features/libgfchangelog: Log failure in gf_histroy_changelog

Add error logs if gf_history_changelog fails. If requested
changelog range is not available, log the error and exit
instead of continuing the loop and exiting in readdir
without logging. Also fixed the duplicate MSGID number in
'changelog-lib-messages.h'

> Change-Id: Icd71b89ae23b48a71380657ba5649029c32fabfd
> BUG: 1362151
> Signed-off-by: Kotresh HR <khiremat@redhat.com>
> Reviewed-on: http://review.gluster.org/15064
> Smoke: Gluster Build System <jenkins@build.gluster.org>
> CentOS-regression: Gluster Build System <jenkins@build.gluster.org>
> NetBSD-regression: NetBSD Build System <jenkins@build.gluster.org>
> Reviewed-by: Aravinda VK <avishwan@redhat.com>

Change-Id: Icd71b89ae23b48a71380657ba5649029c32fabfd
BUG: 1365879
Signed-off-by: Kotresh HR <khiremat@redhat.com>
(cherry picked from commit 949472d7561d3bfd67d8204e433a25dbc8a596cc)
Reviewed-on: http://review.gluster.org/15138
NetBSD-regression: NetBSD Build System <jenkins@build.gluster.org>
CentOS-regression: Gluster Build System <jenkins@build.gluster.org>
Smoke: Gluster Build System <jenkins@build.gluster.org>
Reviewed-by: Aravinda VK <avishwan@redhat.com>

5 files changed, 34 insertions, 6 deletions

diff --git a/geo-replication/syncdaemon/libgfchangelog.py b/geo-replication/syncdaemon/libgfchangelog.py
index 1d580caf6e8..d87b56cd941 100644
--- a/geo-replication/syncdaemon/libgfchangelog.py
+++ b/geo-replication/syncdaemon/libgfchangelog.py
@@ -11,7 +11,7 @@
 import os
 from ctypes import CDLL, RTLD_GLOBAL, create_string_buffer, get_errno, byref, c_ulong
 from ctypes.util import find_library
-from syncdutils import ChangelogException
+from syncdutils import ChangelogException, ChangelogHistoryNotAvailable
 
 
 class Changes(object):
@@ -99,6 +99,9 @@ class Changes(object):
         if ret == -1:
             cls.raise_changelog_err()
 
+        if ret == -2:
+            raise ChangelogHistoryNotAvailable()
+
         return (ret, actual_end.value)
 
     @classmethod
diff --git a/geo-replication/syncdaemon/resource.py b/geo-replication/syncdaemon/resource.py
index bc7b13c95bc..ed0e7efe2b2 100644
--- a/geo-replication/syncdaemon/resource.py
+++ b/geo-replication/syncdaemon/resource.py
@@ -36,7 +36,7 @@ import syncdutils
 from syncdutils import GsyncdError, select, privileged, boolify, funcode
 from syncdutils import umask, entry2pb, gauxpfx, errno_wrap, lstat
 from syncdutils import NoPurgeTimeAvailable, PartialHistoryAvailable
-from syncdutils import ChangelogException
+from syncdutils import ChangelogException, ChangelogHistoryNotAvailable
 from syncdutils import CHANGELOG_AGENT_CLIENT_VERSION
 from gsyncdstatus import GeorepStatus
 
@@ -1503,6 +1503,9 @@ class GLUSTER(AbstractUrl, SlaveLocal, SlaveRemote):
                 logging.info('Partial history available, using xsync crawl'
                              ' after consuming history till %s' % str(e))
                 g1.crawlwrap(oneshot=True, register_time=register_time)
+            except ChangelogHistoryNotAvailable:
+                logging.info('Changelog history not available, using xsync')
+                g1.crawlwrap(oneshot=True, register_time=register_time)
             except NoPurgeTimeAvailable:
                 logging.info('No stime available, using xsync crawl')
                 g1.crawlwrap(oneshot=True, register_time=register_time)
diff --git a/geo-replication/syncdaemon/syncdutils.py b/geo-replication/syncdaemon/syncdutils.py
index 9d89a3cd415..40eff050a9e 100644
--- a/geo-replication/syncdaemon/syncdutils.py
+++ b/geo-replication/syncdaemon/syncdutils.py
@@ -501,6 +501,8 @@ class NoPurgeTimeAvailable(Exception):
 class PartialHistoryAvailable(Exception):
     pass
 
+class ChangelogHistoryNotAvailable(Exception):
+    pass
 
 class ChangelogException(OSError):
     pass
diff --git a/xlators/features/changelog/lib/src/changelog-lib-messages.h b/xlators/features/changelog/lib/src/changelog-lib-messages.h
index 976c67f61a9..a6209af71ee 100644
--- a/xlators/features/changelog/lib/src/changelog-lib-messages.h
+++ b/xlators/features/changelog/lib/src/changelog-lib-messages.h
@@ -45,7 +45,7 @@
  */
 
 #define GLFS_COMP_BASE_CHANGELOG_LIB GLFS_MSGID_COMP_CHANGELOG_LIB
-#define GLFS_NUM_MESSAGES 28
+#define GLFS_NUM_MESSAGES 32
 #define GLFS_MSGID_END (GLFS_COMP_BASE_CHANGELOG_LIB + GLFS_NUM_MESSAGES + 1)
 
 #define glfs_msg_start_x GLFS_COMP_BASE_CHANGELOG_LIB,\
@@ -280,8 +280,15 @@
  * @recommended action
 */
 #define CHANGELOG_LIB_MSG_PTHREAD_JOIN_FAILED \
-        (GLFS_COMP_BASE_CHANGELOG_LIB + 20)
+        (GLFS_COMP_BASE_CHANGELOG_LIB + 31)
 
+/*!
+ * @messageid
+ * @diagnosis
+ * @recommended action
+*/
+#define CHANGELOG_LIB_MSG_HIST_FAILED \
+        (GLFS_COMP_BASE_CHANGELOG_LIB + 32)
 
 #define glfs_msg_end_x GLFS_MSGID_END, "Invalid: End of messages"
 #endif /* !_CHANGELOG_MESSAGES_H_ */
diff --git a/xlators/features/changelog/lib/src/gf-history-changelog.c b/xlators/features/changelog/lib/src/gf-history-changelog.c
index 389b65f3b16..bc7b451fb08 100644
--- a/xlators/features/changelog/lib/src/gf-history-changelog.c
+++ b/xlators/features/changelog/lib/src/gf-history-changelog.c
@@ -808,6 +808,9 @@ gf_history_changelog (char* changelog_dir, unsigned long start,
 
         ret = pthread_attr_init (&attr);
         if (ret != 0) {
+                gf_msg (this->name, GF_LOG_ERROR, errno,
+                        CHANGELOG_LIB_MSG_PTHREAD_ERROR,
+                        "Pthread init failed");
                 return -1;
         }
 
@@ -831,6 +834,10 @@ gf_history_changelog (char* changelog_dir, unsigned long start,
 
         /* basic sanity check */
         if (start > end || n_parallel <= 0) {
+                gf_msg (this->name, GF_LOG_ERROR, errno,
+                        CHANGELOG_LIB_MSG_HIST_FAILED, "Sanity check failed. "
+                        "START - %lu END - %lu THREAD_COUNT - %d",
+                        start, end, n_parallel);
                 ret = -1;
                 goto out;
         }
@@ -959,8 +966,14 @@ gf_history_changelog (char* changelog_dir, unsigned long start,
 
                         goto out;
 
-                } /* end of range check */
-
+                } else {/* end of range check */
+                        gf_msg (this->name, GF_LOG_ERROR, errno,
+                        CHANGELOG_LIB_MSG_HIST_FAILED, "Requested changelog "
+                        "range is not available. START - %lu CHLOG_MIN - %lu "
+                        "CHLOG_MAX - %lu", start, min_ts, max_ts);
+                        ret = -2;
+                        goto out;
+                }
         } /* end of readdir() */
 
         if (!from || !to)