Package org.apache.storm.metricstore.rocksdb

Class RocksDbKey

java.lang.Object

org.apache.storm.metricstore.rocksdb.RocksDbKey

All Implemented Interfaces:

Comparable<RocksDbKey>

public class RocksDbKey
extends Object
implements Comparable<RocksDbKey>

Class representing the data used as a Key in RocksDB. Keys can be used either for metadata or metrics.

Keys are 38 bytes in size. The fields for a key are:

<
 Field             Size         Offset

 Type                 1              0      The type maps to the KeyType enum, specifying a metric or various types of metadata
 Aggregation Level    1              1      The aggregation level for a metric (see AggLevel enum).  0 for metadata.
 TopologyId           4              2      The metadata string Id representing a topologyId for a metric, or the unique
                                                   string Id for a metadata string
 Timestamp            8              6      The timestamp for a metric, unused for metadata
 MetricId             4             14      The metadata string Id for the metric name
 ComponentId          4             18      The metadata string Id for the component Id
 ExecutorId           4             22      The metadata string Id for the executor Id
 HostId               4             26      The metadata string Id for the host Id
 Port                 4             30      The port number
 StreamId             4             34      The metadata string Id for the stream Id
 

Method Summary

Modifier and Type	Method	Description
int	compareTo(RocksDbKey o)	compares to keys on a byte by byte basis.
String	toString()

Methods inherited from class java.lang.Object

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

Method Details

compareTo

public int compareTo(RocksDbKey o)

compares to keys on a byte by byte basis.

Specified by:

compareTo in interface Comparable<RocksDbKey>

Returns:

comparison of key byte values

toString

public String toString()

Overrides:

toString in class Object