org.apache.lucene.index

Class PooledConcurrentMergeScheduler

java.lang.Object

org.apache.lucene.index.MergeScheduler

org.apache.lucene.index.ConcurrentMergeScheduler

org.apache.lucene.index.PooledConcurrentMergeScheduler

All Implemented Interfaces:

Closeable, AutoCloseable

public class PooledConcurrentMergeScheduler
extends org.apache.lucene.index.ConcurrentMergeScheduler

Lucene indexes merge scheduler that execute merges in a thread pool instead of starting separate thread for each merge. Each writer have it's own scheduler but all of them use shared pool. Current implementation is minimalistic in a number of things it knows about lucene internals to simplify migrations overhead. It wraps up lucene internal merge tasks and execute them in a common thread pool. In case if pool and queue exhausted merge will be performed in callers thread. Since we cant rely on lucene per writer merge threads we need to perform writer tasks counting ourselves to prevent cases while writer will be closed in the middle of merge and will wait for all writer related merges to complete before allowing close of writer scheduler.

Field Summary

Fields inherited from class org.apache.lucene.index.ConcurrentMergeScheduler

AUTO_DETECT_MERGES_AND_THREADS, DEFAULT_CPU_CORE_COUNT_PROPERTY, DEFAULT_SPINS_PROPERTY

Constructor Summary

Constructors

Constructor and Description
PooledConcurrentMergeScheduler()

Method Summary

Modifier and Type	Method and Description
void	close()
void	merge(org.apache.lucene.index.IndexWriter writer, org.apache.lucene.index.MergeTrigger trigger, boolean newMergesFound)

Methods inherited from class org.apache.lucene.index.ConcurrentMergeScheduler

disableAutoIOThrottle, enableAutoIOThrottle, getAutoIOThrottle, getForceMergeMBPerSec, getIORateLimitMBPerSec, getMaxMergeCount, getMaxThreadCount, mergeThreadCount, setDefaultMaxMergesAndThreads, setForceMergeMBPerSec, setMaxMergesAndThreads, sync, toString

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

PooledConcurrentMergeScheduler

public PooledConcurrentMergeScheduler()

Method Detail

merge

public void merge(org.apache.lucene.index.IndexWriter writer,
                  org.apache.lucene.index.MergeTrigger trigger,
                  boolean newMergesFound)
           throws IOException

Overrides:

merge in class org.apache.lucene.index.ConcurrentMergeScheduler

Throws:

IOException

close

public void close()

Specified by:

close in interface Closeable

Specified by:

close in interface AutoCloseable

Overrides:

close in class org.apache.lucene.index.ConcurrentMergeScheduler