Make the MultiXMLConfigurationSerializer More Reliable
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Key: SYNAPSE-664
URL: https://issues.apache.org/jira/browse/SYNAPSE-664
Project: Synapse
Issue Type: Improvement
Components: Core
Affects Versions: NIGHTLY
Reporter: Hiranya Jayathilaka
Assignee: Hiranya Jayathilaka
Fix For: 2.0
Currently this is how the MultiXMLConfigurationSerializer (MXCL) saves the
configuration to the file system:
1. Backup the existing synapse-config directory
2. Create a new synapse-config directory and the necessary child directories
3. Serialize the configuration to the files (this can fail due to an IO error -
eg: running out of file handles in the system)
4. Delete the backup
If step 2 or 3 fails, MXCL tries to restore the backup. But in most practical
scenarios, when IO operations fail, they fail in chunks. Therefore most of the
time, the restoration operation never succeeds. This can leave Synapse with
either no or partially done synapse-config directory. We can make the process
more reliable implementing the following strategy:
1. Create a temp directory
2. Serialize the entire configuration the temp directory (leave the original
synapse-config directory intact)
3. Once the serialization is completed move the temp directory as the new
synapse-config directory
This way if something goes wrong during serialization, the original
synapse-config directory won't be affected.
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