Question

我从以下来源创建了以下简单表：https://hortonworks.com/hadoop-tutorial/introduction-apache-hbase-concepts-apache-phoenix-new-backup-restore-utility-hbase/#start-hbase

使用以下内容：

create 'driver_dangerous_event','events'
put 'driver_dangerous_event','4','events:driverId','78'
put 'driver_dangerous_event','4','events:driverName','Carl'
put 'driver_dangerous_event','4','events:eventTime','2016-09-23 03:25:03.567'
put 'driver_dangerous_event','4','events:eventType','Normal'
put 'driver_dangerous_event','4','events:latitudeColumn','37.484938'
put 'driver_dangerous_event','4','events:longitudeColumn','-119.966284'
put 'driver_dangerous_event','4','events:routeId','845'
put 'driver_dangerous_event','4','events:routeName','Santa Clara to San Diego'
put 'driver_dangerous_event','4','events:truckId','637'

我需要查询这一行但是使用where过滤器（以备将来使用），我的服务器上运行了一个rest api或thrift api。

我尝试使用rest api但未能做到，是否可能？

我也试过使用这个nuget：https://hbasenet.codeplex.com/releases/view/133288但我无法理解如何使用where子句过滤数据，我只能选择一个特定的行：

Hbase.Client c = new Hbase.Client(serverHostName, port, 10000);
var res = c.Scan<Driver>("driver_dangerous_event", "events", "1");

有没有选项可以使用REST api / Thrift API /其他一些C＃库进行简单的过滤查询？

Answer 1

我使用Microsoft.HBase.Client来预先形成一个简单的查询（https://github.com/hdinsight/hbase-sdk-for-net）

// Connection
RequestOptions scanOptions = RequestOptions.GetDefaultOptions();
scanOptions.Port = int.Parse(hbaseDataConnection.Port);
scanOptions.AlternativeEndpoint = "/";
var nodeIPs = new List<string>();
nodeIPs.Add(hbaseDataConnection.Address);
HBaseClient client = new HBaseClient(null, scanOptions, new LoadBalancerRoundRobin(nodeIPs));
Scanner scanner = new Scanner { batch = 10 };
ScannerInformation scannerInfo = await client.CreateScannerAsync(_tableName, scanner, scanOptions);
var options = RequestOptions.GetDefaultOptions();
options.Port = int.Parse(hbaseDataConnection.Port);
options.AlternativeEndpoint = "/";
options.AlternativeHost = scannerInfo.Location.Host;

var f1 = new SingleColumnValueFilter(
Encoding.UTF8.GetBytes(ColumnFamilyName),
Encoding.UTF8.GetBytes("driverName"),
CompareFilter.CompareOp.Equal,
new SubstringComparator(fld.Values[0].ToString()))

var filter = new FilterList(FilterList.Operator.MustPassAll, f1);
scanner.filter = filter.ToEncodedString();

ScannerInformation scanInfo = client.CreateScannerAsync(_tableName, scanner, scanOptions).Result;
result = RetrieveResults(client, scanInfo, scanOptions).ToList();

确保在HBase计算机上运行REST API，例如

hbase rest start -p 20050 --infoport 20051

如何使用条件（Where子句）从HBase中执行简单的选择

1 个答案: