A bug repository an important part in overseeing software bugs. Many open source programming ventures have an open bug repository that permits both developers and users to submit imperfections or problem in the product, recommend conceivable upgrades, and remark on existing bug reports. For open source large-scale software projects, the number of daily bugs is so large which makes the triaging process very hard and challenging. Software organizations spend more than 45 percent of cost in fixing

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... bugs .There are two difficulties identified with bug information that may influence the effective use of bug repositories in software development tasks, namely the large scale and the low quality. In a bug repository, a bug is kept up as a bug report, which records the printed description of imitating the bug and upgrades as indicated by the status of bug fixing.