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HBASE-18718 Document the coprocessor.Export

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Chia-Ping Tsai 2017-09-09 15:16:14 +08:00
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src/main/asciidoc/_chapters/ops_mgt.adoc
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@ -444,12 +444,56 @@ See Jonathan Hsieh's link:https://blog.cloudera.com/blog/2012/06/online-hbase-ba
=== Export === Export
Export is a utility that will dump the contents of table to HDFS in a sequence file. Export is a utility that will dump the contents of table to HDFS in a sequence file.
Invoke via: The Export can be run via a Coprocessor Endpoint or MapReduce. Invoke via:
*mapreduce-based Export*
---- ----
$ bin/hbase org.apache.hadoop.hbase.mapreduce.Export <tablename> <outputdir> [<versions> [<starttime> [<endtime>]]] $ bin/hbase org.apache.hadoop.hbase.mapreduce.Export <tablename> <outputdir> [<versions> [<starttime> [<endtime>]]]
---- ----
*endpoint-based Export*
----
$ bin/hbase org.apache.hadoop.hbase.coprocessor.Export <tablename> <outputdir> [<versions> [<starttime> [<endtime>]]]
----
*The Comparison of Endpoint-based Export And Mapreduce-based Export*
|===
||Endpoint-based Export|Mapreduce-based Export
|HBase version requirement
|2.0+
|0.2.1+
|Maven dependency
|hbase-endpoint
|hbase-mapreduce (2.0+), hbase-server(prior to 2.0)
|Requirement before dump
|mount the endpoint.Export on the target table
|deploy the MapReduce framework
|Read latency
|low, directly read the data from region
|normal, traditional RPC scan
|Read Scalability
|depend on number of regions
|depend on number of mappers (see TableInputFormatBase#getSplits)
|Timeout
|operation timeout. configured by hbase.client.operation.timeout
|scan timeout. configured by hbase.client.scanner.timeout.period
|Permission requirement
|READ, EXECUTE
|READ
|Fault tolerance
|no
|depend on MapReduce
|===
NOTE: To see usage instructions, run the command with no options. Available options include NOTE: To see usage instructions, run the command with no options. Available options include
specifying column families and applying filters during the export. specifying column families and applying filters during the export.