zipkin2.storage

Class InMemoryStorage.Builder

java.lang.Object

zipkin2.storage.StorageComponent.Builder

zipkin2.storage.InMemoryStorage.Builder

Enclosing class:

InMemoryStorage

public static final class InMemoryStorage.Builder
extends StorageComponent.Builder

Constructor Summary

Constructors

Constructor and Description
Builder()

Method Summary

Modifier and Type	Method and Description
InMemoryStorage	build()
InMemoryStorage.Builder	maxSpanCount(int maxSpanCount) Eldest traces are removed to ensure spans in memory don't exceed this value
InMemoryStorage.Builder	searchEnabled(boolean searchEnabled) False is an attempt to disable indexing, leaving only SpanStore.getTrace(String) supported.
InMemoryStorage.Builder	strictTraceId(boolean strictTraceId) Zipkin supports 64 and 128-bit trace identifiers, typically serialized as 16 or 32 character hex strings.

Methods inherited from class java.lang.Object

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

Constructor Detail

Builder

public Builder()

Method Detail

strictTraceId

public InMemoryStorage.Builder strictTraceId(boolean strictTraceId)

Zipkin supports 64 and 128-bit trace identifiers, typically serialized as 16 or 32 character hex strings. When false, this setting only considers the low 64-bits (right-most 16 characters) of a trace ID when grouping or retrieving traces. This should be set to false while some applications issue 128-bit trace IDs and while other truncate them to 64-bit. If 128-bit trace IDs are not in use, this setting is not required.

Details

Zipkin historically had 64-bit trace IDs, but it now supports 128-bit trace IDs via 32-character hex representation. While instrumentation update to propagate 128-bit IDs, it can be ambiguous whether a 64-bit trace ID was sent intentionally, or as an accident of truncation. This setting allows Zipkin to be usable until application instrumentation are upgraded to support 128-bit trace IDs.

Here are a few trace IDs the help explain this setting.

   
Trace ID A: 463ac35c9f6413ad48485a3953bb6124
   
Trace ID B: 48485a3953bb6124
   
Trace ID C: 463ac35c9f6413adf1a48a8cff464e0e
   
Trace ID D: 463ac35c9f6413ad
 

In the above example, Trace ID A and Trace ID B might mean they are in the same trace, since the lower-64 bits of the IDs are the same. This could happen if a server A created the trace and propagated it to server B which ran an older tracing library. Server B could have truncated the trace ID to lower-64 bits. When strictTraceId == false, spans matching either trace ID A or B would be returned in the same trace when searching by ID A or B. Spans with trace ID C or D wouldn't be when searching by ID A or B because trace IDs C and D don't share lower 64-bits (right-most 16 characters) with trace IDs A or B.

It is also possible that all servers are capable of handling 128-bit trace identifiers, but are configured to only send 64-bit ones. In this case, if strictTraceId == false trace ID A and B would clash and be put into the same trace, causing confusion. Moreover, there is overhead associated with indexing spans both by 64 and 128-bit trace IDs. When a site has finished upgrading to 128-bit trace IDs, they should enable this setting.

See https://github.com/openzipkin/b3-propagation/issues/6 for the status of known open source libraries on 128-bit trace identifiers.

Specified by:

strictTraceId in class StorageComponent.Builder

searchEnabled

public InMemoryStorage.Builder searchEnabled(boolean searchEnabled)

Description copied from class: StorageComponent.Builder

False is an attempt to disable indexing, leaving only SpanStore.getTrace(String) supported. For example, query requests will be disabled. The use case is typically to support 100% sampled data, or when traces are searched using alternative means such as a logging index.

Refer to implementation docs for the impact of this parameter. Operations that use indexes should return empty as opposed to throwing an exception.

Specified by:

searchEnabled in class StorageComponent.Builder

maxSpanCount

public InMemoryStorage.Builder maxSpanCount(int maxSpanCount)

Eldest traces are removed to ensure spans in memory don't exceed this value

build

public InMemoryStorage build()

Specified by:

build in class StorageComponent.Builder