本文整理汇总了Java中org.apache.hadoop.hbase.util.DirectMemoryUtils类的典型用法代码示例。如果您正苦于以下问题：Java DirectMemoryUtils类的具体用法？Java DirectMemoryUtils怎么用？Java DirectMemoryUtils使用的例子？那么恭喜您, 这里精选的类代码示例或许可以为您提供帮助。
DirectMemoryUtils类属于org.apache.hadoop.hbase.util包，在下文中一共展示了DirectMemoryUtils类的4个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的Java代码示例。
示例1: instantiateBlockCache
import org.apache.hadoop.hbase.util.DirectMemoryUtils; //导入依赖的package包/类
/**
* Returns the block cache or <code>null</code> in case none should be used.
* @param conf The current configuration.
* @return The block cache or <code>null</code>.
*/
private static synchronized BlockCache instantiateBlockCache(Configuration conf) {
if (globalBlockCache != null) return globalBlockCache;
if (blockCacheDisabled) return null;
float cachePercentage =
conf.getFloat(HConstants.HFILE_BLOCK_CACHE_SIZE_KEY,
HConstants.HFILE_BLOCK_CACHE_SIZE_DEFAULT);
if (cachePercentage == 0L) {
blockCacheDisabled = true;
return null;
}
if (cachePercentage > 1.0) {
throw new IllegalArgumentException(HConstants.HFILE_BLOCK_CACHE_SIZE_KEY
+ " must be between 0.0 and 1.0, and not > 1.0");
}
// Calculate the amount of heap to give the heap.
MemoryUsage mu = ManagementFactory.getMemoryMXBean().getHeapMemoryUsage();
long cacheSize = (long) (mu.getMax() * cachePercentage);
int blockSize = conf.getInt("hbase.offheapcache.minblocksize", HFile.DEFAULT_BLOCKSIZE);
long offHeapCacheSize =
(long) (conf.getFloat("hbase.offheapcache.percentage", (float) 0) * DirectMemoryUtils
.getDirectMemorySize());
LOG.info("Allocating LruBlockCache with maximum size "
+ StringUtils.humanReadableInt(cacheSize));
if (offHeapCacheSize <= 0) {
globalBlockCache = new LruBlockCache(cacheSize, StoreFile.DEFAULT_BLOCKSIZE_SMALL, conf);
} else {
globalBlockCache =
new DoubleBlockCache(cacheSize, offHeapCacheSize, StoreFile.DEFAULT_BLOCKSIZE_SMALL,
blockSize, conf);
}
return globalBlockCache;
}
示例2: shutdown
import org.apache.hadoop.hbase.util.DirectMemoryUtils; //导入依赖的package包/类
void shutdown() {
for (ByteBuffer aSlab : slabs) {
try {
DirectMemoryUtils.destroyDirectByteBuffer(aSlab);
} catch (Exception e) {
LOG.warn("Unable to deallocate direct memory during shutdown", e);
}
}
}
示例3: instantiateBlockCache
import org.apache.hadoop.hbase.util.DirectMemoryUtils; //导入依赖的package包/类
/**
* Returns the block cache or <code>null</code> in case none should be used.
*
* @param conf The current configuration.
* @return The block cache or <code>null</code>.
*/
private static synchronized BlockCache instantiateBlockCache(
Configuration conf) {
if (globalBlockCache != null) return globalBlockCache;
if (blockCacheDisabled) return null;
float cachePercentage = conf.getFloat(HConstants.HFILE_BLOCK_CACHE_SIZE_KEY,
HConstants.HFILE_BLOCK_CACHE_SIZE_DEFAULT);
if (cachePercentage == 0L) {
blockCacheDisabled = true;
return null;
}
if (cachePercentage > 1.0) {
throw new IllegalArgumentException(HConstants.HFILE_BLOCK_CACHE_SIZE_KEY +
" must be between 0.0 and 1.0, and not > 1.0");
}
// Calculate the amount of heap to give the heap.
MemoryUsage mu = ManagementFactory.getMemoryMXBean().getHeapMemoryUsage();
long cacheSize = (long)(mu.getMax() * cachePercentage);
int blockSize = conf.getInt("hbase.offheapcache.minblocksize",
HFile.DEFAULT_BLOCKSIZE);
long offHeapCacheSize =
(long) (conf.getFloat("hbase.offheapcache.percentage", (float) 0) *
DirectMemoryUtils.getDirectMemorySize());
LOG.info("Allocating LruBlockCache with maximum size " +
StringUtils.humanReadableInt(cacheSize));
if (offHeapCacheSize <= 0) {
globalBlockCache = new LruBlockCache(cacheSize,
StoreFile.DEFAULT_BLOCKSIZE_SMALL, conf);
} else {
globalBlockCache = new DoubleBlockCache(cacheSize, offHeapCacheSize,
StoreFile.DEFAULT_BLOCKSIZE_SMALL, blockSize, conf);
}
return globalBlockCache;
}
示例4: instantiateBlockCache
import org.apache.hadoop.hbase.util.DirectMemoryUtils; //导入依赖的package包/类
/**
* Returns the block cache or <code>null</code> in case none should be used.
*
* @param conf The current configuration.
* @return The block cache or <code>null</code>.
*/
private static synchronized BlockCache instantiateBlockCache(
Configuration conf) {
if (globalBlockCache != null) return globalBlockCache;
if (blockCacheDisabled) return null;
float cachePercentage = conf.getFloat(HConstants.HFILE_BLOCK_CACHE_SIZE_KEY,
HConstants.HFILE_BLOCK_CACHE_SIZE_DEFAULT);
if (cachePercentage == 0L) {
blockCacheDisabled = true;
return null;
}
if (cachePercentage > 1.0) {
throw new IllegalArgumentException(HConstants.HFILE_BLOCK_CACHE_SIZE_KEY +
" must be between 0.0 and 1.0, and not > 1.0");
}
// Calculate the amount of heap to give the heap.
MemoryUsage mu = ManagementFactory.getMemoryMXBean().getHeapMemoryUsage();
long cacheSize = (long)(mu.getMax() * cachePercentage);
int blockSize = conf.getInt("hbase.offheapcache.minblocksize",
HFile.DEFAULT_BLOCKSIZE);
long offHeapCacheSize =
(long) (conf.getFloat("hbase.offheapcache.percentage", (float) 0) *
DirectMemoryUtils.getDirectMemorySize());
LOG.info("Allocating LruBlockCache with maximum size " +
StringUtils.humanReadableInt(cacheSize));
if (offHeapCacheSize <= 0) {
globalBlockCache = new LruBlockCache(cacheSize,
StoreFile.DEFAULT_BLOCKSIZE_SMALL);
} else {
globalBlockCache = new DoubleBlockCache(cacheSize, offHeapCacheSize,
StoreFile.DEFAULT_BLOCKSIZE_SMALL, blockSize, conf);
}
return globalBlockCache;
}