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From "maoling (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (ZOOKEEPER-3352) Use LevelDB For Backend
Date Thu, 11 Apr 2019 02:49:00 GMT

    [ https://issues.apache.org/jira/browse/ZOOKEEPER-3352?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16815030#comment-16815030
] 

maoling commented on ZOOKEEPER-3352:
------------------------------------

[~belugabehr]
Plz take another look at the my referece provided above.
- 1.There was a good evalutions from Xiang Li, Why the etcd-v3 choose the boltDB:
     https://github.com/etcd-io/etcd/issues/2646
- 2.Look at this:
     https://github.com/boltdb/bolt#comparison-with-other-databases
 
 *LevelDB and its derivatives (RocksDB, HyperLevelDB) are similar to Bolt in that they are
libraries bundled into the application, however, their underlying structure is a log-structured
merge-tree (LSM tree). An LSM tree optimizes random writes by using a write ahead log and
multi-tiered, sorted files called SSTables. Bolt uses a B+tree internally and only a single
file. Both approaches have trade-offs.*
 *If you require a high random write throughput (>10,000 w/sec) or you need to use spinning
disks then LevelDB could be a good choice. If your application is read-heavy or does a lot
of range scans then Bolt could be a good choice.*
 *One other important consideration is that LevelDB does not have transactions. It supports
batch writing of key/values pairs and it supports read snapshots but it will not give you
the ability to do a compare-and-swap operation safely. Bolt supports fully serializable ACID
transactions.*

> Use LevelDB For Backend
> -----------------------
>
>                 Key: ZOOKEEPER-3352
>                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-3352
>             Project: ZooKeeper
>          Issue Type: New Feature
>          Components: server
>            Reporter: David Mollitor
>            Assignee: David Mollitor
>            Priority: Critical
>             Fix For: 4.0.0
>
>
> Use LevelDB for managing data stored in ZK (transaction logs and snapshots).
> https://stackoverflow.com/questions/6779669/does-leveldb-support-java



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