Help Center > > User Guide> MRS Cluster Component Operation Guide> Using HBase> Using HIndex> Loading Index Data in Batches

Loading Index Data in Batches

Updated at:Nov 06, 2019 GMT+08:00

Scenario

HBase provides the ImportTsv&LoadIncremental tool to load user data in batches. Currently, the HIndexImportTsv is provided to load user data and load index data in batches. HIndexImportTsv inherits all functions of the HBase batch data loading tool ImportTsv. If a table is not created before the HIndexImportTsv tool is executed, an index will be created when the table is created, and index data is generated when user data is generated.

Procedure

  1. Run the following commands to import data to HDFS:

    hdfs dfs -mkdir <inputdir>

    hdfs dfs -put <local_data_file> <inputdir>

    For example, define the data file data.txt as follows:

    12005000201,Zhang San,Male,19,Shenzhen City, Guangdong Province
    12005000202,Li Wanting,Female,23,Hangzhou City, Zhejiang Province
    12005000203,Wang Ming,Male,26,Ningbo City, Zhejiang Province
    12005000204,Li Gang,Male,18,Xiangyang City, Hubei Province
    12005000205,Zhao Enru,Female,21,Shangrao City, Jiangxi Province
    12005000206,Chen Long,Male,32,Zhuzhou City, Hunan Province
    12005000207,Zhou Wei,Female,29,Nanyang City, Henan Province
    12005000208,Yang Yiwen,Female,30,Wenzhou City, Zhejiang Province
    12005000209,Xu Bing,Male,26,Weinan City, Shanxi Province
    12005000210,Xiao Kai,Male,25,Dalian City, Liaoning Province

    Run the following commands:

    hdfs dfs -mkdir /datadirImport

    hdfs dfs -put data.txt /datadirImport

  2. Run the following command to create the bulkTable table:

    create 'bulkTable', {NAME => 'info',COMPRESSION => 'SNAPPY', DATA_BLOCK_ENCODING => 'FAST_DIFF'},{NAME=>'address'}

  3. Run the following command to generate an HFile file (StoreFiles):

    hbase org.apache.hadoop.hbase.hindex.mapreduce.HIndexImportTsv -Dimporttsv.separator=<separator>

    -Dimporttsv.bulk.output=</path/for/output> -Dindexspecs.to.add=<indexspecs> -Dimporttsv.columns=<columns> tableName <inputdir>

    • -Dimport.separator: Indicates a separator, for example, -Dimport.separator=','.
    • -Dimport.bulk.output=</path/for/output>: Indicates an output path of the execution result. You need to specify a path that does not exist.
    • <columns>: Indicates the mapping of the imported data in a table, for example, -Dimporttsv.columns=HBASE_ROW_KEY,info:name,info:gender,info:age,address:city,address:province.
    • <tablename>: Indicates the name of a table to be operated.
    • <inputdir>: Indicates the directory where data is loaded in batches.
    • -Dindexspecs.to.add=<indexspecs>: Indicates the mapping between an index name and a column, for example, -Dindexspecs.to.add='index_bulk=>info:[age->String]'. The index composition can be represented as follows:

      indexNameN=>familyN :[columnQualifierN-> columnQualifierDataType], [columnQualifierM-> columnQualifierDataType];familyM: [columnQualifierO-> columnQualifierDataType]# indexNameN=> familyM: [columnQualifierO-> columnQualifierDataType]

      Column qualifiers are separated by commas (,).

      Example: "index1 => f1:[c1-> String],[c2-> String]"

      Column families are separated by semicolons (;).

      Example: "index1 => f1:[c1-> String],[c2-> String]; f2:[c3-> Long]"

      Multiple indexes are separated by pound keys (#).

      Example: "index1 => f1:[c1-> String],[c2-> String]; f2:[c3-> Long]#index2 => f2:[c3-> Long]"

      The following data types are supported by columns.

      Available data types are as follows: STRING, INTEGER, FLOAT, LONG, DOUBLE, SHORT, BYTE, CHAR

      Data types can be transferred in lowercase.

    For example, run the following command:

    hbase org.apache.hadoop.hbase.hindex.mapreduce.HIndexImportTsv -Dimporttsv.separator=',' -Dimporttsv.bulk.output=/dataOutput -Dindexspecs.to.add='index_bulk=>info:[age->String]' -Dimporttsv.columns=HBASE_ROW_KEY,info:name,info:gender,info:age,address:city,address:province bulkTable /datadirImport/data.txt

    Command output:

    [root@shap000000406 opt]# hbase org.apache.hadoop.hbase.hindex.mapreduce.HIndexImportTsv -Dimporttsv.separator=',' -Dimporttsv.bulk.output=/dataOutput -Dindexspecs.to.add='index_bulk=>info:[age->String]' -Dimporttsv.columns=HBASE_ROW_KEY,info:name,info:gender,info:age,address:city,address:province bulkTable /datadirImport/data.txt
    2018-05-08 21:29:16,059 INFO  [main] mapreduce.HFileOutputFormat2: Incremental table bulkTable output configured.
    2018-05-08 21:29:16,069 INFO  [main] client.ConnectionManager$HConnectionImplementation: Closing master protocol: MasterService
    2018-05-08 21:29:16,069 INFO  [main] client.ConnectionManager$HConnectionImplementation: Closing zookeeper sessionid=0x80007c2cb4fd5b4d
    2018-05-08 21:29:16,072 INFO  [main] zookeeper.ZooKeeper: Session: 0x80007c2cb4fd5b4d closed
    2018-05-08 21:29:16,072 INFO  [main-EventThread] zookeeper.ClientCnxn: EventThread shut down for session: 0x80007c2cb4fd5b4d
    2018-05-08 21:29:16,379 INFO  [main] client.ConfiguredRMFailoverProxyProvider: Failing over to 147
    2018-05-08 21:29:17,328 INFO  [main] input.FileInputFormat: Total input files to process : 1
    2018-05-08 21:29:17,413 INFO  [main] mapreduce.JobSubmitter: number of splits:1
    2018-05-08 21:29:17,430 INFO  [main] Configuration.deprecation: io.bytes.per.checksum is deprecated. Instead, use dfs.bytes-per-checksum
    2018-05-08 21:29:17,687 INFO  [main] mapreduce.JobSubmitter: Submitting tokens for job: job_1525338489458_0002
    2018-05-08 21:29:18,100 INFO  [main] impl.YarnClientImpl: Submitted application application_1525338489458_0002
    2018-05-08 21:29:18,136 INFO  [main] mapreduce.Job: The url to track the job: http://shap000000407:8088/proxy/application_1525338489458_0002/
    2018-05-08 21:29:18,136 INFO  [main] mapreduce.Job: Running job: job_1525338489458_0002
    2018-05-08 21:29:28,248 INFO  [main] mapreduce.Job: Job job_1525338489458_0002 running in uber mode : false
    2018-05-08 21:29:28,249 INFO  [main] mapreduce.Job:  map 0% reduce 0%
    2018-05-08 21:29:38,344 INFO  [main] mapreduce.Job:  map 100% reduce 0%
    2018-05-08 21:29:51,421 INFO  [main] mapreduce.Job:  map 100% reduce 100%
    2018-05-08 21:29:51,428 INFO  [main] mapreduce.Job: Job job_1525338489458_0002 completed successfully
    2018-05-08 21:29:51,523 INFO  [main] mapreduce.Job: Counters: 50
  4. Run the following command to import the generated HFile to HBase:

    hbase org.apache.hadoop.hbase.mapreduce.LoadIncrementalHFiles </path/for/output> <tablename>

    For example, run the following command:

    hbase org.apache.hadoop.hbase.mapreduce.LoadIncrementalHFiles /dataOutput bulkTable

    Command output:

    [root@shap000000406 opt]# hbase org.apache.hadoop.hbase.mapreduce.LoadIncrementalHFiles /dataOutput bulkTable
    2018-05-08 21:30:01,398 WARN  [main] mapreduce.LoadIncrementalHFiles: Skipping non-directory hdfs://hacluster/dataOutput/_SUCCESS
    2018-05-08 21:30:02,006 INFO  [LoadIncrementalHFiles-0] hfile.CacheConfig: Created cacheConfig: CacheConfig:disabled
    2018-05-08 21:30:02,006 INFO  [LoadIncrementalHFiles-2] hfile.CacheConfig: Created cacheConfig: CacheConfig:disabled
    2018-05-08 21:30:02,006 INFO  [LoadIncrementalHFiles-1] hfile.CacheConfig: Created cacheConfig: CacheConfig:disabled
    2018-05-08 21:30:02,085 INFO  [LoadIncrementalHFiles-2] compress.CodecPool: Got brand-new decompressor [.snappy]
    2018-05-08 21:30:02,120 INFO  [LoadIncrementalHFiles-0] mapreduce.LoadIncrementalHFiles: Trying to load hfile=hdfs://hacluster/dataOutput/address/042426c252f74e859858c7877b95e510 first=12005000201 last=12005000210
    2018-05-08 21:30:02,120 INFO  [LoadIncrementalHFiles-2] mapreduce.LoadIncrementalHFiles: Trying to load hfile=hdfs://hacluster/dataOutput/info/f3995920ae0247a88182f637aa031c49 first=12005000201 last=12005000210
    2018-05-08 21:30:02,128 INFO  [LoadIncrementalHFiles-1] mapreduce.LoadIncrementalHFiles: Trying to load hfile=hdfs://hacluster/dataOutput/d/c53b252248af42779f29442ab84f86b8 first=\x00index_bulk\x00\x00\x00\x00\x00\x00\x00\x0018\x00\x0012005000204 last=\x00index_bulk\x00\x00\x00\x00\x00\x00\x00\x0032\x00\x0012005000206
    2018-05-08 21:30:02,231 INFO  [main] client.ConnectionManager$HConnectionImplementation: Closing master protocol: MasterService
    2018-05-08 21:30:02,231 INFO  [main] client.ConnectionManager$HConnectionImplementation: Closing zookeeper sessionid=0x81007c2cf0f55cc5
    2018-05-08 21:30:02,235 INFO  [main] zookeeper.ZooKeeper: Session: 0x81007c2cf0f55cc5 closed
    2018-05-08 21:30:02,235 INFO  [main-EventThread] zookeeper.ClientCnxn: EventThread shut down for session: 0x81007c2cf0f55cc5

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