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| author | Rainer Gerhards <rgerhards@adiscon.com> | 2011-07-13 12:54:08 +0200 |
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| committer | Rainer Gerhards <rgerhards@adiscon.com> | 2011-07-13 12:54:08 +0200 |
| commit | 742afce7458505be1a82792c9b5728f58456565d (patch) | |
| tree | 1784391b6b7948c208e52ee0ca6f5c504463a268 /doc/v6compatibility.html | |
| parent | 9b7107111dac2a3d836063e576e465e5f3b791db (diff) | |
| download | rsyslog-742afce7458505be1a82792c9b5728f58456565d.tar.gz rsyslog-742afce7458505be1a82792c9b5728f58456565d.tar.xz rsyslog-742afce7458505be1a82792c9b5728f58456565d.zip | |
lexer bug: *.somewhat PRIs not detected
regression from last update
Diffstat (limited to 'doc/v6compatibility.html')
| -rw-r--r-- | doc/v6compatibility.html | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/doc/v6compatibility.html b/doc/v6compatibility.html new file mode 100644 index 00000000..6d60062f --- /dev/null +++ b/doc/v6compatibility.html @@ -0,0 +1,30 @@ +<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> +<html><head><title>Compatibility notes for rsyslog v5</title> +</head> +<body> +<h1>Compatibility Notes for rsyslog v5</h1> +<p><small><i>Written by <a href="http://www.gerhards.net/rainer">Rainer Gerhards</a> +(2009-07-15)</i></small></p> +<p>The changes introduced in rsyslog v5 are numerous, but not very intrusive. +This document describes things to keep in mind when moving from v4 to v5. It +does not list enhancements nor does it talk about compatibility concerns introduced +by earlier versions (for this, see their respective compatibility documents). +<h2>HUP processing</h2> +<p>The $HUPisRestart directive is supported by some early v5 versions, but has been removed +in 5.1.3 and above. That means that restart-type HUP processing is no longer +available. This processing was redundant and had a lot a drawbacks. +For details, please see the +<a href="v4compatibility.html">rsyslog v4 compatibility notes</a> which elaborate +on the reasons and the (few) things you may need to change. +<h2>Queue Worker Thread Shutdown</h2> +<p>Previous rsyslog versions had the capability to "run" on zero queue worker +if no work was required. This was done to save a very limited number of resources. However, +it came at the price of great complexity. In v5, we have decided to let a minium of one +worker run all the time. The additional resource consumption is probably not noticable at +all, however, this enabled us to do some important code cleanups, resulting in faster +and more reliable code (complex code is hard to maintain and error-prone). From the +regular user's point of view, this change should be barely noticable. I am including the +note for expert users, who will notice it in rsyslog debug output and other analysis tools. +So it is no error if each queue in non-direct mode now always runs at least one worker +thread. +</body></html> |