Class RocksDbKey
java.lang.Object
org.apache.storm.metricstore.rocksdb.RocksDbKey
- All Implemented Interfaces:
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
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Method Summary
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Method Details
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compareTo
compares to keys on a byte by byte basis.- Specified by:
compareToin interfaceComparable<RocksDbKey>- Returns:
- comparison of key byte values
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toString
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