Examples of org.apache.hadoop.hbase.io.hfile.LruBlockCache

Package org.apache.hadoop.hbase.io.hfile

Examples of org.apache.hadoop.hbase.io.hfile.LruBlockCache

org.apache.hadoop.hbase.io.hfile.LruBlockCache
A block cache implementation that is memory-aware using {@link HeapSize}, memory-bound using an LRU eviction algorithm, and concurrent: backed by a {@link ConcurrentHashMap} and with a non-blocking eviction thread givingconstant-time {@link #cacheBlock} and {@link #getBlock} operations.
Contains three levels of block priority to allow for scan-resistance and in-memory families. A block is added with an inMemory flag if necessary, otherwise a block becomes a single access priority. Once a blocked is accessed again, it changes to multiple access. This is used to prevent scans from thrashing the cache, adding a least-frequently-used element to the eviction algorithm.
Each priority is given its own chunk of the total cache to ensure fairness during eviction. Each priority will retain close to its maximum size, however, if any priority is not using its entire chunk the others are able to grow beyond their chunk size.
Instantiated at a minimum with the total size and average block size. All sizes are in bytes. The block size is not especially important as this cache is fully dynamic in its sizing of blocks. It is only used for pre-allocating data structures and in initial heap estimation of the map.
The detailed constructor defines the sizes for the three priorities (they should total to the maximum size defined). It also sets the levels that trigger and control the eviction thread.
The acceptable size is the cache size level which triggers the eviction process to start. It evicts enough blocks to get the size below the minimum size specified.
Eviction happens in a separate thread and involves a single full-scan of the map. It determines how many bytes must be freed to reach the minimum size, and then while scanning determines the fewest least-recently-used blocks necessary from each of the three priorities (would be 3 times bytes to free). It then uses the priority chunk sizes to evict fairly according to the relative sizes and usage.

    // Calculate the amount of heap to give the heap.
    MemoryUsage mu = ManagementFactory.getMemoryMXBean().getHeapMemoryUsage();
    long cacheSize = (long)(mu.getMax() * cachePercentage);
    LOG.info("Allocating LruBlockCache with maximum size " +
      StringUtils.humanReadableInt(cacheSize));
    hfileBlockCache = new LruBlockCache(cacheSize, DEFAULT_BLOCKSIZE_SMALL);
    return hfileBlockCache;
  }

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      } catch (Exception e) {
        e.printStackTrace();
      }
    }
    // Send cache a shutdown.
    LruBlockCache c = (LruBlockCache)StoreFile.getBlockCache(this.conf);
    if (c != null) c.shutdown();


    // Send interrupts to wake up threads if sleeping so they notice shutdown.
    // TODO: Should we check they are alive?  If OOME could have exited already
    cacheFlusher.interruptIfNecessary();
    hlogFlusher.interrupt();

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    this.metrics.stores.set(stores);
    this.metrics.storefiles.set(storefiles);
    this.metrics.memstoreSizeMB.set((int)(memstoreSize/(1024*1024)));
    this.metrics.storefileIndexSizeMB.set((int)(storefileIndexSize/(1024*1024)));


    LruBlockCache lruBlockCache = (LruBlockCache)StoreFile.getBlockCache(conf);
    if (lruBlockCache != null) {
      this.metrics.blockCacheCount.set(lruBlockCache.size());
      this.metrics.blockCacheFree.set(lruBlockCache.getFreeSize());
      this.metrics.blockCacheSize.set(lruBlockCache.getCurrentSize());
      double ratio = lruBlockCache.getStats().getHitRatio();
      int percent = (int) (ratio * 100);
      this.metrics.blockCacheHitRatio.set(percent);
    }
  }

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      } catch (Exception e) {
        e.printStackTrace();
      }
    }
    // Send cache a shutdown.
    LruBlockCache c = (LruBlockCache)StoreFile.getBlockCache(this.conf);
    if (c != null) c.shutdown();


    // Send interrupts to wake up threads if sleeping so they notice shutdown.
    // TODO: Should we check they are alive?  If OOME could have exited already
    cacheFlusher.interruptIfNecessary();
    hlogFlusher.interrupt();

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    this.metrics.stores.set(stores);
    this.metrics.storefiles.set(storefiles);
    this.metrics.memstoreSizeMB.set((int)(memstoreSize/(1024*1024)));
    this.metrics.storefileIndexSizeMB.set((int)(storefileIndexSize/(1024*1024)));


    LruBlockCache lruBlockCache = (LruBlockCache)StoreFile.getBlockCache(conf);
    if (lruBlockCache != null) {
      this.metrics.blockCacheCount.set(lruBlockCache.size());
      this.metrics.blockCacheFree.set(lruBlockCache.getFreeSize());
      this.metrics.blockCacheSize.set(lruBlockCache.getCurrentSize());
      double ratio = lruBlockCache.getStats().getHitRatio();
      int percent = (int) (ratio * 100);
      this.metrics.blockCacheHitRatio.set(percent);
    }
  }

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      } catch (Exception e) {
        e.printStackTrace();
      }
    }
    // Send cache a shutdown.
    LruBlockCache c = (LruBlockCache) StoreFile.getBlockCache(this.conf);
    if (c != null) {
      c.shutdown();
    }


    // Send interrupts to wake up threads if sleeping so they notice shutdown.
    // TODO: Should we check they are alive? If OOME could have exited already
    if (this.cacheFlusher != null) this.cacheFlusher.interruptIfNecessary();

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    this.metrics.compactionQueueSize.set(compactSplitThread
        .getCompactionQueueSize());
    this.metrics.flushQueueSize.set(cacheFlusher
        .getFlushQueueSize());


    LruBlockCache lruBlockCache = (LruBlockCache) StoreFile.getBlockCache(conf);
    if (lruBlockCache != null) {
      this.metrics.blockCacheCount.set(lruBlockCache.size());
      this.metrics.blockCacheFree.set(lruBlockCache.getFreeSize());
      this.metrics.blockCacheSize.set(lruBlockCache.getCurrentSize());
      CacheStats cacheStats = lruBlockCache.getStats();
      this.metrics.blockCacheHitCount.set(cacheStats.getHitCount());
      this.metrics.blockCacheMissCount.set(cacheStats.getMissCount());
      this.metrics.blockCacheEvictedCount.set(lruBlockCache.getEvictedCount());
      double ratio = lruBlockCache.getStats().getHitRatio();
      int percent = (int) (ratio * 100);
      this.metrics.blockCacheHitRatio.set(percent);
      ratio = lruBlockCache.getStats().getHitCachingRatio();
      percent = (int) (ratio * 100);
      this.metrics.blockCacheHitCachingRatio.set(percent);
    }
  }

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    // Calculate the amount of heap to give the heap.
    MemoryUsage mu = ManagementFactory.getMemoryMXBean().getHeapMemoryUsage();
    long cacheSize = (long)(mu.getMax() * cachePercentage);
    LOG.info("Allocating LruBlockCache with maximum size " +
      StringUtils.humanReadableInt(cacheSize));
    hfileBlockCache = new LruBlockCache(cacheSize, DEFAULT_BLOCKSIZE_SMALL);
    return hfileBlockCache;
  }

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    // Calculate the amount of heap to give the heap.
    MemoryUsage mu = ManagementFactory.getMemoryMXBean().getHeapMemoryUsage();
    long cacheSize = (long)(mu.getMax() * cachePercentage);
    LOG.info("Allocating LruBlockCache with maximum size " +
      StringUtils.humanReadableInt(cacheSize));
    hfileBlockCache = new LruBlockCache(cacheSize, DEFAULT_BLOCKSIZE_SMALL);
    return hfileBlockCache;
  }

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      } catch (Exception e) {
        e.printStackTrace();
      }
    }
    // Send cache a shutdown.
    LruBlockCache c = (LruBlockCache) StoreFile.getBlockCache(this.conf);
    if (c != null) {
      c.shutdown();
    }


    // Send interrupts to wake up threads if sleeping so they notice shutdown.
    // TODO: Should we check they are alive? If OOME could have exited already
    if (this.cacheFlusher != null) this.cacheFlusher.interruptIfNecessary();

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