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authorMohammed Rafi KC <rkavunga@redhat.com>2017-07-06 13:26:42 +0530
committerPranith Kumar Karampuri <pkarampu@redhat.com>2017-07-10 05:07:11 +0000
commitf2f3d74c835b68ad9ec63ec112870829a823a1fb (patch)
tree7cb9b9415e8b9b2ebdfff747ea345dbb8559dc03 /libglusterfs/src/common-utils.h
parent9e8ee31e643b7fbf7d46092c395ea27aaeb82f6b (diff)
mgtm/core : use sha hash function for volfile check
We are storing the entire volfile and using this to check volfile change. With brick multiplexing there will be lot of graphs per process which will increase the memory foot print of the process. So instead of storing the entire graph we could use sha256 and we can compare the hash to see whether volfile change happened or not. Also with Brick multiplexing, the direct comparison of vol file is not correct. There are two problems. Problem 1: We are currently storing one single graph (the last updated volfile) whereas, what we need is the entire graph with all atttached bricks. If we fix this issue, we have second problem Problem 2: With multiplexing we have a graph that contains multiple bricks. But what we are checking as part of the reconfigure is, comparing the entire graph with one single graph, which will always fail. Solution: We create list in glusterfs_ctx_t that stores sha256 hash of individual brick graphs. When a graph changes happens we compare the stored hash and the current hash. If the hash matches, then no need for reconfigure. Otherwise we first do the reconfigure and then update the hash. For now, gfapi has not changed this way. Meaning when gfapi volfile fetch or reconfigure happens, we still store the entire graph and compare, each memory. This is fine, because libgfapi will not load brick graphs. But changing the libgfapi will make the code similar in both glusterfsd-mgmt and api. Also it helps to reduce some memory. Change-Id: I9df917a771a52b95622ab8f63af34ec390163a77 BUG: 1467986 Signed-off-by: Mohammed Rafi KC <rkavunga@redhat.com> Reviewed-on: https://review.gluster.org/17709 Smoke: Gluster Build System <jenkins@build.gluster.org> Reviewed-by: Pranith Kumar Karampuri <pkarampu@redhat.com> CentOS-regression: Gluster Build System <jenkins@build.gluster.org> Reviewed-by: Atin Mukherjee <amukherj@redhat.com> Reviewed-by: Amar Tumballi <amarts@redhat.com>
Diffstat (limited to 'libglusterfs/src/common-utils.h')
-rw-r--r--libglusterfs/src/common-utils.h5
1 files changed, 5 insertions, 0 deletions
diff --git a/libglusterfs/src/common-utils.h b/libglusterfs/src/common-utils.h
index 6a260c090c8..86b7ec6c3d6 100644
--- a/libglusterfs/src/common-utils.h
+++ b/libglusterfs/src/common-utils.h
@@ -921,4 +921,9 @@ close_fds_except (int *fdv, size_t count);
int
gf_getgrouplist (const char *user, gid_t group, gid_t **groups);
+
+int
+glusterfs_compute_sha256 (const unsigned char *content, size_t size,
+ char *sha256_hash);
+
#endif /* _COMMON_UTILS_H */