在不使索引脱机(热备份)的情况下备份 lucene 索引的最佳做法是什么?
What is the best practice to backup a lucene index without taking the index offline (hot backup)?
您不必为了备份索引而停止 IndexWriter.
You don't have to stop your IndexWriter in order to take a backup of the index.
只需使用 SnapshotDeletionPolicy，它可以让您保护"给定的提交点(及其包含的所有文件)不被删除.然后，将该提交点中的文件复制到您的备份，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 就不会删除文件(例如，即使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).
这为您提供了一致的备份，它是索引的时间点映像，不会阻塞正在进行的索引.
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)中对此进行了介绍，并且有从 http://提供(免费)的书中摘录的论文www.manning.com/hatcher3，使用 Lucene 进行热备份"，对此进行了更详细的描述.
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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