blambov commented on code in PR #4245:
URL: https://github.com/apache/cassandra/pull/4245#discussion_r2231350425
##########
src/java/org/apache/cassandra/db/memtable/TrieMemtable.java:
##########
@@ -360,8 +360,8 @@ public FlushablePartitionSet<MemtablePartition>
getFlushSet(PartitionPosition fr
{
boolean allPositionsToFlush = from == null && to == null
|| from != null && to != null
- && from.isMinimum()
- && to.isMaximum();
+ && from.isMinimum() && from.kind() ==
PartitionPosition.Kind.MIN_BOUND
Review Comment:
The minimum token is something reserved for boundaries (i.e. the computed
hash is adjusted to avoid it) thus the `MIN_BOUND` check here is unnecessary.
AFAIAA other uses of `isMinimum` don't check this, and I believe we also use
minimum with `MAX_BOUND` in some cases, which will fail this check when the
intention is to fully cover the lower side of the ring.
##########
src/java/org/apache/cassandra/db/memtable/TrieMemtable.java:
##########
@@ -382,25 +383,32 @@ public FlushablePartitionSet<MemtablePartition>
getFlushSet(PartitionPosition fr
int toShardFull;
int toShardPartial;
- if (from == null || from.isMinimum())
+ if (from == null || from.isMinimum() && from.kind() ==
PartitionPosition.Kind.MIN_BOUND)
Review Comment:
... also applicable here.
##########
src/java/org/apache/cassandra/dht/Token.java:
##########
@@ -425,6 +430,11 @@ public boolean isMinimum()
return getToken().isMinimum();
}
+ public boolean isMaximum()
+ {
+ return getToken().isMaximum();
Review Comment:
As explained above, we do need `&& !isMinimumBound` here.
##########
src/java/org/apache/cassandra/db/memtable/TrieMemtable.java:
##########
@@ -382,25 +383,32 @@ public FlushablePartitionSet<MemtablePartition>
getFlushSet(PartitionPosition fr
int toShardFull;
int toShardPartial;
- if (from == null || from.isMinimum())
+ if (from == null || from.isMinimum() && from.kind() ==
PartitionPosition.Kind.MIN_BOUND)
fromShardFull = fromShardPartial = 0;
else
{
fromShardPartial = boundaries.getShardForToken(from.getToken());
- Token fromStartBoundaryToken =
boundaries.getShardStartBoundary(fromShardPartial);
- if (fromStartBoundaryToken != null &&
from.equals(fromStartBoundaryToken.maxKeyBound()))
+ // not symmetric to "to" logic because the start part of shard
ranges is exclusive
+ Token fromEndBoundaryToken =
boundaries.getShardEndBoundary(fromShardPartial);
+ if (fromEndBoundaryToken != null &&
from.equals(fromEndBoundaryToken.maxKeyBound()))
+ {
+ fromShardPartial++;
fromShardFull = fromShardPartial;
+ }
else
fromShardFull = fromShardPartial + 1;
}
- if (to == null || to.isMaximum())
+ if (to == null || to.isMaximum() && to.kind() ==
PartitionPosition.Kind.MAX_BOUND)
Review Comment:
... and here
##########
src/java/org/apache/cassandra/db/memtable/TrieMemtable.java:
##########
@@ -360,8 +360,8 @@ public FlushablePartitionSet<MemtablePartition>
getFlushSet(PartitionPosition fr
{
boolean allPositionsToFlush = from == null && to == null
|| from != null && to != null
- && from.isMinimum()
- && to.isMaximum();
+ && from.isMinimum() && from.kind() ==
PartitionPosition.Kind.MIN_BOUND
+ && to.isMaximum() && to.kind() ==
PartitionPosition.Kind.MAX_BOUND;
Review Comment:
To clarify (or add to the confusion), the maximum is sometimes out of scope
(`RandomPartitioner`) and other times isn't (`Murmur3Partitioner`). The
`MAX_BOUND` check is necessary for the maximum, but it should be part of the
`isMaximum` call rather than done here.
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