rdblue commented on a change in pull request #497: Support retaining last N
snapshots
URL: https://github.com/apache/incubator-iceberg/pull/497#discussion_r330158860
##########
File path: core/src/main/java/org/apache/iceberg/RemoveSnapshots.java
##########
@@ -82,6 +83,18 @@ public ExpireSnapshots expireOlderThan(long
timestampMillis) {
return this;
}
+ @Override
+ public ExpireSnapshots retainLast(int numSnapshots) {
+ Preconditions.checkArgument(1 < numSnapshots,
+ "Number of snapshots to retain must be at least 1, cannot be: %s",
numSnapshots);
+ LOG.info("Retaining last {} snapshots and expiring older snapshots",
numSnapshots);
+ Snapshot nthSnapshot = findNthSnapshot(numSnapshots);
+ if (nthSnapshot != null) {
+ expireOlderThan(nthSnapshot.timestampMillis());
Review comment:
If both work with one another, there is no need to let the caller know if
both are called. I think the right solution is to make the two settings
compatible.
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