org.apache.lucene.index

## Class MergeRateLimiter

- java.lang.Object
- - org.apache.lucene.store.RateLimiter
  - - org.apache.lucene.index.MergeRateLimiter

-     public class MergeRateLimiter
      extends RateLimiter

  This is the `RateLimiter` that `IndexWriter` assigns to each running merge, to give `MergeScheduler`s ionice like control.
  NOTE: This API is for internal purposes only and might change in incompatible ways in the next release.

- - ### Nested Class Summary

    - ### Nested classes/interfaces inherited from class org.apache.lucene.store.RateLimiter

      `RateLimiter.SimpleRateLimiter`

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `MergeRateLimiter(MergePolicy.OneMergeProgress mergeProgress)` Sole constructor.

  - ### Method Summary

    All Methods Instance Methods Concrete Methods
    Modifier and Type | Method and Description
    --- | ---
    `double` | `getMBPerSec()` The current MB per second rate limit.
    `long` | `getMinPauseCheckBytes()` How many bytes caller should add up itself before invoking `RateLimiter.pause(long)`.
    `long` | `getTotalBytesWritten()` Returns total bytes written by this merge.
    `long` | `getTotalPausedNS()` Total NS merge was paused to rate limit IO.
    `long` | `getTotalStoppedNS()` Total NS merge was stopped.
    `long` | `pause(long bytes)` Pauses, if necessary, to keep the instantaneous IO rate at or below the target.
    `void` | `setMBPerSec(double mbPerSec)` Sets an updated MB per second rate limit.

    - ### Methods inherited from class java.lang.Object

      `clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

- - ### Constructor Detail

    - #### MergeRateLimiter

          public MergeRateLimiter(MergePolicy.OneMergeProgress mergeProgress)

      Sole constructor.

  - ### Method Detail

    - #### setMBPerSec

          public void setMBPerSec(double mbPerSec)

      Description copied from class: `RateLimiter`
      Sets an updated MB per second rate limit.
      Specified by:
        `setMBPerSec` in class `RateLimiter`

    - #### getMBPerSec

          public double getMBPerSec()

      Description copied from class: `RateLimiter`
      The current MB per second rate limit.
      Specified by:
        `getMBPerSec` in class `RateLimiter`

    - #### getTotalBytesWritten

          public long getTotalBytesWritten()

      Returns total bytes written by this merge.

    - #### pause

          public long pause(long bytes)
                     throws MergePolicy.MergeAbortedException

      Description copied from class: `RateLimiter`
      Pauses, if necessary, to keep the instantaneous IO rate at or below the target.

      Note: the implementation is thread-safe

      Specified by:
        `pause` in class `RateLimiter`
      Returns:
        the pause time in nano seconds
      Throws:
        `MergePolicy.MergeAbortedException`

    - #### getTotalStoppedNS

          public long getTotalStoppedNS()

      Total NS merge was stopped.

    - #### getTotalPausedNS

          public long getTotalPausedNS()

      Total NS merge was paused to rate limit IO.

    - #### getMinPauseCheckBytes

          public long getMinPauseCheckBytes()

      Description copied from class: `RateLimiter`
      How many bytes caller should add up itself before invoking `RateLimiter.pause(long)`.
      Specified by:
        `getMinPauseCheckBytes` in class `RateLimiter`

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