Data management software proposal

I’m thinking of writing software to solve a problem. Before that, I wanted to write a proposal and find out what other people think about it. If you have any comments, please leave them at: or as a comment here.

tl;dr: data management software that logs access to files.

1. The problem:

Modern data analysis relies on many sophisticated tools that perform a wide range of calculations on data. While software continues to evolve along with methods, data management still remains a complicated problem.

First, data analysis involves a lot of trail and error. One method may work well on one dataset, but it may not work as well on another. In its nature, data analysis must be done many times to arrive upon the best solution (if there is one). This process of trial and error, however is costly in time and organization. While solutions exist to mitigate these problems (for example, software that runs other software for you), these solutions are not complete.

Specifically, organization is difficult because there is no obvious and systematic way to keep track of what has been done to data. For example, when assembling sequence data many assemblers must be used with different options to find the optimal assembly method and options. While it’s possible to keep track of what one has done in a script, this method will not capture any data analysis done outside of the script.

Second, over time, it becomes difficult to remember what analyses have been done on data. This can be addressed by appending descriptors to the filename (e.g. sample1.trimmed.qual.mapped.bam). However, this quickly becomes unwieldy and fails to capture exactly what has happened to the file (including program options).

2.The solution:

The project suggested here is a daemon that watches data directories using the inotify API. It stores information about what processes and users read and modify data and stores it in a hidden json log file in that directory. It will also support arbitrary metadata used to describe the data in the same json log file. For example, it can store information about how and when the data was collected. This information need not be present in all data, which provides flexibility in describing the data.

Second, this project will provide a local webserver to access and modify the logs in a user friendly manner. Because the log format is standard json, we can build upon previous web applications to quickly build a web front end, similar to CouchDB’s Futon (

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