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From "Hiranya Jayathilaka (JIRA)" <>
Subject [jira] Created: (SYNAPSE-664) Make the MultiXMLConfigurationSerializer More Reliable
Date Mon, 21 Jun 2010 08:54:25 GMT
Make the MultiXMLConfigurationSerializer More Reliable

                 Key: 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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