HBase数据导入-Bulkload问题

使用bulkload导入，执行以下命令

hbase org.apache.hadoop.hbase.mapreduce.LoadIncrementalHFiles /user/pingz/data/$logDate $tableName

最终执行速度特别慢，300G数据需要半个小时左右，原因是生成的hfile数据没有直接move，而是采用了copy的方式，主要跟集群是federation方式有关。

具体 参照强哥提交的issues https://issues.apache.org/jira/browse/HBASE-17429?jql=project%20%3D%20HBASE%20AND%20text%20~%20viewfs

最终调用的是HRegionFileSystem的bulkLoadStoreFile方法

Path bulkLoadStoreFile(final String familyName, Path srcPath, long seqNum)
      throws IOException {
    // Copy the file if it's on another filesystem
    FileSystem srcFs = srcPath.getFileSystem(conf);
    FileSystem desFs = fs instanceof HFileSystem ? ((HFileSystem)fs).getBackingFs() : fs;

    // We can't compare FileSystem instances as equals() includes UGI instance
    // as part of the comparison and won't work when doing SecureBulkLoad
    // TODO deal with viewFS
    if (!FSHDFSUtils.isSameHdfs(conf, srcFs, desFs)) {
      LOG.info("Bulk-load file " + srcPath + " is on different filesystem than " +
          "the destination store. Copying file over to destination filesystem.");
      Path tmpPath = createTempName();
      FileUtil.copy(srcFs, srcPath, fs, tmpPath, false, conf);
      LOG.info("Copied " + srcPath + " to temporary path on destination filesystem: " + tmpPath);
      srcPath = tmpPath;
    }
return commitStoreFile(familyName, srcPath, seqNum, true);
  }

数据生成的结果目录是放在/user目录下，该目录挂载到XXNameNode2，而HBase目录是挂载到XXNameNode，

具体解决办法一个是升级HBase或者打一个patch，或者是新建一个目录，挂载到和HBase同一个namespace下

    <property>
       <name>fs.viewfs.mounttable.XX.link./user</name>
       <value>hdfs://XXNameNode2:8020/user</value>
    </property>

    <property>
       <name>fs.viewfs.mounttable.XX.link./hbase</name>
       <value>hdfs://XXNameNode:8020/hbase</value>
    </property>

    <property>
       <name>fs.viewfs.mounttable.XX.link./bulkload</name>
       <value>hdfs://XXNameNode:8020/bulkload</value>
    </property>

同时修改脚本

hbase org.apache.hadoop.hbase.mapreduce.LoadIncrementalHFiles hdfs://XXNameNode:8020/bulkload/appdata/$logDate $tableName

参考1