org.apache.bookkeeper.metastore.MetastoreUtils Maven / Gradle / Ivy
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.bookkeeper.metastore;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.atomic.AtomicInteger;
import org.apache.bookkeeper.metastore.MSException.Code;
import org.apache.bookkeeper.versioning.Version;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Provides utilities for metastore.
*/
public class MetastoreUtils {
private static final Logger logger = LoggerFactory.getLogger(MetastoreUtils.class);
static class MultiMetastoreCallback implements MetastoreCallback {
int rc = Code.OK.getCode();
final int numOps;
final AtomicInteger numFinished = new AtomicInteger(0);
final CountDownLatch doneLatch = new CountDownLatch(1);
MultiMetastoreCallback(int numOps) {
this.numOps = numOps;
}
@Override
public void complete(int rc, T value, Object ctx) {
if (Code.OK.getCode() != rc) {
this.rc = rc;
doneLatch.countDown();
return;
}
if (numFinished.incrementAndGet() == numOps) {
doneLatch.countDown();
}
}
public void waitUntilAllFinished() throws MSException, InterruptedException {
doneLatch.await();
if (Code.OK.getCode() != rc) {
throw MSException.create(Code.get(rc));
}
}
}
static class SyncMetastoreCallback implements MetastoreCallback {
int rc;
T result;
final CountDownLatch doneLatch = new CountDownLatch(1);
@Override
public void complete(int rc, T value, Object ctx) {
this.rc = rc;
result = value;
doneLatch.countDown();
}
public T getResult() throws MSException, InterruptedException {
doneLatch.await();
if (Code.OK.getCode() != rc) {
throw MSException.create(Code.get(rc));
}
return result;
}
}
/**
* Clean the given table.
*
* @param table
* Metastore Table.
* @param numEntriesPerScan
* Num entries per scan.
* @throws MSException
* @throws InterruptedException
*/
public static void cleanTable(MetastoreTable table, int numEntriesPerScan)
throws MSException, InterruptedException {
// open cursor
SyncMetastoreCallback openCb = new SyncMetastoreCallback();
table.openCursor(MetastoreTable.NON_FIELDS, openCb, null);
MetastoreCursor cursor = openCb.getResult();
logger.info("Open cursor for table {} to clean entries.", table.getName());
List keysToClean = new ArrayList(numEntriesPerScan);
int numEntriesRemoved = 0;
while (cursor.hasMoreEntries()) {
logger.info("Fetching next {} entries from table {} to clean.",
numEntriesPerScan, table.getName());
Iterator iter = cursor.readEntries(numEntriesPerScan);
keysToClean.clear();
while (iter.hasNext()) {
MetastoreTableItem item = iter.next();
String key = item.getKey();
keysToClean.add(key);
}
if (keysToClean.isEmpty()) {
continue;
}
logger.info("Issuing deletes to delete keys {}", keysToClean);
// issue deletes to delete batch of keys
MultiMetastoreCallback mcb = new MultiMetastoreCallback(keysToClean.size());
for (String key : keysToClean) {
table.remove(key, Version.ANY, mcb, null);
}
mcb.waitUntilAllFinished();
numEntriesRemoved += keysToClean.size();
logger.info("Removed {} entries from table {}.", numEntriesRemoved, table.getName());
}
logger.info("Finished cleaning up table {}.", table.getName());
}
}