ExponentialClientBackoffPolicy (Apache HBase 1.2.12 API)

java.lang.Object
- org.apache.hadoop.hbase.client.backoff.ExponentialClientBackoffPolicy

All Implemented Interfaces:

ClientBackoffPolicy
```
@InterfaceAudience.Public
@InterfaceStability.Unstable
public class ExponentialClientBackoffPolicy
extends Object
implements ClientBackoffPolicy
```
Simple exponential backoff policy on for the client that uses a percent^4 times the max backoff to generate the backoff time.

Field Summary

Fields
Modifier and Type	Field and Description
`static long`	`DEFAULT_MAX_BACKOFF`
`private float`	`heapOccupancyHighWatermark`
`private float`	`heapOccupancyLowWatermark`
`private static org.apache.commons.logging.Log`	`LOG`
`static String`	`MAX_BACKOFF_KEY`
`private long`	`maxBackoff`
`private static long`	`ONE_MINUTE`

Fields inherited from interface org.apache.hadoop.hbase.client.backoff.ClientBackoffPolicy
BACKOFF_POLICY_CLASS

Constructor Summary

Constructors
Constructor and Description

ExponentialClientBackoffPolicy(org.apache.hadoop.conf.Configuration conf)

Constructors
Constructor and Description
`ExponentialClientBackoffPolicy(org.apache.hadoop.conf.Configuration conf)`

Method Summary

Methods
Modifier and Type	Method and Description
`long`	`getBackoffTime(ServerName serverName, byte[] region, ServerStatistics stats)`
`private static double`	`scale(double valueIn, double baseMin, double baseMax, double limitMin, double limitMax)` Scale valueIn in the range [baseMin,baseMax] to the range [limitMin,limitMax]

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

LOG

private static final org.apache.commons.logging.Log LOG

ONE_MINUTE
```
private static final long ONE_MINUTE
```
See Also:
Constant Field Values

DEFAULT_MAX_BACKOFF
```
public static final long DEFAULT_MAX_BACKOFF
```
See Also:
Constant Field Values

MAX_BACKOFF_KEY

public static final String MAX_BACKOFF_KEY

See Also:: Constant Field Values

maxBackoff
```
private long maxBackoff
```

heapOccupancyLowWatermark

private float heapOccupancyLowWatermark

heapOccupancyHighWatermark

private float heapOccupancyHighWatermark

Constructor Detail

ExponentialClientBackoffPolicy

public ExponentialClientBackoffPolicy(org.apache.hadoop.conf.Configuration conf)

Method Detail

getBackoffTime

public long getBackoffTime(ServerName serverName,
                  byte[] region,
                  ServerStatistics stats)

Specified by:: getBackoffTime in interface ClientBackoffPolicy
Returns:: the number of ms to wait on the client based on the

scale

private static double scale(double valueIn,
           double baseMin,
           double baseMax,
           double limitMin,
           double limitMax)

Scale valueIn in the range [baseMin,baseMax] to the range [limitMin,limitMax]

Class ExponentialClientBackoffPolicy

Field Summary

Fields inherited from interface org.apache.hadoop.hbase.client.backoff.ClientBackoffPolicy

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

LOG

ONE_MINUTE

DEFAULT_MAX_BACKOFF

MAX_BACKOFF_KEY

maxBackoff

heapOccupancyLowWatermark

heapOccupancyHighWatermark

Constructor Detail

ExponentialClientBackoffPolicy

Method Detail

getBackoffTime

scale