Project

General

Profile

CommonFormatter - make it streamable » History » Version 1

Jessica Mack, 05/28/2015 05:29 PM

1 1 Jessica Mack
h1. CommonFormatter - make it streamable
2 1 Jessica Mack
3 1 Jessica Mack
h3. Task Name: 
4 1 Jessica Mack
5 1 Jessica Mack
make Formatter streamable
6 1 Jessica Mack
7 1 Jessica Mack
h3. Size:
8 1 Jessica Mack
 
9 1 Jessica Mack
S
10 1 Jessica Mack
11 1 Jessica Mack
h3. Skill:
12 1 Jessica Mack
 
13 1 Jessica Mack
intermediate
14 1 Jessica Mack
15 1 Jessica Mack
h3. Mentor(s):
16 1 Jessica Mack
17 1 Jessica Mack
Sage Weil sage@inktank.com
18 1 Jessica Mack
 
19 1 Jessica Mack
h3. Components:
20 1 Jessica Mack
 
21 1 Jessica Mack
common/Formatter
22 1 Jessica Mack
optionally adjust users
23 1 Jessica Mack
24 1 Jessica Mack
h3. Description:
25 1 Jessica Mack
26 1 Jessica Mack
The current Formatter interface accumulates everything in an in-memory buffer (or buffers, even), which makes it unusable in cases where we are dumping/formatter large amounts of memory (e.g., a significant portion of the allocate memory).  We should make an alternative interface that lets you specify an ostream for the Formatter and emits output as it goes (instead of appending to the buffer).
27 1 Jessica Mack
28 1 Jessica Mack
h3. External Documentation:
29 1 Jessica Mack
30 1 Jessica Mack
Edit section
31 1 Jessica Mack
 http://stackoverflow.com/questions/524641/how-do-i-create-my-own-ostream-streambuf
32 1 Jessica Mack
 
33 1 Jessica Mack
there is also an ostream stream_buf in tree; see https://github.com/ceph/ceph/blob/master/src/common/PrebufferedStreambuf.h