/**
* Clone specified regions. For each region create a new region and create a HFileLink for each
* hfile.
*/
private HRegionInfo[] cloneHdfsRegions(final List<HRegionInfo> regions) throws IOException {
if (regions == null || regions.size() == 0) return null;
final Map<String, HRegionInfo> snapshotRegions =
new HashMap<String, HRegionInfo>(regions.size());
// clone region info (change embedded tableName with the new one)
HRegionInfo[] clonedRegionsInfo = new HRegionInfo[regions.size()];
for (int i = 0; i < clonedRegionsInfo.length; ++i) {
// clone the region info from the snapshot region info
HRegionInfo snapshotRegionInfo = regions.get(i);
clonedRegionsInfo[i] = cloneRegionInfo(snapshotRegionInfo);
// add the region name mapping between snapshot and cloned
String snapshotRegionName = snapshotRegionInfo.getEncodedName();
String clonedRegionName = clonedRegionsInfo[i].getEncodedName();
regionsMap.put(Bytes.toBytes(snapshotRegionName), Bytes.toBytes(clonedRegionName));
LOG.info("clone region=" + snapshotRegionName + " as " + clonedRegionName);
// Add mapping between cloned region name and snapshot region info
snapshotRegions.put(clonedRegionName, snapshotRegionInfo);
}
// create the regions on disk
ModifyRegionUtils.createRegions(
conf,
tableDir.getParent(),
tableDesc,
clonedRegionsInfo,
new ModifyRegionUtils.RegionFillTask() {
public void fillRegion(final HRegion region) throws IOException {
cloneRegion(region, snapshotRegions.get(region.getRegionInfo().getEncodedName()));
}
});
return clonedRegionsInfo;
}
