FateLegacyJMXMetrics (Apache Accumulo Master Server 1.10.1 API)

java.lang.Object
- org.apache.accumulo.master.metrics.fate.FateLegacyJMXMetrics

All Implemented Interfaces:

FateLegacyJMXMetricsMBean, Metrics
```
public class FateLegacyJMXMetrics
extends Object
implements Metrics, FateLegacyJMXMetricsMBean
```
Basic implementation of fate metrics that publish to JMX when legacy metrics enabled. For logging in addition to JMX, use the hadoop metrics2 implementation. The measurement type and values provided are:
- gauge - current count of FATE transactions in progress
- gauge - last zookeeper id that modified FATE root path to provide estimate of fate transaction liveliness
- counter - the number of zookeeper connection errors since process started.
Implementation notes:
The fate operation estimate is based on zookeeper Stat structure and the property of pzxid. From the zookeeper developer's guide: pzxid is "The zxid of the change that last modified children of this znode." The pzxid should then change each time a FATE transaction is created or deleted - and the zookeeper id (zxid) is expected to continuously increase because the zookeeper id is used by zookeeper for ordering operations.

Field Summary
- Fields inherited from interface org.apache.accumulo.server.metrics.Metrics
  MASTER_NAME, PREFIX, THRIFT_NAME, TSERVER_NAME

Constructor Summary

Constructors
Constructor Description

FateLegacyJMXMetrics(String instanceId, long minimumRefreshDelay)

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`void`	`add(String name, long time)`
`long`	`getCurrentFateOps()`
`long`	`getZKConnectionErrorsTotal()`
`long`	`getZkFateChildOpsTotal()`
`boolean`	`isEnabled()`
`void`	`register()`
`void`	`snapshot()`	Update the metric values from zookeeper after minimumRefreshDelay has expired.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - FateLegacyJMXMetrics
```
public FateLegacyJMXMetrics(String instanceId,
                            long minimumRefreshDelay)
```
- Method Detail
  - register
```
public void register()
              throws Exception
```
    Specified by:
    
    register in interface Metrics
    
    Throws:
    
    Exception
  - add
```
public void add(String name,
                long time)
```
    Specified by:
    
    add in interface Metrics
  - snapshot
```
public void snapshot()
```
    Update the metric values from zookeeper after minimumRefreshDelay has expired.
  - isEnabled
```
public boolean isEnabled()
```
    Specified by:
    
    isEnabled in interface Metrics
  - getCurrentFateOps
```
public long getCurrentFateOps()
```
    Specified by:
    
    getCurrentFateOps in interface FateLegacyJMXMetricsMBean
  - getZkFateChildOpsTotal
```
public long getZkFateChildOpsTotal()
```
    Specified by:
    
    getZkFateChildOpsTotal in interface FateLegacyJMXMetricsMBean
  - getZKConnectionErrorsTotal
```
public long getZKConnectionErrorsTotal()
```
    Specified by:
    
    getZKConnectionErrorsTotal in interface FateLegacyJMXMetricsMBean