/**
* Create a new {@link Reference} as copy of the source one.
*
* <p>
*
* <blockquote>
*
* <pre>
* The source table looks like:
* 1234/abc (original file)
* 5678/abc.1234 (reference file)
*
* After the clone operation looks like:
* wxyz/table=1234-abc
* stuv/table=1234-abc.wxyz
*
* NOTE that the region name in the clone changes (md5 of regioninfo)
* and the reference should reflect that change.
* </pre>
*
* </blockquote>
*
* @param familyDir destination directory for the store file
* @param regionInfo destination region info for the table
* @param hfileName reference file name
*/
private void restoreReferenceFile(
final Path familyDir, final HRegionInfo regionInfo, final String hfileName)
throws IOException {
// Extract the referred information (hfile name and parent region)
String tableName = snapshotDesc.getTable();
Path refPath =
StoreFile.getReferredToFile(
new Path(
new Path(new Path(tableName, regionInfo.getEncodedName()), familyDir.getName()),
hfileName));
String snapshotRegionName = refPath.getParent().getParent().getName();
String fileName = refPath.getName();
// The new reference should have the cloned region name as parent, if it is a clone.
String clonedRegionName = Bytes.toString(regionsMap.get(Bytes.toBytes(snapshotRegionName)));
if (clonedRegionName == null) clonedRegionName = snapshotRegionName;
// The output file should be a reference link table=snapshotRegion-fileName.clonedRegionName
String refLink = fileName;
if (!HFileLink.isHFileLink(fileName)) {
refLink = HFileLink.createHFileLinkName(tableName, snapshotRegionName, fileName);
}
Path outPath = new Path(familyDir, refLink + '.' + clonedRegionName);
// Create the new reference
Path linkPath =
new Path(
familyDir,
HFileLink.createHFileLinkName(tableName, regionInfo.getEncodedName(), hfileName));
InputStream in = new HFileLink(conf, linkPath).open(fs);
OutputStream out = fs.create(outPath);
IOUtils.copyBytes(in, out, conf);
}
/**
* Create a new {@link HFileLink} to reference the store file.
*
* <p>The store file in the snapshot can be a simple hfile, an HFileLink or a reference.
*
* <ul>
* <li>hfile: abc -> table=region-abc
* <li>reference: abc.1234 -> table=region-abc.1234
* <li>hfilelink: table=region-hfile -> table=region-hfile
* </ul>
*
* @param familyDir destination directory for the store file
* @param regionInfo destination region info for the table
* @param hfileName store file name (can be a Reference, HFileLink or simple HFile)
*/
private void restoreStoreFile(
final Path familyDir, final HRegionInfo regionInfo, final String hfileName)
throws IOException {
if (HFileLink.isHFileLink(hfileName)) {
HFileLink.createFromHFileLink(conf, fs, familyDir, hfileName);
} else if (StoreFile.isReference(hfileName)) {
restoreReferenceFile(familyDir, regionInfo, hfileName);
} else {
HFileLink.create(conf, fs, familyDir, regionInfo, hfileName);
}
}