elasticsearch - [Elasticsearch]:无法恢复主碎片

Question

我正在使用Elasticsearch 2.3.5版本。我必须从备份磁盘恢复完整的数据。除了2个碎片，一切都恢复了。在检查日志时，发现以下错误。

错误:

Caused by: java.nio.file.NoSuchFileException: /data/<cluster_name>/nodes/0/indices/index_name/shard_no/index/_c4_49.liv
        at sun.nio.fs.UnixException.translateToIOException(UnixException.java:86)
        at sun.nio.fs.UnixException.rethrowAsIOException(UnixException.java:102)
        at sun.nio.fs.UnixException.rethrowAsIOException(UnixException.java:107)
        at sun.nio.fs.UnixFileSystemProvider.newFileChannel(UnixFileSystemProvider.java:177)
        at java.nio.channels.FileChannel.open(FileChannel.java:287)
        at java.nio.channels.FileChannel.open(FileChannel.java:335)
        at org.apache.lucene.store.NIOFSDirectory.openInput(NIOFSDirectory.java:81)
        at org.apache.lucene.store.FileSwitchDirectory.openInput(FileSwitchDirectory.java:186)
        at org.apache.lucene.store.FilterDirectory.openInput(FilterDirectory.java:89)
        at org.apache.lucene.store.FilterDirectory.openInput(FilterDirectory.java:89)
        at org.apache.lucene.store.Directory.openChecksumInput(Directory.java:109)
        at org.apache.lucene.codecs.lucene50.Lucene50LiveDocsFormat.readLiveDocs(Lucene50LiveDocsFormat.java:83)
        at org.apache.lucene.index.SegmentReader.<init>(SegmentReader.java:73)
        at org.apache.lucene.index.ReadersAndUpdates.getReader(ReadersAndUpdates.java:145)
        at org.apache.lucene.index.ReadersAndUpdates.getReadOnlyClone(ReadersAndUpdates.java:197)
        at org.apache.lucene.index.StandardDirectoryReader.open(StandardDirectoryReader.java:99)
        at org.apache.lucene.index.IndexWriter.getReader(IndexWriter.java:435)
        at org.apache.lucene.index.DirectoryReader.open(DirectoryReader.java:100)
        at org.elasticsearch.index.engine.InternalEngine.createSearcherManager(InternalEngine.java:283)
        ... 12 more

谁能说出为什么会这样，或者我可以跳过这个特定文件吗？

提前致谢

Answer 1

不幸的是，从文件系统备份中还原Elasticsearch并不是恢复数据的可靠方法，并且有时会失败。您应该始终使用snapshot and restore代替。您的版本比较旧，但更新了版本include this warning in the docs(也适用于您的版本):

WARNING: You cannot back up an Elasticsearch cluster by simply copying the data directories of all of its nodes. Elasticsearch may be making changes to the contents of its data directories while it is running; copying its data directories cannot be expected to capture a consistent picture of their contents. If you try to restore a cluster from such a backup, it may fail and report corruption and/or missing files. Alternatively, it may appear to have succeeded though it silently lost some of its data. The only reliable way to back up a cluster is by using the snapshot and restore functionality.

还原也可能会静默地丢失了其他分片中的数据，这是无话可说的。假设您还没有丢失的分片中保存的数据的快照，唯一的恢复方法是从其源重新索引。