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Enhancing HDFS with a full-text search system for massive small files

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Abstract

HDFS is a popular open-source system for scalable and reliable file management, which is designed as a general-purpose solution for distributed file storage. While it works well for medium or large files, it will suffer heavy performance degradations in case of lots of small files. To overcome this drawback, we propose here a system to enhance HDFS with a distributed true full-text search system SAES of 100% recall and precision ratios. By indexing the meta data of each file, e.g., name, size, date and description, files can be quickly accessed by efficient searches over metadata. Moreover, by merging many small files into a large file to be stored with better space and I/O efficiencies, the negative performance impacts caused by directly storing each small file individually are avoided. An experimental study is conducted for function and performance tests on both realistic and artificial data. The experimental results show that the system works well for file operations such as uploading, downloading and deleting. Moreover, the RAM consumption for managing massive small files is dramatically reduced, which is critical for good system performance. The proposed system could be a potential storage solution for massive small files.

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Notes

  1. https://github.com/alibaba/tfs.

  2. https://hadoop.apache.org/docs/current/hadoop-archives/HadoopArchives.html.

  3. https://hadoop.apache.org/docs/r2.7.5/api/org/apache/hadoop/io/SequenceFile.html.

  4. https://hadoop.apache.org/docs/r2.6.2/api/org/apache/hadoop/io/MapFile.html.

  5. https://www.elastic.com/cn/blog/elastic-search-7-2-0-released

  6. https://www.elastic.co/guide/en/elasticsearch/reference/current/analysis-ngram-tokenizer.html.

  7. https://jmeter.apache.org/.

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Acknowledgements

This work was funded by the National Natural Science Foundation of China (Grant number 61872391), the Guangzhou Science and Technology Program (Grant No. 201802010011), and the Foundation for Young Talents in Higher Education of Guangdong, China (Grant number 2019KQNCX031).

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Authors and Affiliations

  1. School of Computer Science and Engineering, Sun Yat-sen University, Guangzhou, China

    Wentao Xu, Xin Zhao & Ge Nong

  2. Guangdong Province Key Laboratory of Information Security Technology, Guangzhou, China

    Ge Nong

  3. School of Information Science and Technology, Guangdong University of Foreign Studies, Guangzhou, China

    Bin Lao

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  1. Wentao Xu
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Correspondence to Ge Nong.

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The work of X. Zhao was done in his Master program in Sun Yat-sen University.

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Xu, W., Zhao, X., Lao, B. et al. Enhancing HDFS with a full-text search system for massive small files. J Supercomput 77, 7149–7170 (2021). https://doi.org/10.1007/s11227-020-03526-1

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