Hadoop cluster master server has namenode, two slave servers have DataNode, is that right?

main server jps shows

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DataNodeDataNode

jps:

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dead nodes is displayed as 0

Hadoop linux linux-operation-and-maintenance linux-programming centos
Mar.10,2021

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MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1ea5344-5cb56.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1ea5344-5cb56.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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