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DataNode communicate with NameNode
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Jiang Yu
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how DataNode communicate with NameNode and some internal structure of NameNode
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DataNode communicate with NameNode
1.
NameNode与 DataNode通信
2.
Protocol • register: handshake,register
when startup • heartbeat: liveness,capacity,used,remaining. short time 3s default • blockreport: diff. long time 6h Protocol
3.
Inside NameNode • FSNameSystem
: INode,Metadata • BlockManager:Block,DataNode,Heartbeat • 两者关系不是割裂,紧密联系
4.
Inside NameNode • DataNode在NameNode中对应的对象 •
DataNode ——> DataNodeDescriptor • Disk ——> DataNodeStorageInfo • Block在DataNodeStorageInfo中以List存储,头结 点为blockList
5.
INode • Dir —>
INodeDirectory只有meta,没有实际存储 • File —> INodeFile Blocks Replica
6.
INodeFile • INodeFile存储BlockInfo • BlockInfo存储triplet
: save memory, block report
7.
Heartbeat • the function
of heartbeat
8.
BlockReport • The function
of BlockReport
9.
BlockReport • toInvalidate:不在BlockMap中,该Block已经被删 除 • toUC:在BlockMap中,状态为UC •
toCorrupt:在BlockMap中,状态为Corruput • toAdd:在BlockMap中,triplet没有该节点的该磁 盘 • toRemove:没有汇报,丢失的Block
10.
BlockReport流程
11.
BlockReport
12.
BlockReport
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