BOOKKEEPER-879: Record ledger creation time

Author: eolivelli

bookkeeper-server/src/main/java/org/apache/bookkeeper/client/LedgerMetadata.java

@@ -366,9 +366,9 @@ public static LedgerMetadata parseConfig(byte[] bytes, Version version, Long zkC
         LedgerMetadataFormat data = builder.build();
         lc.writeQuorumSize = data.getQuorumSize();        
         if (data.hasCtime()) {
-            lc.ctime=data.getCtime();
+            lc.ctime = data.getCtime();
         } else if (zkCtime != null) {
-            lc.ctime=zkCtime;
+            lc.ctime = zkCtime;
         }        
         if (data.hasAckQuorumSize()) {
             lc.ackQuorumSize = data.getAckQuorumSize();

bookkeeper-server/src/main/java/org/apache/bookkeeper/meta/AbstractZkLedgerManager.java

@@ -352,10 +352,14 @@ public void processResult(int rc, String path, Object ctx, byte[] data, Stat sta
                     readCb.operationComplete(BKException.Code.ZKException, null);
                     return;
                 }
-
+                if (stat == null) {
+                    LOG.error("Could not parse ledger metadata for ledger: " + ledgerId+". Stat object is null");
+                    readCb.operationComplete(BKException.Code.ZKException, null);
+                    return;
+                }
                 LedgerMetadata metadata;
                 try {
-                    metadata = LedgerMetadata.parseConfig(data, new ZkVersion(stat.getVersion()),stat.getCtime());
+                    metadata = LedgerMetadata.parseConfig(data, new ZkVersion(stat.getVersion()), stat.getCtime());
                 } catch (IOException e) {
                     LOG.error("Could not parse ledger metadata for ledger: " + ledgerId, e);
                     readCb.operationComplete(BKException.Code.ZKException, null);

bookkeeper-server/src/main/java/org/apache/bookkeeper/meta/MSLedgerManagerFactory.java

@@ -408,7 +408,7 @@ public void complete(int rc, Versioned<Value> value, Object ctx) {
                     LedgerMetadata metadata;
                     try {
                         metadata = LedgerMetadata
-                                .parseConfig(value.getValue().getField(META_FIELD), value.getVersion(),null);
+                                .parseConfig(value.getValue().getField(META_FIELD), value.getVersion(), null);
                     } catch (IOException e) {
                         LOG.error("Could not parse ledger metadata for ledger " + ledgerId + " : ", e);
                         readCb.operationComplete(BKException.Code.MetaStoreException, null);