[[breaking_50_packaging]]
=== Packaging

==== Default logging using systemd (since Elasticsearch 2.2.0)

In previous versions of Elasticsearch, the default logging
configuration routed standard output to /dev/null and standard error to
the journal. However, there are often critical error messages at
startup that are logged to standard output rather than standard error
and these error messages would be lost to the nether. The default has
changed to now route standard output to the journal and standard error
to inherit this setting (these are the defaults for systemd). These
settings can be modified by editing the elasticsearch.service file.

==== Longer startup times

In Elasticsearch 5.0.0 the `-XX:+AlwaysPreTouch` flag has been added to the JVM
startup options. This option touches all memory pages used by the JVM heap
during initialization of the HotSpot VM to reduce the chance of having to commit
a memory page during GC time. This will increase the startup time of
Elasticsearch as well as increasing the initial resident memory usage of the
Java process.