role

2. HDFS High availability design

  • Data storage fault tolerance
    Yes DataNode Data blocks on , Compute and store checksums (CheckSum).
    When reading , Recalculate the check sum of the read data , If validation throws an exception , After the program catches the exception, it goes to other DataNode Read the backup data on the

  • Disk fault tolerance
    DataNode A disk of this machine is damaged , Put... Stored on this disk all BlockID Report to NameNode,NameNode Check where DataNode There's a backup on the computer , Copy the backup to another server , Guarantee the number of backups

  • DataNode Fault tolerance
    DataNode Through the heartbeat and NameNode keep signal communication , If DataNode Overtime No heartbeat sent ,NameNode I think DataNode It's down , Search for 、 Copy one to another server

  • NameNode Fault tolerance
    NameNode As a whole HDFS Of The core , Record HDFS File allocation table information , NameNode fault , Whole HDFS System clusters are not available

    Common assurance systems Usability The strategy of :

  • Redundant backup : The data backup , Request distribution to any data center

  • Failover : When data is not accessible , Transfer the request to the server where the backup data is located

  • Degraded current limiting : A large number of requests arrived , Computing resources are limited , Reject part of the request ( Current limiting ), Turn off some functions ( Downgrade ), Like double 11 Turn off evaluation , Guaranteed order function

版权声明
本文为[Michael Amin]所创,转载请带上原文链接,感谢
https://javamana.com/2021/02/20210223120318446r.html

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