Secondary NameNode
E829911
The Secondary NameNode is an auxiliary HDFS service that periodically checkpoints and merges filesystem metadata to help keep the primary NameNode’s namespace image compact and manageable.
Statements (38)
| Predicate | Object |
|---|---|
| instanceOf |
HDFS component
ⓘ
auxiliary HDFS service ⓘ |
| canRunOn | separate physical machine from NameNode ⓘ |
| category | HDFS metadata management ⓘ |
| communicatesWith | primary NameNode ⓘ |
| configuredBy | hdfs-site.xml ⓘ |
| developedBy | Apache Software Foundation NERFINISHED ⓘ |
| hasRole |
checkpointing service
ⓘ
metadata helper for NameNode ⓘ |
| helpsWith |
keeping NameNode namespace image compact
ⓘ
limiting size of NameNode edit logs ⓘ |
| identifiedBy | secondarynamenode daemon ⓘ |
| improves | manageability of NameNode namespace ⓘ |
| introducedIn | early Hadoop 1.x architecture ⓘ |
| license | Apache License 2.0 ⓘ |
| manages | HDFS filesystem metadata ⓘ |
| notInstanceOf |
backup NameNode
ⓘ
high-availability NameNode ⓘ |
| oftenMisunderstoodAs | hot standby NameNode ⓘ |
| partOf |
Apache Hadoop
NERFINISHED
ⓘ
Hadoop Distributed File System NERFINISHED ⓘ |
| performs |
merging of fsimage and edits logs
ⓘ
periodic checkpoints of filesystem metadata ⓘ |
| produces | new checkpointed fsimage ⓘ |
| readsFrom |
NameNode edits log
ⓘ
NameNode fsimage NERFINISHED ⓘ |
| reduces |
NameNode restart time
ⓘ
overhead of large edit logs ⓘ |
| relatedTo | BackupNode NERFINISHED ⓘ |
| replacedBy | CheckpointNode NERFINISHED ⓘ |
| requires | access to NameNode metadata files ⓘ |
| runsOn | separate daemon process ⓘ |
| softwareLanguage | Java NERFINISHED ⓘ |
| supportsComponent | NameNode NERFINISHED ⓘ |
| usedIn | non-HA Hadoop deployments ⓘ |
| uses |
edits log
ⓘ
fsimage ⓘ |
| writesTo | checkpoint directory ⓘ |
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.