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etagとs3に関するyassのブックマーク (2)

  • AmazonS3におけるetagとmd5の関係をまとめてみた · DQNEO日記

    公式APIリファレンスによると ETag The entity tag is a hash of the object. The ETag only reflects changes to the contents of an object, not its metadata. The ETag is determined when an object is created. For objects created by the PUT Object operation and the POST Object operation, the ETag is a quoted, 32-digit hexadecimal string representing the MD5 digest of the object data. For other objects, the ETag may o

    AmazonS3におけるetagとmd5の関係をまとめてみた · DQNEO日記
    yass
    yass 2013/08/02
    "ETagはオブジェクトの内容のMD5ダイジェストであり、コンテンツの同一性チェックに使える。 ただし、マルチパートアップロードでアップロードしたオブジェクトは除く。"
  • GitHub - bloomreach/s4cmd: Super S3 command line tool

    Fully migrated from old boto 2.x to new boto3 library, which provides more reliable and up-to-date S3 backend. Support S3 --API-ServerSideEncryption along with 36 new API pass-through options. See API pass-through options section for complete list. Support batch delete (with delete_objects API) to delete up to 1000 files with single call. 100+ times faster than sequential deletion. Support S4CMD_O

    GitHub - bloomreach/s4cmd: Super S3 command line tool
    yass
    yass 2013/08/01
    "It is intended as an alternative to s3cmd for enhanced performance and for large files, and with a number of additional features and fixes that we have found useful. / The workaround we use is to upload the MD5 as a supplemental content header (called "md5", instead of "etag"). "
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