public class MultiPassIndexSplitter extends Object
IndexWriter.addIndexes(CodecReader)where the input data comes from the input index with artificially applied deletes to the document id-s that fall outside the selected partition.
Note 1: Deletes are only applied to a buffered list of deleted docs and don't affect the source index - this tool works also with read-only indexes.
Note 2: the disadvantage of this tool is that source index needs to be read as many times as there are parts to be created, hence the name of this tool.
NOTE: this tool is unaware of documents added
IndexWriter.addDocuments(java.lang.Iterable<? extends java.lang.Iterable<? extends org.apache.lucene.index.IndexableField>>) or
IndexWriter.updateDocuments(org.apache.lucene.index.Term, java.lang.Iterable<? extends java.lang.Iterable<? extends org.apache.lucene.index.IndexableField>>), which means it can easily
break up such document groups.
|Constructor and Description|
|Modifier and Type||Method and Description|
Split source index into multiple parts.
public void split(IndexReader in, Directory outputs, boolean seq) throws IOException
in- source index, can have deletions, can have multiple segments (or multiple readers).
outputs- list of directories where the output parts will be stored.
seq- if true, then the source index will be split into equal increasing ranges of document id-s. If false, source document id-s will be assigned in a deterministic round-robin fashion to one of the output splits.
IOException- If there is a low-level I/O error
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