Improve file.Folder deployment performance
Suppose you are doing a deployment where one of the deployables is a
file.Folder or any type derived from this. As part of the deployment, placeholders will be replaced in each of the files contained in the folder, and then the files are transferred to a temporary directory on the target host before moving them to their final deployment destination.
The legacy way of doing this is by copying each of the files one-by-one. While this works well, it can be slow when there are many files to copy since each file has some connection overhead. As of 9.7, XL Deploy provides additional copy strategies to speed up this proces.
These are the available strategies:
- OneByOne - the default, legacy strategy of copying files one by one
- Tar - before copying the files, bundle them up into a tarball, copy over the tarball to the target system in one go, and untar it on the remote system by invoking
tar -xf <tarball> -C <tempdir>
ZipWindows - before copying the files, bundle them up into a zip archive, copy over the zip archive to the target system in one go, and unzip it using built-in powershell capabilities.
Note: The ZipWindows strategy uses
ExtractArchive, which is part of PowerShell 5.0 and higher. If you are running a Windows Server version older than Windows Server 2016, we recommend you upgrade to PowerShell 5.0 to take advantage of this feature. More information can be found here: Windows Powershell System Requirements.
- ZipUnix - similar to ZipWindows, but unzip it using a command-line invocation
unzip <archive> -d <tempdir>
In order to be backwards compatible, XL Deploy will default to the legacy OneByOne strategy.
This behaviour can however be overridden on a per-host basis. Any
overthere.Host CI has a new property called
Copy Strategy inside a new
Zip section, that allows you to select which strategy is to be used for deploying
file.Folder CIs to this host. Note that this is an optional value.
XL Deploy can detect which unzip/untar capabilities the target host has. This behaviour is turned off by default since this incurs a small detection overhead, but it can be enabled by setting
xl.task.artifact-copy-strategy.autodetect = true in
When set to
true, copy strategies are tried one by one, until one succeeds. For Windows target hosts, the try order is:
ZipWindows, Tar, ZipUnix, OneByOne. For Unix hosts, the try order is:
Tar, ZipUnix, ZipWindows, OneByOne. A test zip or tar archive will be copied to a temparary directory on the target host and the respective unzip/untar commands are tried. If these fail, the next strategy is tried; if it succeeds then the current strategy under test is picked for the deployment of the
To have a better look under the hood, configure
conf/logback.xml to enable
DEBUG logging on the
Example log output looks like this (with autodetect enabled, deploying to a Windows host):