/*
 * 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.hadoop.hbase.regionserver;

import java.util.List;
import org.apache.yetus.audience.InterfaceAudience;

/**
 * This is the interface that will expose RegionServer information to hadoop1/hadoop2
 * implementations of the MetricsRegionServerSource.
 */
@InterfaceAudience.Private
public interface MetricsRegionServerWrapper {

  /**
   * Get ServerName
   */
  String getServerName();

  /**
   * Get the Cluster ID
   * @return Cluster ID
   */
  String getClusterId();

  /**
   * Get the ZooKeeper Quorum Info
   * @return ZooKeeper Quorum Info
   */
  String getZookeeperQuorum();

  /**
   * Get the co-processors
   * @return Co-processors
   */
  String getCoprocessors();

  /**
   * Get HRegionServer start time
   * @return Start time of RegionServer in milliseconds
   */
  long getStartCode();

  /**
   * The number of online regions
   */
  long getNumOnlineRegions();

  /**
   * Get the number of stores hosted on this region server.
   */
  long getNumStores();

  /**
   * Get the number of WAL files of this region server.
   */
  long getNumWALFiles();

  /**
   * Get the size of WAL files of this region server.
   */
  long getWALFileSize();

  /**
   * Get the excluded datanodes in the cache of this region server.
   */
  List<String> getWALExcludeDNs();

  /**
   * Get the number of WAL files with slow appends for this region server.
   */
  long getNumWALSlowAppend();

  /**
   * Get the number of store files hosted on this region server.
   */
  long getNumStoreFiles();

  /**
   * Get the max number of store files across all regions of this region server.
   */
  long getMaxStoreFiles();

  /**
   * Get the size of the memstore on this region server.
   */
  long getMemStoreSize();

  /**
   * Get the size of the on heap memstore on this region server.
   */
  long getOnHeapMemStoreSize();

  /**
   * Get the size of the off heap memstore on this region server.
   */
  long getOffHeapMemStoreSize();

  /**
   * Get the total size of the store files this region server is serving from.
   */
  long getStoreFileSize();

  /** Returns Max age of store files hosted on this region server */
  long getMaxStoreFileAge();

  /** Returns Min age of store files hosted on this region server */
  long getMinStoreFileAge();

  /** Returns Average age of store files hosted on this region server */
  long getAvgStoreFileAge();

  /** Returns Number of reference files on this region server */
  long getNumReferenceFiles();

  /**
   * Get the number of requests per second.
   */
  double getRequestsPerSecond();

  /**
   * Get the total number of requests per second.
   */
  long getTotalRequestCount();

  /**
   * Get the number of read requests to regions hosted on this region server.
   */
  long getReadRequestsCount();

  /**
   * Get the rate of read requests per second to regions hosted on this region server.
   */
  double getReadRequestsRatePerSecond();

  /**
   * Get the number of filtered read requests to regions hosted on this region server.
   */
  long getFilteredReadRequestsCount();

  /**
   * Get the number of write requests to regions hosted on this region server.
   */
  long getWriteRequestsCount();

  /**
   * Get the rate of write requests per second to regions hosted on this region server.
   */
  double getWriteRequestsRatePerSecond();

  /**
   * Get the number of CAS operations that failed.
   */
  long getCheckAndMutateChecksFailed();

  /**
   * Get the number of CAS operations that passed.
   */
  long getCheckAndMutateChecksPassed();

  /**
   * Get the Size (in bytes) of indexes in storefiles on disk.
   */
  long getStoreFileIndexSize();

  /**
   * Get the size (in bytes) of of the static indexes including the roots.
   */
  long getTotalStaticIndexSize();

  /**
   * Get the size (in bytes) of the static bloom filters.
   */
  long getTotalStaticBloomSize();

  /**
   * Count of bloom filter requests.
   */
  long getBloomFilterRequestsCount();

  /**
   * Count of bloom filter requests which return a negative result.
   */
  long getBloomFilterNegativeResultsCount();

  /**
   * Count of requests which could have used bloom filters, but they weren't configured or loaded.
   */
  long getBloomFilterEligibleRequestsCount();

  /**
   * Number of mutations received with WAL explicitly turned off.
   */
  long getNumMutationsWithoutWAL();

  /**
   * Ammount of data in the memstore but not in the WAL because mutations explicitly had their WAL
   * turned off.
   */
  long getDataInMemoryWithoutWAL();

  /**
   * Get the percent of HFiles' that are local.
   */
  double getPercentFileLocal();

  /**
   * Get the percent of HFiles' that are local for secondary region replicas.
   */
  double getPercentFileLocalSecondaryRegions();

  /**
   * Get the size of the split queue
   */
  int getSplitQueueSize();

  /**
   * Get the size of the compaction queue
   */
  int getCompactionQueueSize();

  int getSmallCompactionQueueSize();

  int getLargeCompactionQueueSize();

  /**
   * Get the size of the flush queue.
   */
  int getFlushQueueSize();

  /**
   * Get the limit size of the off heap memstore (if enabled), otherwise get the limit size of the
   * on heap memstore.
   */
  long getMemStoreLimit();

  /**
   * Get the limit size of the on heap memstore.
   */
  long getOnHeapMemStoreLimit();

  /**
   * Get the limit size of the off heap memstore.
   */
  long getOffHeapMemStoreLimit();

  /**
   * Get the size (in bytes) of the block cache that is free.
   */
  long getBlockCacheFreeSize();

  /**
   * Get the number of items in the block cache.
   */
  long getBlockCacheCount();

  /**
   * Get the number of DATA blocks in the block cache.
   */
  long getBlockCacheDataBlockCount();

  /**
   * Get the total size (in bytes) of the block cache.
   */
  long getBlockCacheSize();

  /**
   * Get the count of hits to the block cache
   */
  long getBlockCacheHitCount();

  /**
   * Get the count of hits to primary replica in the block cache
   */
  long getBlockCachePrimaryHitCount();

  /**
   * Get the count of hits to the block cache, for cacheable requests only.
   */
  long getBlockCacheHitCachingCount();

  /**
   * Get the count of misses to the block cache.
   */
  long getBlockCacheMissCount();

  /**
   * Get the count of misses to primary replica in the block cache.
   */
  long getBlockCachePrimaryMissCount();

  /**
   * Get the count of misses to the block cache, for cacheable requests only.
   */
  long getBlockCacheMissCachingCount();

  /**
   * Get the number of items evicted from the block cache.
   */
  long getBlockCacheEvictedCount();

  /**
   * Get the number of items evicted from primary replica in the block cache.
   */
  long getBlockCachePrimaryEvictedCount();

  /**
   * Get the percent of all requests that hit the block cache.
   */
  double getBlockCacheHitPercent();

  /**
   * Get the percent of requests with the block cache turned on that hit the block cache.
   */
  double getBlockCacheHitCachingPercent();

  /**
   * Number of cache insertions that failed.
   */
  long getBlockCacheFailedInsertions();

  /**
   * Cache size (bytes) of L1 cache
   */
  long getL1CacheSize();

  /**
   * Free cache size (bytes) of L1 cache
   */
  long getL1CacheFreeSize();

  /**
   * Number of blocks in L1 cache
   */
  long getL1CacheCount();

  /**
   * Number of blocks evicted from L1 cache
   */
  long getL1CacheEvictedCount();

  /**
   * Hit count of L1 cache.
   */
  long getL1CacheHitCount();

  /**
   * Miss count of L1 cache.
   */
  long getL1CacheMissCount();

  /**
   * Hit ratio of L1 cache.
   */
  double getL1CacheHitRatio();

  /**
   * Miss ratio of L1 cache.
   */
  double getL1CacheMissRatio();

  /**
   * Cache size (bytes) of L2 cache
   */
  long getL2CacheSize();

  /**
   * Free cache size (bytes) of L2 cache
   */
  long getL2CacheFreeSize();

  /**
   * Number of blocks in L2 cache
   */
  long getL2CacheCount();

  /**
   * Number of blocks evicted from L2 cache
   */
  long getL2CacheEvictedCount();

  /**
   * Hit count of L2 cache.
   */
  long getL2CacheHitCount();

  /**
   * Miss count of L2 cache.
   */
  long getL2CacheMissCount();

  /**
   * Hit ratio of L2 cache.
   */
  double getL2CacheHitRatio();

  /**
   * Miss ratio of L2 cache.
   */
  double getL2CacheMissRatio();

  /**
   * Force a re-computation of the metrics.
   */
  void forceRecompute();

  /**
   * Get the amount of time that updates were blocked.
   */
  long getUpdatesBlockedTime();

  /**
   * Get the number of cells flushed to disk.
   */
  long getFlushedCellsCount();

  /**
   * Get the number of cells processed during minor compactions.
   */
  long getCompactedCellsCount();

  /**
   * Get the number of cells processed during major compactions.
   */
  long getMajorCompactedCellsCount();

  /**
   * Get the total amount of data flushed to disk, in bytes.
   */
  long getFlushedCellsSize();

  /**
   * Get the total amount of data processed during minor compactions, in bytes.
   */
  long getCompactedCellsSize();

  /**
   * Get the total amount of data processed during major compactions, in bytes.
   */
  long getMajorCompactedCellsSize();

  /**
   * Gets the number of cells moved to mob during compaction.
   */
  long getCellsCountCompactedToMob();

  /**
   * Gets the number of cells moved from mob during compaction.
   */
  long getCellsCountCompactedFromMob();

  /**
   * Gets the total amount of cells moved to mob during compaction, in bytes.
   */
  long getCellsSizeCompactedToMob();

  /**
   * Gets the total amount of cells moved from mob during compaction, in bytes.
   */
  long getCellsSizeCompactedFromMob();

  /**
   * Gets the number of the flushes in mob-enabled stores.
   */
  long getMobFlushCount();

  /**
   * Gets the number of mob cells flushed to disk.
   */
  long getMobFlushedCellsCount();

  /**
   * Gets the total amount of mob cells flushed to disk, in bytes.
   */
  long getMobFlushedCellsSize();

  /**
   * Gets the number of scanned mob cells.
   */
  long getMobScanCellsCount();

  /**
   * Gets the total amount of scanned mob cells, in bytes.
   */
  long getMobScanCellsSize();

  /**
   * Gets the count of accesses to the mob file cache.
   */
  long getMobFileCacheAccessCount();

  /**
   * Gets the count of misses to the mob file cache.
   */
  long getMobFileCacheMissCount();

  /**
   * Gets the number of items evicted from the mob file cache.
   */
  long getMobFileCacheEvictedCount();

  /**
   * Gets the count of cached mob files.
   */
  long getMobFileCacheCount();

  /**
   * Gets the hit percent to the mob file cache.
   */
  double getMobFileCacheHitPercent();

  /** Returns Count of hedged read operations */
  long getHedgedReadOps();

  /** Returns Count of times a hedged read beat out the primary read. */
  long getHedgedReadWins();

  /** Returns Count of times a hedged read executes in current thread */
  long getHedgedReadOpsInCurThread();

  /** Returns Number of total bytes read from HDFS. */
  long getTotalBytesRead();

  /** Returns Number of bytes read from the local HDFS DataNode. */
  long getLocalBytesRead();

  /** Returns Number of bytes read locally through HDFS short circuit. */
  long getShortCircuitBytesRead();

  /** Returns Number of bytes read locally through HDFS zero copy. */
  long getZeroCopyBytesRead();

  /**
   * Returns Count of requests blocked because the memstore size is larger than blockingMemStoreSize
   */
  long getBlockedRequestsCount();

  /**
   * Get the number of rpc get requests to this region server.
   */
  long getRpcGetRequestsCount();

  /**
   * Get the number of rpc scan requests to this region server.
   */
  long getRpcScanRequestsCount();

  /**
   * Get the number of full region rpc scan requests to this region server.
   */
  long getRpcFullScanRequestsCount();

  /**
   * Get the number of rpc multi requests to this region server.
   */
  long getRpcMultiRequestsCount();

  /**
   * Get the number of rpc mutate requests to this region server.
   */
  long getRpcMutateRequestsCount();

  /**
   * Get the average region size to this region server.
   */
  long getAverageRegionSize();

  long getDataMissCount();

  long getLeafIndexMissCount();

  long getBloomChunkMissCount();

  long getMetaMissCount();

  long getRootIndexMissCount();

  long getIntermediateIndexMissCount();

  long getFileInfoMissCount();

  long getGeneralBloomMetaMissCount();

  long getDeleteFamilyBloomMissCount();

  long getTrailerMissCount();

  long getDataHitCount();

  long getLeafIndexHitCount();

  long getBloomChunkHitCount();

  long getMetaHitCount();

  long getRootIndexHitCount();

  long getIntermediateIndexHitCount();

  long getFileInfoHitCount();

  long getGeneralBloomMetaHitCount();

  long getDeleteFamilyBloomHitCount();

  long getTrailerHitCount();

  long getTotalRowActionRequestCount();

  long getByteBuffAllocatorHeapAllocationBytes();

  long getByteBuffAllocatorPoolAllocationBytes();

  double getByteBuffAllocatorHeapAllocRatio();

  long getByteBuffAllocatorTotalBufferCount();

  long getByteBuffAllocatorUsedBufferCount();

  int getActiveScanners();
}