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From "Remko Popma (JIRA)" <j...@apache.org>
Subject [jira] [Created] (LOG4J2-1305) Binary Layout
Date Thu, 03 Mar 2016 02:35:18 GMT
Remko Popma created LOG4J2-1305:
-----------------------------------

             Summary: 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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