protected boolean merge(final HRegionInfo[] info) throws IOException {
if (info.length < 2) {
LOG.info("only one region - nothing to merge");
return false;
}
HRegion currentRegion = null;
long currentSize = 0;
HRegion nextRegion = null;
long nextSize = 0;
for (int i = 0; i < info.length - 1; i++) {
if (currentRegion == null) {
currentRegion = HRegion.newHRegion(tabledir, hlog, fs, conf, info[i], this.htd, null);
currentRegion.initialize();
currentSize = currentRegion.getLargestHStoreSize();
}
nextRegion = HRegion.newHRegion(tabledir, hlog, fs, conf, info[i + 1], this.htd, null);
nextRegion.initialize();
nextSize = nextRegion.getLargestHStoreSize();
if ((currentSize + nextSize) <= (maxFilesize / 2)) {
// We merge two adjacent regions if their total size is less than
// one half of the desired maximum size
LOG.info(
"Merging regions "
+ currentRegion.getRegionNameAsString()
+ " and "
+ nextRegion.getRegionNameAsString());
HRegion mergedRegion = HRegion.mergeAdjacent(currentRegion, nextRegion);
updateMeta(currentRegion.getRegionName(), nextRegion.getRegionName(), mergedRegion);
break;
}
LOG.info(
"not merging regions "
+ Bytes.toStringBinary(currentRegion.getRegionName())
+ " and "
+ Bytes.toStringBinary(nextRegion.getRegionName()));
currentRegion.close();
currentRegion = nextRegion;
currentSize = nextSize;
}
if (currentRegion != null) {
currentRegion.close();
}
return true;
}
OfflineMerger(Configuration conf, FileSystem fs) throws IOException {
super(conf, fs, HConstants.META_TABLE_NAME);
Path rootTableDir =
HTableDescriptor.getTableDir(
fs.makeQualified(new Path(conf.get(HConstants.HBASE_DIR))),
HConstants.ROOT_TABLE_NAME);
// Scan root region to find all the meta regions
root =
HRegion.newHRegion(
rootTableDir,
hlog,
fs,
conf,
HRegionInfo.ROOT_REGIONINFO,
HTableDescriptor.ROOT_TABLEDESC,
null);
root.initialize();
Scan scan = new Scan();
scan.addColumn(HConstants.CATALOG_FAMILY, HConstants.REGIONINFO_QUALIFIER);
InternalScanner rootScanner = root.getScanner(scan);
try {
List<KeyValue> results = new ArrayList<KeyValue>();
boolean hasMore;
do {
hasMore = rootScanner.next(results);
for (KeyValue kv : results) {
HRegionInfo info = Writables.getHRegionInfoOrNull(kv.getValue());
if (info != null) {
metaRegions.add(info);
}
}
} while (hasMore);
} finally {
rootScanner.close();
try {
root.close();
} catch (IOException e) {
LOG.error(e);
}
}
}