配置单元查询失败 BlockMissingException 我发现的根本原因是包含块的数据节点死了。那么，为什么datanode会死机，我该如何修复它呢？
配置单元查询失败

org.apache.tez.dag.app.dag.impl.AMUserCodeException: 
org.apache.hadoop.hdfs.BlockMissingException: Could not obtain block: BLOCK_ABC123 file=/FILELOCATION

Yarn应用程序日志

Could not obtain BLOCK_ABC123 from any node:  
No live nodes contain current block Block locations: 
DatanodeInfoWithStorage[10.100.0.0:30010,DS-dd009c-568-da4b8a661,DISK] 
DatanodeInfoWithStorage[10.100.0.1:30010,DS-db8b97f-3dfsg43ser34,DISK] 
Dead nodes: 
DatanodeInfoWithStorage[10.100.0.0:30010,DS-dd009c-568-da4b8a661,DISK] 
DatanodeInfoWithStorage[10.100.0.1:30010,DS-db8b97f-3dfsg43ser34,DISK]. Will get new block locations from namenode and retry...

datanode也出现了，但我不确定这是否相关。

Xceiver count 1025 exceeds the limit of concurrent xcievers: 1024