Struct zookeeper::Stat[−][src]

pub struct Stat {
    pub czxid: i64,
    pub mzxid: i64,
    pub ctime: i64,
    pub mtime: i64,
    pub version: i32,
    pub cversion: i32,
    pub aversion: i32,
    pub ephemeral_owner: i64,
    pub data_length: i32,
    pub num_children: i32,
    pub pzxid: i64,
}

Statistics about a znode, similar to the UNIX stat structure.

Time in ZooKeeper

The concept of time is tricky in distributed systems. ZooKeeper keeps track of time in a number of ways.

  • zxid: Every change to a ZooKeeper cluster receives a stamp in the form of a zxid (ZooKeeper Transaction ID). This exposes the total ordering of all changes to ZooKeeper. Each change will have a unique zxid -- if zxid:a is smaller than zxid:b, then the associated change to zxid:a happened before zxid:b.
  • Version Numbers: Every change to a znode will cause an increase to one of the version numbers of that node.
  • Clock Time: ZooKeeper does not use clock time to make decisions, but it uses it to put timestamps into the Stat structure.

Fields

czxid: i64

The transaction ID that created the znode.

mzxid: i64

The last transaction that modified the znode.

ctime: i64

Milliseconds since epoch when the znode was created.

mtime: i64

Milliseconds since epoch when the znode was last modified.

version: i32

The number of changes to the data of the znode.

cversion: i32

The number of changes to the children of the znode.

aversion: i32

The number of changes to the ACL of the znode.

ephemeral_owner: i64

The session ID of the owner of this znode, if it is an ephemeral entry.

data_length: i32

The length of the data field of the znode.

num_children: i32

The number of children this znode has.

pzxid: i64

The transaction ID that last modified the children of the znode.

Implementations

impl Stat[src]

pub fn is_ephemeral(&self) -> bool[src]

Is the znode an ephemeral entry?

Trait Implementations

impl Debug for Stat[src]

Auto Trait Implementations

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