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## org.apache.lucene.index
Class MergeScheduler

    java.lang.Object
      org.apache.lucene.index.MergeScheduler

All Implemented Interfaces:
  Closeable, Cloneable

Direct Known Subclasses:
  ConcurrentMergeScheduler, NoMergeScheduler, SerialMergeScheduler

    public abstract class MergeScheduler

extends Object
implements Closeable, Cloneable

Expert: `IndexWriter` uses an instance implementing this interface to execute the merges selected by a `MergePolicy`. The default MergeScheduler is `ConcurrentMergeScheduler`.

WARNING: This API is experimental and might change in incompatible ways in the next release.

Constructor Summary
`protected` | `MergeScheduler()` Sole constructor.

Method Summary
`MergeScheduler` | `clone()`
`abstract void` | `close()` Close this MergeScheduler.
`abstract void` | `merge(IndexWriter writer)` Run the merges provided by `IndexWriter.getNextMerge()`.

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

Constructor Detail

### MergeScheduler

    protected MergeScheduler()

  Sole constructor. (For invocation by subclass constructors, typically implicit.)

Method Detail

### merge

    public abstract void merge(IndexWriter writer)
                        throws IOException

  Run the merges provided by `IndexWriter.getNextMerge()`.

  Throws:
    `IOException`

### close

    public abstract void close()
                        throws IOException

  Close this MergeScheduler.

  Specified by:
    `close` in interface `Closeable`
  Throws:
    `IOException`

### clone

    public MergeScheduler clone()

  Overrides:
    `clone` in class `Object`

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