Package org.apache.lucene.index
Interface TwoPhaseCommit
- All Known Implementing Classes:
IndexWriter
public interface TwoPhaseCommit
An interface for implementations that support 2-phase commit. You can use
TwoPhaseCommitTool to execute a 2-phase commit algorithm over several TwoPhaseCommits.- WARNING: This API is experimental and might change in incompatible ways in the next release.
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Method Details
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prepareCommit
The first stage of a 2-phase commit. Implementations should do as much work as possible in this method, but avoid actual committing changes. If the 2-phase commit fails,rollback()is called to discard all changes since last successful commit.- Throws:
IOException
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commit
The second phase of a 2-phase commit. Implementations should ideally do very little work in this method (followingprepareCommit(), and after it returns, the caller can assume that the changes were successfully committed to the underlying storage.- Throws:
IOException
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rollback
Discards any changes that have occurred since the last commit. In a 2-phase commit algorithm, where one of the objects failed tocommit()orprepareCommit(), this method is used to roll all other objects back to their previous state.- Throws:
IOException
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