This page records various design issues for the Event Store.

2005/05/09

• EventStore file format description:
• binary_location_format.html: This is the description of binary location file format
• pds_location_format.html: This is the description of PDS location file format
• key_format.html: This is the description of key (index) format-independent file
• binary_format.html: This is the description of binary file format
• pds_format.html: This is the description of PDS (Packed Data Stream) file format

2005/04/12

• ESWorkflow.html: This is the EventStore workflow.
• ESDBSchema.html: This is the EventStore database schema as of 2005/04/12.

2005/04/07

• BeginrunVersioning is a proposal to record provenance info in a new data type in beginrun records

2005/04/05

• EventStoreAdministration describes a various administration tasks, common use cases and existing admin. tools.

2005/02/18

• This is the metadata database schema as of 2005/02/18:
  
• MetaDBSchema.html: This is the metadata database schema as of 2005/02/18.

2005/02/16

• PopulationFlow.html: This describes the Raw Data population dataflow.

2005/02/14: The injection policy is described in the following documents.

The original design docs are out of date, but possibly instructional.

Also see the initial versioning system document.

Recent design decisions:

2005/02/14:

1. The EventStore graph and injection policies.

2005/01/27:

1. CLEOcDataPathSpecification

2004/11/12:

1. We will proceed with xrootd for disk cache management.

2004/11/01:

1. Raw data will be populated directly into the HSM. Raw run files will no longer be truncated. Instead, the keyfiles (which are small) will not refer to events that have been deemed unacceptable.
2. No truncation will be permitted after reconstruction has begun.

-- GregorySharp - 17 Nov 2004