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(2603:10b6:5:25c::19) by DM5PR21MB1847.namprd21.prod.outlook.com (2603:10b6:4:aa::27) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4587.1; Thu, 30 Sep 2021 22:25:12 +0000 Received: from DM6PR21MB1513.namprd21.prod.outlook.com ([fe80::5409:9351:b7d8:9fa9]) by DM6PR21MB1513.namprd21.prod.outlook.com ([fe80::5409:9351:b7d8:9fa9%5]) with mapi id 15.20.4587.009; Thu, 30 Sep 2021 22:25:12 +0000 From: Long Li To: Greg Kroah-Hartman CC: Bart Van Assche , "longli@linuxonhyperv.com" , "linux-block@vger.kernel.org" , "linux-kernel@vger.kernel.org" , "linux-hyperv@vger.kernel.org" , Jonathan Corbet , KY Srinivasan , Haiyang Zhang , Stephen Hemminger , Wei Liu , Dexuan Cui , Bjorn Andersson , Hans de Goede , "Williams, Dan J" , Maximilian Luz , Mike Rapoport , Ben Widawsky , Jiri Slaby , Andra Paraschiv , Siddharth Gupta , Hannes Reinecke Subject: RE: [Patch v5 0/3] Introduce a driver to support host accelerated access to Microsoft Azure Blob 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rL1vQmeUyePh2Uwrpoq9uII3Wrt45ceBhOAZia12nM2IP1sZOsT+OWDBAaL5kXMfxSFSqK311pSNc0ytyg/KPw== X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM5PR21MB1847 Precedence: bulk List-ID: X-Mailing-List: linux-hyperv@vger.kernel.org > Subject: RE: [Patch v5 0/3] Introduce a driver to support host accelerate= d > access to Microsoft Azure Blob for Azure VM >=20 > > Subject: RE: [Patch v5 0/3] Introduce a driver to support host > > accelerated access to Microsoft Azure Blob for Azure VM > > > > > Subject: Re: [Patch v5 0/3] Introduce a driver to support host > > > accelerated access to Microsoft Azure Blob for Azure VM > > > > > > On Sat, Aug 07, 2021 at 06:29:06PM +0000, Long Li wrote: > > > > > I still think this "model" is totally broken and wrong overall. > > > > > Again, you are creating a custom "block" layer with a character > > > > > device, forcing all userspace programs to use a custom library > > > > > (where is it > > > at?) just to get their data. > > > > > > > > The Azure Blob library (with source code) is available in the > > > > following > > > languages: > > > > Java: > > > > > https://nam06.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2F > > > > gi > > > > th > > > > ub.com%2FAzure%2Fazure-sdk-for- > > > java%2Ftree%2Fmain%2Fsdk%2Fstorage%2Faz > > > > ure-storage- > > > blob&data=3D04%7C01%7Clongli%40microsoft.com%7C778083147 > > > > > > > 8ed49b16e6308d95a2b7ae8%7C72f988bf86f141af91ab2d7cd011db47%7C1 > > > %7C0%7C6 > > > > > > > > 37639965101378114%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwM > > > DAiLCJQIjoi > > > > > > > > V2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=3DwcNhsEo > H > > > LV0VBc > > > > uDf0CVXl7W0Ug9Cj7Q92%2Bw6qizroU%3D&reserved=3D0 > > > > JavaScript: > > > > > https://nam06.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2F > > > > gi > > > > th > > > > ub.com%2FAzure%2Fazure-sdk-for- > > > js%2Ftree%2Fmain%2Fsdk%2Fstorage%2Fstor > > > > age- > > > > blob&data=3D04%7C01%7Clongli%40microsoft.com%7C7780831478ed49b > > > 16 > > > > > > > e6308d95a2b7ae8%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C > > > 637639965 > > > > > > > > 101378114%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIj > o > > > iV2luMzIi > > > > > > > > LCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=3DI%2FfhdPX3Unz6S > 3 > > > eBPcpl > > > > %2Bh55nKoV0u%2FO0%2BYgjLy4grQ%3D&reserved=3D0 > > > > Python: > > > > > https://nam06.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2F > > > > gi > > > > th > > > > ub.com%2FAzure%2Fazure-sdk-for- > > > python%2Ftree%2Fmain%2Fsdk%2Fstorage%2F > > > > azure-storage- > > > blob&data=3D04%7C01%7Clongli%40microsoft.com%7C7780831 > > > > > > > 478ed49b16e6308d95a2b7ae8%7C72f988bf86f141af91ab2d7cd011db47%7 > > > C1%7C0%7 > > > > > > > > C637639965101378114%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAw > > > MDAiLCJQIj > > > > > > > > oiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=3DaAwsi% > 2 > > > BPVsN > > > > tsDMJ7rKnRDigNc41fIao031lde247Nc0%3D&reserved=3D0 > > > > Go: > > > > > https://nam06.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2F > > > > gi > > > > th > > > > ub.com%2FAzure%2Fazure-storage-blob- > > > go&data=3D04%7C01%7Clongli%40mic > > > > > > > > rosoft.com%7C7780831478ed49b16e6308d95a2b7ae8%7C72f988bf86f141a > > > f91ab2d > > > > > > > > 7cd011db47%7C1%7C0%7C637639965101378114%7CUnknown%7CTWFpbG > > > Zsb3d8eyJWIj > > > > > > > > oiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1 > 0 > > > 00&am > > > > > > > > p;sdata=3D43JhbGsYQxA%2FoivNd7C3z7DSYO%2FPONCoaW2v7TN6xEU%3D&a > > > mp;reserve > > > > d=3D0 > > > > .NET: > > > > > https://nam06.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2F > > > > gi > > > > th > > > > ub.com%2FAzure%2Fazure-sdk-for- > > > net%2Ftree%2Fmain%2Fsdk%2Fstorage%2FAzu > > > > > > > > re.Storage.Blobs&data=3D04%7C01%7Clongli%40microsoft.com%7C77808 > > > 3147 > > > > > > > 8ed49b16e6308d95a2b7ae8%7C72f988bf86f141af91ab2d7cd011db47%7C1 > > > %7C0%7C6 > > > > > > > > 37639965101378114%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwM > > > DAiLCJQIjoi > > > > > > > > V2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=3D6ClMeURl > t > > > cBv1q > > > > 7l7PGGrxXVJbVDt9uMBlwoIVh7Wpw%3D&reserved=3D0 > > > > PHP: > > > > > https://nam06.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2F > > > > gi > > > > th > > > > ub.com%2FAzure%2Fazure-storage-php%2Ftree%2Fmaster%2Fazure- > > > storage-blo > > > > > > > > b&data=3D04%7C01%7Clongli%40microsoft.com%7C7780831478ed49b16 > > > e6308d9 > > > > > > > 5a2b7ae8%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C6376399 > > > 651013781 > > > > > > > > 14%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luM > zIi > > > LCJBTiI > > > > > > > > 6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=3DDuZO539vd76c%2Byaqjn > > > hetp%2B3T > > > > i0b74601ZkNe39SNK4%3D&reserved=3D0 > > > > Ruby: > > > > > https://nam06.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2F > > > > gi > > > > th > > > > ub.com%2Fazure%2Fazure-storage- > > > ruby%2Ftree%2Fmaster%2Fblob&data=3D04 > > > > %7C01%7Clongli%40microsoft.com%7C7780831478ed49b16e6308d95a2 > b > > > 7ae8%7C72 > > > > > > > f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C637639965101378114%7 > > > CUnknown% > > > > > > > > 7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haW > wi > > > LCJX > > > > > > > > VCI6Mn0%3D%7C1000&sdata=3D6Zviu1IuRQE2do9bDCae2iJv0W2KOJu90t > > > XSR6kDAR > > > > 4%3D&reserved=3D0 > > > > C++: > > > > > > > > C++https://nam06.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2 > > > C++Fg > > > > C++ithub.com%2FAzure%2Fazure-sdk-for- > > > cpp%2Ftree%2Fmain%2Fsdk%2Fstorage > > > > C++%23azure-storage-client-library-for- > > > c&data=3D04%7C01%7Clongli%40m > > > > > > > > C++icrosoft.com%7C7780831478ed49b16e6308d95a2b7ae8%7C72f988bf86 > > > f141af9 > > > > > > > C++1ab2d7cd011db47%7C1%7C0%7C637639965101388074%7CUnknown% > > > 7CTWFpbGZsb3 > > > > > > > > > > C++d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6 > Mn > > > 0%3 > > > > > > > > C++D%7C1000&sdata=3DHH6jrqREWQ%2BkoRR%2Fsb02wRXnuLU5il4Erzm > > > rBvUZu5w% > > > > C++3D&reserved=3D0 > > > > > > And why wasn't this linked to in the changelog here? > > > > > > In looking at the C code above, where is the interaction with this Li= nux > driver? > > > I can't seem to find it... >=20 > Greg, >=20 > I apologize for the delay. I have attached the Java transport library (a = tgz file) > in the email. The file is released for review under "The MIT License (MIT= )". >=20 > The transport library implemented functions needed for reading from a Blo= ck > Blob using this driver. The function for transporting I/O is > Java_com_azure_storage_fastpath_driver_FastpathDriver_read(), defined > in "./src/fastpath/jni/fpjar_endpoint.cpp". >=20 > In particular, requestParams is in JSON format (REST) that is passed from= a > Blob application using Blob API for reading from a Block Blob. >=20 > For an example of how a Blob application using the transport library, ple= ase > see Blob support for Hadoop ABFS: > https://nam06.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Fgith > ub.com%2Fapache%2Fhadoop%2Fpull%2F3309%2Fcommits%2Fbe7d12662e2 > 3a13e6cf10cf1fa5e7eb109738e7d&data=3D04%7C01%7Clongli%40microsof > t.com%7C3acb68c5fd6144a1857908d97e247376%7C72f988bf86f141af91ab2d7 > cd011db47%7C1%7C0%7C637679518802561720%7CUnknown%7CTWFpbGZsb > 3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0 > %3D%7C1000&sdata=3D6z3ZXPtMC5OvF%2FgrtbcRdFlqzzR1xJNRxE2v2Qrx > FL8%3D&reserved=3D0 >=20 > In ABFS, the entry point for using Blob I/O is at AbfsRestOperation > executeRead() in hadoop-tools/hadoop- > azure/src/main/java/org/apache/hadoop/fs/azurebfs/services/AbfsInputStr > eam.java, from line 553 to 564, this function eventually calls into > executeFastpathRead() in hadoop-tools/hadoop- > azure/src/main/java/org/apache/hadoop/fs/azurebfs/services/AbfsClient.ja > va. >=20 > ReadRequestParameters is the data that is passed to requestParams > (described above) in the transport library. In this Blob application use-= case, > ReadRequestParameters has eTag and sessionInfo (sessionToken). They are > both defined in this commit, and are treated as strings passed in JSON fo= rmat > to I/O issuing function > Java_com_azure_storage_fastpath_driver_FastpathDriver_read() in the > transport library using this driver. >=20 > Thanks, > Long Hello Greg, I have shared the source code of the Blob client using this driver, and the= reason why the Azure Blob driver is not implemented through POSIX with fil= e system and Block layer. Blob APIs are specified in this doc: https://docs.microsoft.com/en-us/rest/api/storageservices/blob-service-rest= -api The semantic of reading data from Blob is specified in this doc: https://docs.microsoft.com/en-us/rest/api/storageservices/get-blob The source code I shared demonstrated how a Blob is read to Hadoop through = ABFS. In general, A Blob client can use any optional request headers specif= ied in the API suitable for its specific application. The Azure Blob servic= e is not designed to be POSIX compliant. I hope this answers your question = on why this driver is not implemented at file system or block layer. Do you have more comments on this driver? Thanks, Long