hgromer commented on code in PR #8784:
URL: https://github.com/apache/hbase/pull/8784#discussion_r4348916067
##########
hbase-backup/src/main/java/org/apache/hadoop/hbase/backup/impl/BackupSystemTable.java:
##########
@@ -758,7 +762,11 @@ private BackupProtos.TableServerTimestamp
toTableServerTimestampProto(TableName
for (BackupProtos.ServerTimestamp st : list) {
ServerName sn =
org.apache.hadoop.hbase.shaded.protobuf.ProtobufUtil.toServerName(st.getServerName());
- map.put(sn.getHostname() + ":" + sn.getPort(), st.getTimestamp());
+ // Older versions stored mixed-case keys, so the stored map can hold an
entry under each
+ // spelling of a host. Both entries map to the same key here. Keeping
the oldest boundary
+ // includes more WALs in the next incremental backup, so it never skips
one.
+ map.merge(BackupUtils.toHostKey(sn.getHostname() + ":" + sn.getPort()),
st.getTimestamp(),
+ Math::min);
Review Comment:
Doesn't `min` open us up to reincluding WAL files that have already been
backed up, which could introduce resurrected data? IE, the case that you're
trying to solve in this patch?
--
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.
To unsubscribe, e-mail: [email protected]
For queries about this service, please contact Infrastructure at:
[email protected]
