HBase学习笔记-统计表行数
2017-02-14 12:39
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HBase统计表行数的方式如下:
一、HBase自带MapReduce表行数统计RowCounter
$HBASE_HOME/bin/hbase org.apache.Hadoop.hbase.mapreduce.RowCounter
‘tableName’
二、使用Scan与Filter的方式对表行数进行统计
[java] view
plain copy
public static long rowCount(String tableName) {
long rowCount = 0;
try {
HTable table = new HTable(configuration, tableName);
Scan scan = new Scan();
scan.setFilter(new FirstKeyOnlyFilter());
ResultScanner resultScanner = table.getScanner(scan);
for (Result result : resultScanner) {
rowCount += result.size();
}
} catch (IOException e) {
logger.info(e.getMessage(), e);
}
return rowCount;
}
三、使用Coprocessor新特性来对表行数进行统计
[java] view
plain copy
public static void addTableCoprocessor(String tableName, String coprocessorClassName) {
try {
admin.disableTable(tableName);
HTableDescriptor htd = admin.getTableDescriptor(Bytes.toBytes(tableName));
htd.addCoprocessor(coprocessorClassName);
admin.modifyTable(Bytes.toBytes(tableName), htd);
admin.enableTable(tableName);
} catch (IOException e) {
logger.info(e.getMessage(), e);
}
}
public static long rowCount(String tableName, String family) {
AggregationClient ac = new AggregationClient(configuration);
Scan scan = new Scan();
scan.addFamily(Bytes.toBytes(family));
long rowCount = 0;
try {
rowCount = ac.rowCount(Bytes.toBytes(tableName), new LongColumnInterpreter(), scan);
} catch (Throwable e) {
logger.info(e.getMessage(), e);
}
return rowCount;
}
[java] view
plain copy
@Test
public void testTableRowCount() {
String coprocessorClassName = "org.apache.hadoop.hbase.coprocessor.AggregateImplementation";
HBaseUtils.addTableCoprocessor("user", coprocessorClassName);
long rowCount = HBaseUtils.rowCount("user", "basic");
System.out.println("rowCount: " + rowCount);
}
一、HBase自带MapReduce表行数统计RowCounter
$HBASE_HOME/bin/hbase org.apache.Hadoop.hbase.mapreduce.RowCounter
‘tableName’
二、使用Scan与Filter的方式对表行数进行统计
[java] view
plain copy
public static long rowCount(String tableName) {
long rowCount = 0;
try {
HTable table = new HTable(configuration, tableName);
Scan scan = new Scan();
scan.setFilter(new FirstKeyOnlyFilter());
ResultScanner resultScanner = table.getScanner(scan);
for (Result result : resultScanner) {
rowCount += result.size();
}
} catch (IOException e) {
logger.info(e.getMessage(), e);
}
return rowCount;
}
三、使用Coprocessor新特性来对表行数进行统计
[java] view
plain copy
public static void addTableCoprocessor(String tableName, String coprocessorClassName) {
try {
admin.disableTable(tableName);
HTableDescriptor htd = admin.getTableDescriptor(Bytes.toBytes(tableName));
htd.addCoprocessor(coprocessorClassName);
admin.modifyTable(Bytes.toBytes(tableName), htd);
admin.enableTable(tableName);
} catch (IOException e) {
logger.info(e.getMessage(), e);
}
}
public static long rowCount(String tableName, String family) {
AggregationClient ac = new AggregationClient(configuration);
Scan scan = new Scan();
scan.addFamily(Bytes.toBytes(family));
long rowCount = 0;
try {
rowCount = ac.rowCount(Bytes.toBytes(tableName), new LongColumnInterpreter(), scan);
} catch (Throwable e) {
logger.info(e.getMessage(), e);
}
return rowCount;
}
[java] view
plain copy
@Test
public void testTableRowCount() {
String coprocessorClassName = "org.apache.hadoop.hbase.coprocessor.AggregateImplementation";
HBaseUtils.addTableCoprocessor("user", coprocessorClassName);
long rowCount = HBaseUtils.rowCount("user", "basic");
System.out.println("rowCount: " + rowCount);
}
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