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The Apache Cassandra Project develops a highly scalable second-generation distributed database, bringing together Dynamo's fully distributed design and Bigtable's ColumnFamily-based data model.
/*
* 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.cassandra.utils;
import java.util.concurrent.locks.ReentrantLock;
import org.apache.cassandra.cache.*;
import org.apache.cassandra.metrics.CassandraMetricsRegistry;
import org.apache.cassandra.metrics.ThreadPoolMetrics;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.apache.cassandra.config.DatabaseDescriptor;
import org.apache.cassandra.db.ColumnFamilyStore;
import org.apache.cassandra.db.RowIndexEntry;
import org.apache.cassandra.db.compaction.CompactionManager;
import org.apache.cassandra.net.MessagingService;
import org.apache.cassandra.service.CacheService;
public class StatusLogger
{
private static final Logger logger = LoggerFactory.getLogger(StatusLogger.class);
private static final ReentrantLock busyMonitor = new ReentrantLock();
public static void log()
{
// avoid logging more than once at the same time. throw away any attempts to log concurrently, as it would be
// confusing and noisy for operators - and don't bother logging again, immediately as it'll just be the same data
if (busyMonitor.tryLock())
{
try
{
logStatus();
}
finally
{
busyMonitor.unlock();
}
}
else
{
logger.trace("StatusLogger is busy");
}
}
private static void logStatus()
{
// everything from o.a.c.concurrent
logger.info(String.format("%-28s%10s%10s%15s%10s%18s", "Pool Name", "Active", "Pending", "Completed", "Blocked", "All Time Blocked"));
for (ThreadPoolMetrics tpool : CassandraMetricsRegistry.Metrics.allThreadPoolMetrics())
{
logger.info(String.format("%-28s%10s%10s%15s%10s%18s",
tpool.poolName,
tpool.activeTasks.getValue(),
tpool.pendingTasks.getValue(),
tpool.completedTasks.getValue(),
tpool.currentBlocked.getCount(),
tpool.totalBlocked.getCount()));
}
// one offs
logger.info(String.format("%-25s%10s%10s",
"CompactionManager", CompactionManager.instance.getActiveCompactions(), CompactionManager.instance.getPendingTasks()));
int pendingLargeMessages = 0;
for (int n : MessagingService.instance().getLargeMessagePendingTasks().values())
{
pendingLargeMessages += n;
}
int pendingSmallMessages = 0;
for (int n : MessagingService.instance().getSmallMessagePendingTasks().values())
{
pendingSmallMessages += n;
}
logger.info(String.format("%-25s%10s%10s",
"MessagingService", "n/a", pendingLargeMessages + "/" + pendingSmallMessages));
// Global key/row cache information
AutoSavingCache keyCache = CacheService.instance.keyCache;
AutoSavingCache rowCache = CacheService.instance.rowCache;
int keyCacheKeysToSave = DatabaseDescriptor.getKeyCacheKeysToSave();
int rowCacheKeysToSave = DatabaseDescriptor.getRowCacheKeysToSave();
logger.info(String.format("%-25s%10s%25s%25s",
"Cache Type", "Size", "Capacity", "KeysToSave"));
logger.info(String.format("%-25s%10s%25s%25s",
"KeyCache",
keyCache.weightedSize(),
keyCache.getCapacity(),
keyCacheKeysToSave == Integer.MAX_VALUE ? "all" : keyCacheKeysToSave));
logger.info(String.format("%-25s%10s%25s%25s",
"RowCache",
rowCache.weightedSize(),
rowCache.getCapacity(),
rowCacheKeysToSave == Integer.MAX_VALUE ? "all" : rowCacheKeysToSave));
// per-CF stats
logger.info(String.format("%-25s%20s", "Table", "Memtable ops,data"));
for (ColumnFamilyStore cfs : ColumnFamilyStore.all())
{
logger.info(String.format("%-25s%20s",
cfs.keyspace.getName() + "." + cfs.name,
cfs.metric.memtableColumnsCount.getValue() + "," + cfs.metric.memtableLiveDataSize.getValue()));
}
}
}