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lucene flush commit与elasticsearch的refresh flush     所属分类 lucene 浏览量 41
参考源码
elasticsearch5.6.12 lucene6.6.1 

lucene
flush  将内存中的segment写到磁盘但不执行fileChannel.force一部分数据会在buffer中
commit 调用force,将buffer中的数据写到磁盘


elasticsearch
refresh 调用lucene的flush
flush   调用lucene的commit



lucene flush DocumentsWriter.doFlush DocumentsWriterPerThread.flush DefaultIndexingChain.flush // nvd nvm文件 writeNorms writeDocValues // dii dim文件 writePoints // fdt, fdx文件 storedFieldsConsumer.flush // doc, pos, tim, tip文件 termsHash.flush // fnm文件 docWriter.codec.fieldInfosFormat().write // cfs, cfe, si, liv 文件 DocumentsWriterPerThread.sealFlushedSegment // 删除cfs, cfe, si, liv 之外的文件 IndexWriter.doAfterFlush flush 相关配置 maxBufferedDocs ramBufferSizeMB perThreadHardLimitMB
Lucene commit commit执行fileChannel.force,将buffer中的数据写到磁盘 flush all segments 执行合并 maybeMerge,满足merge条件则合并 IndexWriter.commit IndexWriter.commitInternal IndexWriter.prepareCommitInternal // flush segments DocumentsWriter.flushAllThreads // sync IndexWriter.startCommit Directory.sync IOUtils.fsync FileChannel.force FileChannelImpl.force // 更新commit信息segments_n,删除旧的segments_n-1 IndexWriter.finishCommit // 满足merge条件则merge IndexWriter.maybeMerge
Lucene maybeMerge merge 异步执行 合并小段 ,大段不合并 IndexWriter.maybeMerge IndexWriter.updatePendingMerges // 查找可merge的segments TieredMergePolicy.findMerges // 执行merge ConcurrentMergeScheduler.merge // 异步执行merge MergeThread
es refresh refresh_interval indices.memory.index_buffer_size InternalEngine.refresh // lucene refresh ReferenceManager.maybeRefreshBlocking DirectoryReader.openIfChanged StandardDirectoryReader.doOpenIfChanged IndexWriter.getReader // flush segments DocumentsWriter.flushAllThreads IndexWriter.maybeMerge
es flush translog.ckp translog-n.tlog InternalEngine.flush // prepareCommit translog Translog.prepareCommit // es commit index writer InternalEngine.commitIndexWriter // lucene commit IndexWriter.commit InternalEngine.refresh Translog.commit
elasticsearch中refresh和flush区别

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