Tag: hbase

Quickly executing multiple hbase commands from shell

We tend to setup our hbase test tables by shell scripts. Hence we have to execute multiple puts and deletes in a row. When you add an hbase shell [command] for each single operation you will have to wait a long time until all commands are processed. A more performant proceeding is to put all commands in one single <<EOF … EOF construct which basically allows to pass a multi line parameter to the shell.

hbase shell <<EOF
put 'shared:ITEMS','item0001','c:value','1.0'
put 'shared:ITEMS','item0002','c:value','2.0'
put 'shared:ITEMS','item0003','c:value','3.0'
put 'shared:ITEMS','item0004','c:value','4.0'
put 'shared:ITEMS','item0005','c:value','5.0'
put 'shared:ITEMS','item0006','c:value','6.0'
EOF

Doing so hbase will only start one shell instead of starting an instance for each single command.

Java client for the hbase REST API

Modern open source projects frequently lack documentation and so does hbase regarding its REST API. Even though REST is covered in the official hbase reference book the guidelines are not complete as I’ll show in the listings below. A second source that you might have come across is a set of three blog posts by Cloudera which is quite good and much more detailled than the official hbase guidelines – but it still does not fully cover then traps you might run into when implementing a java client.

I’d like to show three examples, two for a put and one for a get request. All further operations like delete or post should then be easy to implement once you know how to send requests to the REST server.

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