import org.apache.hadoop.hbase.coprocessor.WALCoprocessorEnvironment; //导入依赖的package包/类
@Override
public void postWALWrite(ObserverContext<? extends WALCoprocessorEnvironment> ctx,
    HRegionInfo info, WALKey logKey, WALEdit logEdit) throws IOException {
  // only keep primary region's edits
  if (logKey.getTablename().equals(tableName) && info.getReplicaId() == 0) {
    entries.add(new Entry(logKey, logEdit));
  }
}
 

import org.apache.hadoop.hbase.coprocessor.WALCoprocessorEnvironment; //导入依赖的package包/类
@Override
public boolean preWALWrite(ObserverContext<WALCoprocessorEnvironment> ctx, HRegionInfo info,
    HLogKey logKey, WALEdit logEdit) throws IOException {
  TableName tableName = info.getTable();
  if (IndexUtils.isCatalogOrSystemTable(tableName) || IndexUtils.isIndexTable(tableName)) {
    return true;
  }
  List<IndexSpecification> indices = indexManager.getIndicesForTable(tableName.getNameAsString());
  if (indices != null && !indices.isEmpty()) {
    LOG.trace("Entering preWALWrite for the table " + tableName);
    String indexTableName = IndexUtils.getIndexTableName(tableName);
    IndexEdits iEdits = IndexRegionObserver.threadLocal.get();
    WALEdit indexWALEdit = iEdits.getWALEdit();
    // This size will be 0 when none of the Mutations to the user table to be indexed.
    // or write to WAL is disabled for the Mutations
    if (indexWALEdit.getKeyValues().size() == 0) {
      return true;
    }
    LOG.trace("Adding indexWALEdits into WAL for table " + tableName);
    HRegion indexRegion = iEdits.getRegion();
    // TS in all KVs within WALEdit will be the same. So considering the 1st one.
    Long time = indexWALEdit.getKeyValues().get(0).getTimestamp();
    indexRegion.getLog().appendNoSync(indexRegion.getRegionInfo(),
      TableName.valueOf(indexTableName), indexWALEdit, logKey.getClusterIds(), time,
      indexRegion.getTableDesc(), indexRegion.getSequenceId(), true, HConstants.NO_NONCE,
      HConstants.NO_NONCE);
    LOG.trace("Exiting preWALWrite for the table " + tableName);
  }
  return true;
}
 

import org.apache.hadoop.hbase.coprocessor.WALCoprocessorEnvironment; //导入依赖的package包/类
@Override
public void postWALWrite(ObserverContext<? extends WALCoprocessorEnvironment> ctx,
                         RegionInfo info, WALKey logKey, WALEdit logEdit) throws IOException {
  // only keep primary region's edits
  if (logKey.getTableName().equals(tableName) && info.getReplicaId() == 0) {
    // Presume type is a WALKeyImpl
    entries.add(new Entry((WALKeyImpl)logKey, logEdit));
  }
}
 

import org.apache.hadoop.hbase.coprocessor.WALCoprocessorEnvironment; //导入依赖的package包/类
@Override
public boolean preWALWrite(ObserverContext<WALCoprocessorEnvironment> ctx, HRegionInfo info,
    HLogKey logKey, WALEdit logEdit) throws IOException {
  String r = info.getRegionNameAsString();
  LOG.info("preWALWrite triggered for " + r + ". counters: " + counters);
  return false;
}
 

import org.apache.hadoop.hbase.coprocessor.WALCoprocessorEnvironment; //导入依赖的package包/类
@Override
public void postWALWrite(ObserverContext<WALCoprocessorEnvironment> ctx, HRegionInfo info,
    HLogKey logKey, WALEdit logEdit) throws IOException {
  String r = info.getRegionNameAsString();
  counters.addAndGet(r, 1);
  LOG.info("postWALWrite triggered for " + r + ". counters: " + counters);
}
 

import org.apache.hadoop.hbase.coprocessor.WALCoprocessorEnvironment; //导入依赖的package包/类
@Override
public boolean preWALWrite(ObserverContext<WALCoprocessorEnvironment> ctx, HRegionInfo info,
    HLogKey logKey, WALEdit logEdit) throws IOException {
  String tableNameStr = info.getTableNameAsString();
  if (IndexUtils.isCatalogTable(info.getTableName()) || IndexUtils.isIndexTable(tableNameStr)) {
    return true;
  }
  List<IndexSpecification> indices = indexManager.getIndicesForTable(tableNameStr);
  if (indices != null && !indices.isEmpty()) {
    LOG.trace("Entering preWALWrite for the table " + tableNameStr);
    String indexTableName = IndexUtils.getIndexTableName(tableNameStr);
    IndexEdits iEdits = IndexRegionObserver.threadLocal.get();
    WALEdit indexWALEdit = iEdits.getWALEdit();
    // This size will be 0 when none of the Mutations to the user table to be indexed.
    // or write to WAL is disabled for the Mutations
    if (indexWALEdit.getKeyValues().size() == 0) {
      return true;
    }
    LOG.trace("Adding indexWALEdits into WAL for table " + tableNameStr);
    HRegion indexRegion = iEdits.getRegion();
    // TS in all KVs within WALEdit will be the same. So considering the 1st one.
    Long time = indexWALEdit.getKeyValues().get(0).getTimestamp();
    ctx.getEnvironment()
        .getWAL()
        .appendNoSync(indexRegion.getRegionInfo(), Bytes.toBytes(indexTableName), indexWALEdit,
          logKey.getClusterId(), time, indexRegion.getTableDesc());
    LOG.trace("Exiting preWALWrite for the table " + tableNameStr);
  }
  return true;
}
 

import org.apache.hadoop.hbase.coprocessor.WALCoprocessorEnvironment; //导入依赖的package包/类
@Override
public void postWALWrite(ObserverContext<WALCoprocessorEnvironment> ctx, HRegionInfo info,
    HLogKey logKey, WALEdit logEdit) throws IOException {
}