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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 org.hyperic.sigar.*;
import org.slf4j.LoggerFactory;
import org.slf4j.Logger;
import org.apache.cassandra.config.CassandraRelevantProperties;
@Shared
public class SigarLibrary
{
private Logger logger = LoggerFactory.getLogger(SigarLibrary.class);
public static final SigarLibrary instance = new SigarLibrary();
private Sigar sigar;
private FileSystemMap mounts = null;
private boolean initialized = false;
private long INFINITY = -1;
private long EXPECTED_MIN_NOFILE = 10000l; // number of files that can be opened
private long EXPECTED_NPROC = 32768l; // number of processes
private long EXPECTED_AS = INFINITY; // address space
// TODO: Determine memlock limits if possible
// TODO: Determine if file system is remote or local
// TODO: Determine if disk latency is within acceptable limits
private SigarLibrary()
{
logger.info("Initializing SIGAR library");
try
{
sigar = new Sigar();
mounts = sigar.getFileSystemMap();
initialized = true;
}
catch (SigarException e)
{
logger.info("Could not initialize SIGAR library {} ", e.getMessage());
}
catch (UnsatisfiedLinkError linkError)
{
logger.info("Could not initialize SIGAR library {} ", linkError.getMessage());
}
}
/**
*
* @return true or false indicating if sigar was successfully initialized
*/
public boolean initialized()
{
return initialized;
}
private boolean hasAcceptableProcNumber()
{
try
{
long fileMax = sigar.getResourceLimit().getProcessesMax();
if (fileMax >= EXPECTED_NPROC || fileMax == INFINITY)
{
return true;
}
else
{
return false;
}
}
catch (SigarException sigarException)
{
logger.warn("Could not determine if max processes was acceptable. Error message: {}", sigarException);
return false;
}
}
private boolean hasAcceptableFileLimits()
{
try
{
long fileMax = sigar.getResourceLimit().getOpenFilesMax();
if (fileMax >= EXPECTED_MIN_NOFILE || fileMax == INFINITY)
{
return true;
}
else
{
return false;
}
}
catch (SigarException sigarException)
{
logger.warn("Could not determine if max open file handle limit is correctly configured. Error message: {}", sigarException);
return false;
}
}
private boolean hasAcceptableAddressSpace()
{
try
{
long fileMax = sigar.getResourceLimit().getVirtualMemoryMax();
if (fileMax == EXPECTED_AS)
{
return true;
}
else
{
return false;
}
}
catch (SigarException sigarException)
{
logger.warn("Could not determine if VirtualMemoryMax was acceptable. Error message: {}", sigarException);
return false;
}
}
private boolean isSwapEnabled()
{
try
{
Swap swap = sigar.getSwap();
long swapSize = swap.getTotal();
if (swapSize > 0)
{
return true;
}
else
{
return false;
}
}
catch (SigarException sigarException)
{
logger.warn("Could not determine if swap configuration is acceptable. Error message: {}", sigarException);
return false;
}
}
public long getPid()
{
return initialized ? sigar.getPid() : -1;
}
public void warnIfRunningInDegradedMode()
{
if (initialized)
{
boolean swapEnabled = isSwapEnabled();
boolean goodAddressSpace = hasAcceptableAddressSpace();
boolean goodFileLimits = hasAcceptableFileLimits();
boolean goodProcNumber = hasAcceptableProcNumber();
if (swapEnabled || !goodAddressSpace || !goodFileLimits || !goodProcNumber || CassandraRelevantProperties.TEST_IGNORE_SIGAR.getBoolean())
{
logger.warn("Cassandra server running in degraded mode. Is swap disabled? : {}, Address space adequate? : {}, " +
" nofile limit adequate? : {}, nproc limit adequate? : {} ", !swapEnabled, goodAddressSpace,
goodFileLimits, goodProcNumber );
}
else
{
logger.info("Checked OS settings and found them configured for optimal performance.");
}
}
else
{
logger.info("Sigar could not be initialized, test for checking degraded mode omitted.");
}
}
}