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https://issues.apache.org/jira/browse/LOG4J2-1305?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15177053#comment-15177053
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Matt Sicker commented on LOG4J2-1305:
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Markers are hierarchical though, that's only a linear representation.
> Binary Layout
> -------------
>
> Key: LOG4J2-1305
> URL: https://issues.apache.org/jira/browse/LOG4J2-1305
> Project: Log4j 2
> Issue Type: New Feature
> Components: Layouts
> Reporter: Remko Popma
>
> Logging in a binary format instead of in text can give large performance
> improvements. Text-based logging formats are supported by layouts like
> PatternLayout, and performance investigations like done in LOG4J2-930 suggest
> that it may be difficult to achieve good performance when logging text.
> Logging text means going from a LogEvent object to formatted text, and then
> converting this text to bytes. A different approach would be to convert the
> LogEvent to a binary representation directly without creating a text
> representation first. This may make fast synchronous logging possible,
> although that would additionally require a lock-free appender (LOG4J2-928).
> This proposes a simple BinaryLayout, where each LogEvent is logged in a
> binary record like this:
> ||Offset||Type||Description||
> |0|long|TimeMillis|
> |8|long|NanoTime|
> |16|int|Level|
> |20|int|Logger name index - string value in separate file|
> |24|int|Thread name index - string value in separate file|
> |28|long|Thread ID|
> |36|short|Marker count|
> |38|int|marker name index - string value in separate file ... (below offset
> assumes only one marker)|
> |42|int|Message length|
> |46|int|Message type|
> |50|byte[]|Message data - below offset assumes 10 bytes of message data|
> |60|int| Throwable data length|
> |64|byte[]|Throwable data - below offset assumes 10 bytes of Throwable data|
> |74|int|ThreadContext key/value pair count|
> |78|int|ThreadContext key index - string value in separate file|
> |82|int|ThreadContext value index - string value in separate file|
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