StackOverflow2013

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2013-10-16T04:54:59.123
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2013-10-16T13:23:12.337
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2013-10-16T13:23:12.337
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text
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Points of interest: <ul> <li>RandomAccessFileAppenders are always buffered. As of beta-9, the buffer size is 256 * 1024 bytes and not configurable. This will become configurable in the next release. </li> <li>FileAppenders can be configured with the <code>bufferedIO</code> attribute to be buffered or not. As of beta-9, the buffer size is 8 * 1024 bytes and not configurable. This will become configurable in the next release.</li> <li>Under the hood, FileAppenders use a java.io.FileOutputStream, which may be wrapped in a BufferedOutputStream. RandomAccessFileAppenders write to a ByteBuffer which is appended to the end of a RandomAccessFile when the buffer is full or <code>flush()</code> is called. There should not be much difference (apart from the performance) but FileAppenders have a longer track record and there may still be issues with the newer RandomAccessFileAppenders that haven't been discovered yet. Roll-over seems to work fine for both types of appender, but there may be corner cases that the team doesn't yet know about. (Log4J2 is under active development though and any issues will be addressed rapidly.)</li> <li>Both RandomAccessFileAppenders and FileAppenders can be configured with the <code>immediateFlush</code> attribute to flush every log event to disk. I recommend you switch off <code>immediateFlush</code> when using AsyncAppenders or AsyncLoggers so you can leverage the nice batching behaviour they provide: the async appenders and loggers can flush after logging multiple events and will also definitely flush once when the queue is empty again, which is very efficient and at the same time ensures that all log events are always persisted to disk.</li> </ul>
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1. POWhen to use Random Access File Appenders vs. Buffered File Appenders in log4j configuration
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1. PTAnswer
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1. USRemko Popma
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1. USRemko Popma
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1. POWhen to use Random Access File Appenders vs. Buffered File Appenders in log4j configuration
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