Change in vdsm[ovirt-3.3]: Read pool metadata once in StoragePool.getInfo()

[Federico Simoncelli]

Hello Dan Kenigsberg, Eduardo,

I'd like you to do a code review.  Please visit

http://gerrit.ovirt.org/20191

to review the following change.

Change subject: Read pool metadata once in StoragePool.getInfo()
......................................................................

Read pool metadata once in StoragePool.getInfo()

The behavioural change of spm_id should be safe since
StoragePool.getInfo() call in  hsm.getStoragePoolInfo() is under
the (shared) pool lock making startSpm block in this host when
the info is retrieved.

Making repoStats pool independent.

Bug-Url: https://bugzilla.redhat.com/show_bug.cgi?id=1019273
Change-Id: I41a79662a4bd01fc310aa5554c38a16f3f8ba546
Signed-off-by: Eduardo 
Reviewed-on: http://gerrit.ovirt.org/14672
Reviewed-by: Dan Kenigsberg 
---
M vdsm/storage/sp.py
1 file changed, 15 insertions(+), 13 deletions(-)

git pull ssh://gerrit.ovirt.org:29418/vdsm refs/changes/91/20191/1

diff --git a/vdsm/storage/sp.py b/vdsm/storage/sp.py
index 8bab500..7dab69d 100644
--- a/vdsm/storage/sp.py
+++ b/vdsm/storage/sp.py
@@ -1496,26 +1496,28 @@
             raise se.StoragePoolMasterNotFound(self.spUUID, msdUUID)

try:
-            poolInfo = {
-                'type': msdInfo['type'],
-                'name': self.getDescription(),
-                'domains': domainListEncoder(self.getDomains()),
-                'master_uuid': msdUUID,
-                'master_ver': self.getMasterVersion(),
-                'lver': self.getMetaParam(PMDK_LVER),
-                'spm_id': self.getSpmId(),
-                'pool_status': 'uninitialized',
-                'version': str(self.getVersion()),
-                'isoprefix': '',
-            }
+            pmd = self._getPoolMD(self.masterDomain)
         except Exception:
             self.log.error("Pool metadata error", exc_info=True)
             raise se.StoragePoolActionError(self.spUUID)

+        poolInfo = {
+            'type': msdInfo['type'],
+            'name': pmd[PMDK_POOL_DESCRIPTION],
+            'domains': domainListEncoder(pmd[PMDK_DOMAINS]),
+            'master_uuid': self.masterDomain.sdUUID,
+            'master_ver': pmd[PMDK_MASTER_VER],
+            'lver': pmd[PMDK_LVER],
+            'spm_id': pmd[PMDK_SPM_ID],
+            'pool_status': 'uninitialized',
+            'version': str(msdInfo['version']),
+            'isoprefix': '',
+        }
+
         domInfo = {}
         repoStats = self.getRepoStats()

-        for sdUUID, sdStatus in self.getDomains().iteritems():
+        for sdUUID, sdStatus in pmd[PMDK_DOMAINS].iteritems():
             # Return statistics for active domains only
             domInfo[sdUUID] = {'status': sdStatus, 'alerts': []}