PrefetchExecutor (Apache HBase 2.4.0 API)

@InterfaceAudience.Private
public final class PrefetchExecutor
extends Object

Fields
Modifier and Type	Field and Description
`private static org.slf4j.Logger`	`LOG`
`private static int`	`prefetchDelayMillis` Delay before beginning prefetch
`private static float`	`prefetchDelayVariation` Variation in prefetch delay times, to mitigate stampedes
`private static ScheduledExecutorService`	`prefetchExecutorPool` Executor pool shared among all HFiles for block prefetch
`private static Map<org.apache.hadoop.fs.Path,Future<?>>`	`prefetchFutures` Futures for tracking block prefetch activity
`private static Pattern`	`prefetchPathExclude`
`private static Random`	`RNG`

Constructors
Modifier	Constructor and Description
`private`	`PrefetchExecutor()`

All Methods Static Methods Concrete Methods
Modifier and Type	Method and Description
`static void`	`cancel(org.apache.hadoop.fs.Path path)`
`static void`	`complete(org.apache.hadoop.fs.Path path)`
`static boolean`	`isCompleted(org.apache.hadoop.fs.Path path)`
`static void`	`request(org.apache.hadoop.fs.Path path, Runnable runnable)`

private static final org.slf4j.Logger LOG

private static final Map<org.apache.hadoop.fs.Path,Future<?>> prefetchFutures

Futures for tracking block prefetch activity

prefetchExecutorPool
```
private static final ScheduledExecutorService prefetchExecutorPool
```
Executor pool shared among all HFiles for block prefetch

prefetchDelayMillis
```
private static final int prefetchDelayMillis
```
Delay before beginning prefetch

prefetchDelayVariation
```
private static final float prefetchDelayVariation
```
Variation in prefetch delay times, to mitigate stampedes

private static final Pattern prefetchPathExclude

public static void request(org.apache.hadoop.fs.Path path,
                           Runnable runnable)

public static void complete(org.apache.hadoop.fs.Path path)

public static void cancel(org.apache.hadoop.fs.Path path)

public static boolean isCompleted(org.apache.hadoop.fs.Path path)

Class PrefetchExecutor