zookeeper-notifications mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From GitBox <...@apache.org>
Subject [GitHub] [zookeeper] eolivelli commented on a change in pull request #1069: ZOOKEEPER-3056: Fails to load database with missing snapshot file but with valid transaction log file.
Date Sat, 31 Aug 2019 04:08:03 GMT
eolivelli commented on a change in pull request #1069: ZOOKEEPER-3056: Fails to load database
with missing snapshot file but with valid transaction log file.
URL: https://github.com/apache/zookeeper/pull/1069#discussion_r319710493
 
 

 ##########
 File path: zookeeper-server/src/main/java/org/apache/zookeeper/server/persistence/FileTxnSnapLog.java
 ##########
 @@ -232,11 +242,19 @@ public long restore(DataTree dt, Map<Long, Integer> sessions,
PlayBackListener l
         } else {
             trustEmptyDB = autoCreateDB;
         }
+
         if (-1L == deserializeResult) {
             /* this means that we couldn't find any snapshot, so we need to
              * initialize an empty database (reported in ZOOKEEPER-2325) */
             if (txnLog.getLastLoggedZxid() != -1) {
-                throw new IOException("No snapshot found, but there are log entries. " +
"Something is broken!");
+                // ZOOKEEPER-3056: provides an escape hatch for users upgrading
+                // from old versions of zookeeper (3.4.x, pre 3.5.3).
+                if (!trustEmptySnapshot) {
+                    throw new IOException(EMPTY_SNAPSHOT_WARNING + "Something is broken!");
+                } else {
+                    LOG.warn(EMPTY_SNAPSHOT_WARNING + "This should only be allowed during
upgrading.");
+                    trustEmptySnapshot = false;
 
 Review comment:
   If we call this method only once.
   Why should we reset this variable, as it won't be used anymore?
   
   Can you please give an example of multiple calls of this method?

----------------------------------------------------------------
This is an automated message from the Apache Git Service.
To respond to the message, please log on to GitHub and use the
URL above to go to the specific comment.
 
For queries about this service, please contact Infrastructure at:
users@infra.apache.org


With regards,
Apache Git Services

Mime
View raw message