Package org.apache.hadoop.hbase.client.metrics

Class ScanMetrics

java.lang.Object

org.apache.hadoop.hbase.client.metrics.ServerSideScanMetrics

org.apache.hadoop.hbase.client.metrics.ScanMetrics

@Public
public class ScanMetrics
extends ServerSideScanMetrics

Provides metrics related to scan operations (both server side and client side metrics).

The data can be passed to mapreduce framework or other systems. We use atomic longs so that one thread can increment, while another atomically resets to zero after the values are reported to hadoop's counters.

Some of these metrics are general for any client operation such as put However, there is no need for this. So they are defined under scan operation for now.

Field Summary

Fields

Modifier and Type	Field	Description
static final String	BYTES_IN_REMOTE_RESULTS_METRIC_NAME
static final String	BYTES_IN_RESULTS_METRIC_NAME
final AtomicLong	countOfBytesInRemoteResults	number of bytes in Result objects from remote region servers
final AtomicLong	countOfBytesInResults	number of bytes in Result objects from region servers
final AtomicLong	countOfNSRE	number of NotServingRegionException caught
final AtomicLong	countOfRegions	number of regions
final AtomicLong	countOfRemoteRPCcalls	number of remote RPC calls
final AtomicLong	countOfRemoteRPCRetries	number of remote RPC retries
final AtomicLong	countOfRPCcalls	number of RPC calls
final AtomicLong	countOfRPCRetries	number of RPC retries
static final String	MILLIS_BETWEEN_NEXTS_METRIC_NAME
static final String	NOT_SERVING_REGION_EXCEPTION_METRIC_NAME
static final String	REGIONS_SCANNED_METRIC_NAME
static final String	REMOTE_RPC_CALLS_METRIC_NAME
static final String	REMOTE_RPC_RETRIES_METRIC_NAME
static final String	RPC_CALLS_METRIC_NAME
static final String	RPC_RETRIES_METRIC_NAME
final AtomicLong	sumOfMillisSecBetweenNexts	sum of milliseconds between sequential next calls

Fields inherited from class org.apache.hadoop.hbase.client.metrics.ServerSideScanMetrics

BLOCK_BYTES_SCANNED_KEY_METRIC_NAME, COUNT_OF_ROWS_FILTERED_KEY_METRIC_NAME, COUNT_OF_ROWS_SCANNED_KEY_METRIC_NAME, countOfBlockBytesScanned, countOfRowsFiltered, countOfRowsScanned, FS_READ_TIME_METRIC_NAME, fsReadTime

Constructor Summary

Constructors

Constructor	Description
ScanMetrics()	constructor

Method Summary

Methods inherited from class org.apache.hadoop.hbase.client.metrics.ServerSideScanMetrics

addToCounter, createCounter, getCounter, getMetricsMap, getMetricsMap, hasCounter, setCounter

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Details

RPC_CALLS_METRIC_NAME

public static final String RPC_CALLS_METRIC_NAME

See Also:

• Constant Field Values

REMOTE_RPC_CALLS_METRIC_NAME

public static final String REMOTE_RPC_CALLS_METRIC_NAME

See Also:

• Constant Field Values

MILLIS_BETWEEN_NEXTS_METRIC_NAME

public static final String MILLIS_BETWEEN_NEXTS_METRIC_NAME

See Also:

• Constant Field Values

NOT_SERVING_REGION_EXCEPTION_METRIC_NAME

public static final String NOT_SERVING_REGION_EXCEPTION_METRIC_NAME

See Also:

• Constant Field Values

BYTES_IN_RESULTS_METRIC_NAME

public static final String BYTES_IN_RESULTS_METRIC_NAME

See Also:

• Constant Field Values

BYTES_IN_REMOTE_RESULTS_METRIC_NAME

public static final String BYTES_IN_REMOTE_RESULTS_METRIC_NAME

See Also:

• Constant Field Values

REGIONS_SCANNED_METRIC_NAME

public static final String REGIONS_SCANNED_METRIC_NAME

See Also:

• Constant Field Values

RPC_RETRIES_METRIC_NAME

public static final String RPC_RETRIES_METRIC_NAME

See Also:

• Constant Field Values

REMOTE_RPC_RETRIES_METRIC_NAME

public static final String REMOTE_RPC_RETRIES_METRIC_NAME

See Also:

• Constant Field Values

countOfRPCcalls

public final AtomicLong countOfRPCcalls

number of RPC calls

countOfRemoteRPCcalls

public final AtomicLong countOfRemoteRPCcalls

number of remote RPC calls

sumOfMillisSecBetweenNexts

public final AtomicLong sumOfMillisSecBetweenNexts

sum of milliseconds between sequential next calls

countOfNSRE

public final AtomicLong countOfNSRE

number of NotServingRegionException caught

countOfBytesInResults

public final AtomicLong countOfBytesInResults

number of bytes in Result objects from region servers

countOfBytesInRemoteResults

public final AtomicLong countOfBytesInRemoteResults

number of bytes in Result objects from remote region servers

countOfRegions

public final AtomicLong countOfRegions

number of regions

countOfRPCRetries

public final AtomicLong countOfRPCRetries

number of RPC retries

countOfRemoteRPCRetries

public final AtomicLong countOfRemoteRPCRetries

number of remote RPC retries

Constructor Details

ScanMetrics

public ScanMetrics()

constructor