Cao Manh Dat created SOLR-13608:
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Summary: Incremental backup for Solr
Key: SOLR-13608
URL: https://issues.apache.org/jira/browse/SOLR-13608
Project: Solr
Issue Type: Improvement
Security Level: Public (Default Security Level. Issues are Public)
Reporter: Cao Manh Dat
Assignee: Cao Manh Dat
Currently every call to backup API requires backup the whole index with
different backupName. This is very costly and nearly useless in case of large
frequent change indexes.
Since index files of Lucene are written one only, they also contains the
informantion about checksum of files. Then we can rely on these to support
incremental backup -- only upload files that do not present in the repository.
The design for this issue will be like this
* Adding another parameter named {{incremental}} to backup API.
* Adding new methods to {{BackupRepository}}, unfortunately we still uses Java
8 for branch_8_x therefore we can't use {{default method}}. Therefore if
someone already have a customised version of BackupRepository, they need to
recompile their code. (Simply by throw {{UnsupportedOperationException}} on
methods).
* {{SnapShooter}} will skip uploading files from local if file in repository
matches in checksum and length.
* Segments_N will be copied last to guarantee that even the backup process get
interrupted in the middle, the old backup will still can be used.
* We only keep the last {{IndexCommit}} therefore after uploading Segments_N
successfully, any file does not needed for the last {{IndexCommit}} will be
deleted. We will try to improve this situation in another issue.
* Any files in ZK will be re-uploaded
** The ZK files coressponds first backup will be stored in same location as
today (to maintain backward compatibility)
** On subsequent backups ZK files will be stored in folder {{gen-ith}}
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