@Override
protected void updateMeta(final byte[] oldRegion1, final byte[] oldRegion2, HRegion newRegion)
throws IOException {
byte[][] regionsToDelete = {oldRegion1, oldRegion2};
for (int r = 0; r < regionsToDelete.length; r++) {
Delete delete = new Delete(regionsToDelete[r]);
delete.deleteColumns(HConstants.CATALOG_FAMILY, HConstants.REGIONINFO_QUALIFIER);
delete.deleteColumns(HConstants.CATALOG_FAMILY, HConstants.SERVER_QUALIFIER);
delete.deleteColumns(HConstants.CATALOG_FAMILY, HConstants.STARTCODE_QUALIFIER);
delete.deleteColumns(HConstants.CATALOG_FAMILY, HConstants.SPLITA_QUALIFIER);
delete.deleteColumns(HConstants.CATALOG_FAMILY, HConstants.SPLITB_QUALIFIER);
root.delete(delete, null, true);
if (LOG.isDebugEnabled()) {
LOG.debug("updated columns in row: " + Bytes.toStringBinary(regionsToDelete[r]));
}
}
HRegionInfo newInfo = newRegion.getRegionInfo();
newInfo.setOffline(true);
Put put = new Put(newRegion.getRegionName());
put.add(
HConstants.CATALOG_FAMILY, HConstants.REGIONINFO_QUALIFIER, Writables.getBytes(newInfo));
root.put(put);
if (LOG.isDebugEnabled()) {
LOG.debug("updated columns in row: " + Bytes.toStringBinary(newRegion.getRegionName()));
}
}
@Override
protected void updateMeta(final byte[] oldRegion1, final byte[] oldRegion2, HRegion newRegion)
throws IOException {
byte[][] regionsToDelete = {oldRegion1, oldRegion2};
for (int r = 0; r < regionsToDelete.length; r++) {
if (Bytes.equals(regionsToDelete[r], latestRegion.getRegionName())) {
latestRegion = null;
}
Delete delete = new Delete(regionsToDelete[r]);
table.delete(delete);
if (LOG.isDebugEnabled()) {
LOG.debug("updated columns in row: " + Bytes.toStringBinary(regionsToDelete[r]));
}
}
newRegion.getRegionInfo().setOffline(true);
Put put = new Put(newRegion.getRegionName());
put.add(
HConstants.CATALOG_FAMILY,
HConstants.REGIONINFO_QUALIFIER,
Writables.getBytes(newRegion.getRegionInfo()));
table.put(put);
if (LOG.isDebugEnabled()) {
LOG.debug("updated columns in row: " + Bytes.toStringBinary(newRegion.getRegionName()));
}
}
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;
}
/**
* Unfortunately, the easiest way to test this is to spin up a mini-cluster since we want to do
* the usual compaction mechanism on the region, rather than going through the backdoor to the
* region
*/
@Test
public void testRegionObserverCompactionTimeStacking() throws Exception {
// setup a mini cluster so we can do a real compaction on a region
Configuration conf = UTIL.getConfiguration();
conf.setClass(HConstants.REGION_IMPL, CompactionCompletionNotifyingRegion.class, HRegion.class);
conf.setInt("hbase.hstore.compaction.min", 2);
UTIL.startMiniCluster();
String tableName = "testRegionObserverCompactionTimeStacking";
byte[] ROW = Bytes.toBytes("testRow");
byte[] A = Bytes.toBytes("A");
HTableDescriptor desc = new HTableDescriptor(TableName.valueOf(tableName));
desc.addFamily(new HColumnDescriptor(A));
desc.addCoprocessor(EmptyRegionObsever.class.getName(), null, Coprocessor.PRIORITY_USER, null);
desc.addCoprocessor(
NoDataFromCompaction.class.getName(), null, Coprocessor.PRIORITY_HIGHEST, null);
Admin admin = UTIL.getHBaseAdmin();
admin.createTable(desc);
Table table = UTIL.getConnection().getTable(desc.getTableName());
// put a row and flush it to disk
Put put = new Put(ROW);
put.add(A, A, A);
table.put(put);
HRegionServer rs = UTIL.getRSForFirstRegionInTable(desc.getTableName());
List<HRegion> regions = rs.getOnlineRegions(desc.getTableName());
assertEquals("More than 1 region serving test table with 1 row", 1, regions.size());
HRegion region = regions.get(0);
admin.flushRegion(region.getRegionName());
CountDownLatch latch =
((CompactionCompletionNotifyingRegion) region).getCompactionStateChangeLatch();
// put another row and flush that too
put = new Put(Bytes.toBytes("anotherrow"));
put.add(A, A, A);
table.put(put);
admin.flushRegion(region.getRegionName());
// run a compaction, which normally would should get rid of the data
// wait for the compaction checker to complete
latch.await();
// check both rows to ensure that they aren't there
Get get = new Get(ROW);
Result r = table.get(get);
assertNull(
"Got an unexpected number of rows - no data should be returned with the NoDataFromScan coprocessor. Found: "
+ r,
r.listCells());
get = new Get(Bytes.toBytes("anotherrow"));
r = table.get(get);
assertNull(
"Got an unexpected number of rows - no data should be returned with the NoDataFromScan coprocessor Found: "
+ r,
r.listCells());
table.close();
UTIL.shutdownMiniCluster();
}