| /hbase |
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永久 |
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| /hbase/hbaseid |
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永久 |
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| /hbase/meta-region-server |
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永久 |
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| /hbase/hbaseid |
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临时 |
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| /hbase/rs |
Region Server |
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永久 |
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| /hbase/unassigned |
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| /hbase/master |
HMaster |
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临时 |
The “active” master will register its own address in this znode at startup, making this znode the source of truth for identifying which server is the Master. |
| /hbase/backup-masters |
inactive Master |
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临时 |
Each inactive Master will register itself as backup Master by creating a sub-znode (hbase/backup-master/m1.host). This znode is mainly used to track which machines are available to replace the Master in case of failure. |
| /hbase/table |
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永久 |
Used by the master to track the table state during assignments (disabling/enabling states, for example). |
| /hbase/table-lock |
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永久 |
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| /hbase/splitlog |
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永久 |
Used by the log splitter to track the pending log to replay and its assignment. |
| /hbase/acl |
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永久 |
The acl znode is used for synchronizing the changes made to the acl table by the grant/revoke commands. Each table will have a sub-znode (/hbase/acl/tableName) containing the ACLs of the table. |
| /hbase/tokenauth |
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永久 |
The token provider is usually used to allow a MapReduce job to access the HBase cluster. When a user asks for a new token the information will be stored in a sub-znode created for the key (/hbase/tokenauth/keys/key-id). |
| /hbase/replication |
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永久 |
Root znode that contains all HBase replication state information |
| /hbase/replication/peers |
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永久 |
Each peer will have a sub-znode (e.g. /hbase/replication/peers/<ClusterID>) containing the ZK ensemble’s addresses that allows the peer to be contacted. |
| /hbase/replication/state |
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永久 |
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| /hbase/replication/rs |
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永久 |
Contains the list of RegionServers in the main cluster (/hbase/replication/rs/<region server>). And for each RegionServer znode there is one sub-znode per peer to which it is replicating. Inside the peer sub-znode the hlogs are waiting to be replicated (/hbase/replication/rs/<region server>/<ClusterId>/<hlogName>). |