[SERVER-13678] filemd5 should support an arbitrary range of chunks to hash Created: 22/Apr/14 Updated: 03/Sep/14 Resolved: 03/Sep/14 |
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| Status: | Closed |
| Project: | Core Server |
| Component/s: | GridFS |
| Affects Version/s: | 2.6.0 |
| Fix Version/s: | None |
| Type: | Improvement | Priority: | Major - P3 |
| Reporter: | Robert Ditthardt | Assignee: | Ramon Fernandez Marina |
| Resolution: | Incomplete | Votes: | 0 |
| Labels: | gridfs, query | ||
| Remaining Estimate: | Not Specified | ||
| Time Spent: | Not Specified | ||
| Original Estimate: | Not Specified | ||
| Participants: |
| Description |
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My specific use case is implementing copy on write in my gridfs driver. I would like to update some chunks in a very large file and then use filemd5 to hash just the chunks that I wrote. I could then compare that hash to the hash of the chunks that I have written to in memory to make sure the entire write succeeded. If the hashes match, I would make them permanent. Otherwise, I would roll back the write. As you can see, I don't really have a performant workaround for this particular use case... My only option is to filemd5 the entire file, which is inefficient. |
| Comments |
| Comment by Ramon Fernandez Marina [ 03/Sep/14 ] |
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dditthardt, we haven't heard back from you for a while, so we're going to mark this issue as resolved. If you want to pursue this improvement feel free to reopen the ticket and provide more details on your use case(s). Regards, |
| Comment by Ramon Fernandez Marina [ 19/Aug/14 ] |
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dditthardt, we haven't heard from you for a while. If you are still interested in pursuing this improvement, could you please follow up and provide further details on your use case(s)? Thanks, |
| Comment by Ramon Fernandez Marina [ 22/Jul/14 ] |
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dditthardt, can you please elaborate further on your use case? The more information you can provide the better we can determine how to best address your needs here. |
| Comment by Robert Ditthardt [ 23/Apr/14 ] |
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What would be even better would be to allow specification of a query to match the chunks the user wants to find, and also what field to use. Then, make filemd5 a wrapper around this generic md5 command. |