Lucene索引备份 [英] Lucene index backup

问题描述

在不使索引离线的情况下备份Lucene索引的最佳实践是什么(热备份)?

What is the best practice to backup a lucene index without taking the index offline (hot backup)?

推荐答案

您不必停止IndexWriter即可备份索引.

You don't have to stop your IndexWriter in order to take a backup of the index.

只需使用SnapshotDeletionPolicy，它就可以保护"给定的提交点(及其包含的所有文件)，使其不被删除.然后，将该提交点中的文件复制到您的备份中，最后释放提交.

Just use the SnapshotDeletionPolicy, which lets you "protect" a given commit point (and all files it includes) from being deleted. Then, copy the files in that commit point to your backup, and finally release the commit.

如果备份需要一段时间才能运行，这很好-只要您不使用SnapshotDeletionPolicy释放提交点，IndexWriter都不会删除文件(即使例如，它们已经合并在一起).

It's fine if the backup takes a while to run -- as long as you don't release the commit point with SnapshotDeletionPolicy, the IndexWriter will not delete the files (even if, eg, they have since been merged together).

这将为您提供一致的备份，这是索引的时间点映像，而不会阻止正在进行的索引编制.

This gives you a consistent backup which is a point-in-time image of the index without blocking ongoing indexing.

我在《 Lucene in Action》(第2版)中写过关于此的内容，该书的摘录(免费)摘自 http://www.manning.com/hatcher3 ，使用Lucene进行热备份"，对此进行了详细说明.

I wrote about this in Lucene in Action (2nd edition), and there's paper excerpted from the book available (free) from http://www.manning.com/hatcher3, "Hot Backups with Lucene", that describes this in more detail.

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