NameNode
E830287
NameNode is the central master server in Hadoop’s HDFS that manages the filesystem namespace and controls client access to files.
Statements (47)
| Predicate | Object |
|---|---|
| instanceOf |
HDFS component
ⓘ
master server ⓘ metadata server ⓘ |
| belongsTo | HDFS master-slave architecture ⓘ |
| canBe |
active NameNode
ⓘ
standby NameNode ⓘ |
| canStoreMetadataOn |
NFS shared storage
ⓘ
Quorum Journal Manager NERFINISHED ⓘ local filesystem ⓘ |
| communicatesWith | DataNode NERFINISHED ⓘ |
| controls | client access to files ⓘ |
| coordinates |
block replication
ⓘ
file creation ⓘ file deletion ⓘ file renaming ⓘ |
| detects | DataNode failures ⓘ |
| enforces |
HDFS replication factor
ⓘ
file system permissions ⓘ |
| exposes |
RPC interface to clients
ⓘ
web UI ⓘ |
| introducedIn | Hadoop 0.x series NERFINISHED ⓘ |
| is | single point of control in HDFS ⓘ |
| isImplementedIn | Java NERFINISHED ⓘ |
| maintains | in-memory representation of namespace ⓘ |
| manages | HDFS filesystem namespace ⓘ |
| monitors | DataNode heartbeats ⓘ |
| partOf |
Apache Hadoop
NERFINISHED
ⓘ
Hadoop Distributed File System NERFINISHED ⓘ |
| persistsChangesIn | edit log ⓘ |
| persistsMetadataIn | fsimage ⓘ |
| requires | large heap memory ⓘ |
| runsOn | dedicated server ⓘ |
| schedules |
block deletion
ⓘ
block replication balancing ⓘ |
| stores |
HDFS metadata
ⓘ
block locations ⓘ directory hierarchy ⓘ file permissions ⓘ file-to-block mappings ⓘ |
| supports |
federation of multiple NameNodes
ⓘ
high availability configuration ⓘ |
| triggers | block re-replication on failure ⓘ |
| uses |
checkpointing via CheckpointNode
ⓘ
checkpointing via Secondary NameNode (legacy) ⓘ edit log ⓘ fsimage ⓘ |
| wasOriginally | single point of failure ⓘ |
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.