Rbd - Copy-on-read for clones in kernel rbd client » History » Version 2
Jessica Mack, 07/03/2015 09:33 PM
1 | 1 | Jessica Mack | h1. Rbd - Copy-on-read for clones in kernel rbd client |
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2 | 1 | Jessica Mack | |
3 | 1 | Jessica Mack | h3. Summary |
4 | 1 | Jessica Mack | |
5 | 1 | Jessica Mack | Add feature copy-on-read in kernel rbd client to improve read performance of clones |
6 | 1 | Jessica Mack | |
7 | 1 | Jessica Mack | h3. Owners |
8 | 1 | Jessica Mack | |
9 | 1 | Jessica Mack | * Min Chen (minchen@ubuntukylin.com) |
10 | 1 | Jessica Mack | * Li Wang (liwang@ubuntukylin.com) |
11 | 1 | Jessica Mack | * Name |
12 | 1 | Jessica Mack | |
13 | 1 | Jessica Mack | h3. Interested Parties |
14 | 1 | Jessica Mack | |
15 | 1 | Jessica Mack | * Name (Affiliation) |
16 | 1 | Jessica Mack | * Name (Affiliation) |
17 | 1 | Jessica Mack | * Name |
18 | 1 | Jessica Mack | |
19 | 1 | Jessica Mack | h3. Current Status |
20 | 1 | Jessica Mack | |
21 | 1 | Jessica Mack | The kernel rbd client does not support clones copy-on-read. We have implement it in librbd |
22 | 2 | Jessica Mack | at https://github.com/ceph/ceph/pull/1808 |
23 | 1 | Jessica Mack | |
24 | 1 | Jessica Mack | h3. Detailed Description |
25 | 1 | Jessica Mack | |
26 | 1 | Jessica Mack | Network latency will be the bottleneck of reading object not exist in clone , because it will read object |
27 | 1 | Jessica Mack | from parent. We will use the same algorithm of copy-on-read in librbd. Firstly, read data from clone if |
28 | 1 | Jessica Mack | it exists, or else send request to its parent. Secondly, after get the object from parent, in callback function |
29 | 1 | Jessica Mack | write it directly into clone asynchronously with cls copyup. In addition, read the entire object from parent. |
30 | 1 | Jessica Mack | |
31 | 1 | Jessica Mack | h3. Work items |
32 | 1 | Jessica Mack | |
33 | 1 | Jessica Mack | h4. Coding tasks |
34 | 1 | Jessica Mack | |
35 | 1 | Jessica Mack | # Add an copy-on-read option |
36 | 1 | Jessica Mack | # In function rbd_img_obj_request_submit(), sending read request to parent. |
37 | 1 | Jessica Mack | |
38 | 1 | Jessica Mack | h4. Build / release tasks |
39 | 1 | Jessica Mack | |
40 | 1 | Jessica Mack | # Task 1 |
41 | 1 | Jessica Mack | # Task 2 |
42 | 1 | Jessica Mack | # Task 3 |
43 | 1 | Jessica Mack | |
44 | 1 | Jessica Mack | h4. Documentation tasks |
45 | 1 | Jessica Mack | |
46 | 1 | Jessica Mack | # Task 1 |
47 | 1 | Jessica Mack | # Task 2 |
48 | 1 | Jessica Mack | # Task 3 |
49 | 1 | Jessica Mack | |
50 | 1 | Jessica Mack | h4. Deprecation tasks |
51 | 1 | Jessica Mack | |
52 | 1 | Jessica Mack | # Task 1 |
53 | 1 | Jessica Mack | # Task 2 |
54 | 1 | Jessica Mack | # Task 3 |