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Posted to dev@synapse.apache.org by "Hiranya Jayathilaka (JIRA)" <ji...@apache.org> on 2010/06/21 11:22:24 UTC
[jira] Commented: (SYNAPSE-664) Make the
MultiXMLConfigurationSerializer More Reliable
[ https://issues.apache.org/jira/browse/SYNAPSE-664?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12880758#action_12880758 ]
Hiranya Jayathilaka commented on SYNAPSE-664:
---------------------------------------------
Implemented the above mentioned safe strategy in MXCL.
> Make the MultiXMLConfigurationSerializer More Reliable
> ------------------------------------------------------
>
> 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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