AsyncKuduScanner.ReadMode (Kudu 1.0.1 API)

java.lang.Object
- java.lang.Enum<AsyncKuduScanner.ReadMode>
- - org.apache.kudu.client.AsyncKuduScanner.ReadMode

All Implemented Interfaces:

Serializable, Comparable<AsyncKuduScanner.ReadMode>

Enclosing class:

AsyncKuduScanner
```
@InterfaceAudience.Public
@InterfaceStability.Evolving
public static enum AsyncKuduScanner.ReadMode
extends Enum<AsyncKuduScanner.ReadMode>
```
The possible read modes for scanners.

Enum Constant Summary

Enum Constants
Enum Constant and Description
`READ_AT_SNAPSHOT` When READ_AT_SNAPSHOT is specified the server will attempt to perform a read at the provided timestamp.
`READ_LATEST` When READ_LATEST is specified the server will always return committed writes at the time the request was received.

Method Summary

Methods
Modifier and Type	Method and Description
`static AsyncKuduScanner.ReadMode`	`valueOf(String name)` Returns the enum constant of this type with the specified name.
`static AsyncKuduScanner.ReadMode[]`	`values()` Returns an array containing the constants of this enum type, in the order they are declared.

Methods inherited from class java.lang.Enum
clone, compareTo, equals, finalize, getDeclaringClass, hashCode, name, ordinal, toString, valueOf

Methods inherited from class java.lang.Object
getClass, notify, notifyAll, wait, wait, wait

- Enum Constant Detail
  - READ_LATEST
```
public static final AsyncKuduScanner.ReadMode READ_LATEST
```
    When READ_LATEST is specified the server will always return committed writes at the time the request was received. This type of read does not return a snapshot timestamp and is not repeatable. In ACID terms this corresponds to Isolation mode: "Read Committed" This is the default mode.
  - READ_AT_SNAPSHOT
```
public static final AsyncKuduScanner.ReadMode READ_AT_SNAPSHOT
```
    When READ_AT_SNAPSHOT is specified the server will attempt to perform a read at the provided timestamp. If no timestamp is provided the server will take the current time as the snapshot timestamp. In this mode reads are repeatable, i.e. all future reads at the same timestamp will yield the same data. This is performed at the expense of waiting for in-flight transactions whose timestamp is lower than the snapshot's timestamp to complete, so it might incur a latency penalty. In ACID terms this, by itself, corresponds to Isolation mode "Repeatable Read". If all writes to the scanned tablet are made externally consistent, then this corresponds to Isolation mode "Strict-Serializable". Note: there currently "holes", which happen in rare edge conditions, by which writes are sometimes not externally consistent even when action was taken to make them so. In these cases Isolation may degenerate to mode "Read Committed". See KUDU-430.
- Method Detail
  - values
```
public static AsyncKuduScanner.ReadMode[] values()
```
    Returns an array containing the constants of this enum type, in the order they are declared. This method may be used to iterate over the constants as follows:
```
for (AsyncKuduScanner.ReadMode c : AsyncKuduScanner.ReadMode.values())
    System.out.println(c);
```
    Returns:
    an array containing the constants of this enum type, in the order they are declared
  - valueOf
```
public static AsyncKuduScanner.ReadMode valueOf(String name)
```
    Returns the enum constant of this type with the specified name. The string must match exactly an identifier used to declare an enum constant in this type. (Extraneous whitespace characters are not permitted.)
    
    Parameters:
    name - the name of the enum constant to be returned.
    
    Returns:
    the enum constant with the specified name
    
    Throws:
    
    IllegalArgumentException - if this enum type has no constant with the specified name
    
    NullPointerException - if the argument is null

Enum AsyncKuduScanner.ReadMode

Enum Constant Summary

Method Summary

Methods inherited from class java.lang.Enum

Methods inherited from class java.lang.Object

Enum Constant Detail

READ_LATEST

READ_AT_SNAPSHOT

Method Detail

values

valueOf