How do you query hbase

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Showing results for. Search instead for. Did you mean:. Solved Go to solution. Hbase query best practice. Labels: Labels: Apache HBase. Reply 6, Views. The fuzzyKeysData specifies the mentioned significance of a row key byte, by taking one of two values:. Example: Partial Row Key Matching A possible example is matching partial keys, but not from left to right, rather somewhere inside a compound key. The application now requests all users that performed certain action encoded as 99 in January of any year.

Then the pair for row key and fuzzy data would be the following:. An advantage of this filter is that it can likely compute the next matching row key when it comes to an end of a matching one. It implements the getNextCellHint method to help the servers in fast-forwarding to the next range of rows that might match. This speeds up scanning, especially when the skipped ranges are quite large. Example uses the filter to grab specific rows from a test data set.

The test code wiring adds 20 rows to the table, named row to row We want to retrieve all the rows that match the pattern row-? The output above confirms the correct result. Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Collectives on Stack Overflow. Learn more. Querying Hbase efficiently Ask Question. Asked 5 years, 4 months ago. Active 3 years, 11 months ago.

Viewed 4k times. I'm using Java as a client for querying Hbase. Is there a more efficient way of going about this? Thanks a lot for any help in advance! The following example shows how to use the get command. Let us scan the first row of the emp table. To read data from an HBase table, use the get method of the HTable class. This method requires an instance of the Get class. Follow the steps given below to retrieve data from the HBase table.

Configuration class adds HBase configuration files to its object. You can create a configuration object using the create method of the HbaseConfiguration class as shown below. Copy and paste the following put commands on the line below the cat command. Start Drill and complete the following steps to query the HBase tables you created.

The query returns results that are not useable. In the next step, you convert the data from byte arrays to UTF8 types that are meaningful.

Use dot notation to drill down to a column in an HBase table: tablename. Query the clicks table to get the studentid of the student having items. The trivial example in the previous section queried little endian-encoded data in HBase.