Github user keith-turner commented on a diff in the pull request:
https://github.com/apache/accumulo/pull/275#discussion_r125126212
--- Diff:
core/src/main/java/org/apache/accumulo/core/iterators/system/LocalityGroupIterator.java
---
@@ -97,75 +134,122 @@ public static final int seek(HeapIterator hiter,
LocalityGroup[] groups, Set<Byt
else
cfSet = Collections.emptySet();
- for (LocalityGroup lgr : groups) {
- // when include is set to true it means this locality groups contains
- // wanted column families
- boolean include = false;
+ // determine the set of groups to use
+ Collection<LocalityGroup> groupsToUse = Collections.EMPTY_LIST;
- if (cfSet.size() == 0) {
- include = !inclusive;
- } else if (lgr.isDefaultLocalityGroup && lgr.columnFamilies == null)
{
- // do not know what column families are in the default locality
group,
- // only know what column families are not in it
+ // if no column families specified, then include all groups unless
!inclusive
+ if (cfSet.size() == 0) {
+ if (!inclusive) {
+ groupsToUse = groups.groups;
+ }
+ } else {
+ groupsToUse = new HashSet<LocalityGroup>();
+ // do not know what column families are in the default locality
group,
+ // only know what column families are not in it
+ if (groups.defaultGroup != null) {
if (inclusive) {
- if (!nonDefaultColumnFamilies.containsAll(cfSet)) {
+ if (!groups.groupByCf.keySet().containsAll(cfSet)) {
// default LG may contain wanted and unwanted column families
- include = true;
+ groupsToUse.add(groups.defaultGroup);
}// else - everything wanted is in other locality groups, so
nothing to do
} else {
- // must include, if all excluded column families are in other
locality groups
- // then there are not unwanted column families in default LG
- include = true;
+ // must include the default group as it may include cfs not in
our cfSet
+ groupsToUse.add(groups.defaultGroup);
+ }
+ }
+
+ /*
+ * Need to consider the following cases for inclusive and exclusive
(lgcf:locality group column family set, cf:column family set) lgcf and cf are
disjoint
+ * lgcf and cf are the same cf contains lgcf lgcf contains cf lgccf
and cf intersect but neither is a subset of the other
+ */
+ if (!inclusive) {
+ for (Entry<ByteSequence,LocalityGroup> entry :
groups.groupByCf.entrySet()) {
+ if (!cfSet.contains(entry.getKey())) {
+ groupsToUse.add(entry.getValue());
+ }
+ }
+ } else if (groups.groupByCf.size() <= cfSet.size()) {
+ for (Entry<ByteSequence,LocalityGroup> entry :
groups.groupByCf.entrySet()) {
+ if (cfSet.contains(entry.getKey())) {
+ groupsToUse.add(entry.getValue());
+ }
}
} else {
- /*
- * Need to consider the following cases for inclusive and
exclusive (lgcf:locality group column family set, cf:column family set) lgcf
and cf are
- * disjoint lgcf and cf are the same cf contains lgcf lgcf
contains cf lgccf and cf intersect but neither is a subset of the other
- */
-
- for (Entry<ByteSequence,MutableLong> entry :
lgr.columnFamilies.entrySet())
- if (entry.getValue().longValue() > 0)
- if (cfSet.contains(entry.getKey())) {
- if (inclusive)
- include = true;
- } else if (!inclusive) {
- include = true;
- }
+ for (ByteSequence cf : cfSet) {
+ LocalityGroup group = groups.groupByCf.get(cf);
+ if (group != null) {
+ groupsToUse.add(group);
+ }
+ }
}
+ }
- if (include) {
- lgr.getIterator().seek(range, EMPTY_CF_SET, false);
- hiter.addSource(lgr.getIterator());
- numLGSeeked++;
- }// every column family is excluded, zero count, or not present
+ for (LocalityGroup lgr : groupsToUse) {
+ lgr.getIterator().seek(range, EMPTY_CF_SET, false);
+ hiter.addSource(lgr.getIterator());
+ numLGSeeked++;
+ }
+
+ if (used != null) {
+ used.addAll(groupsToUse);
}
return numLGSeeked;
}
@Override
public void seek(Range range, Collection<ByteSequence> columnFamilies,
boolean inclusive) throws IOException {
- seek(this, groups, nonDefaultColumnFamilies, range, columnFamilies,
inclusive);
+
+ // determine if the arguments have changed since the last time
+ boolean sameArgs = false;
+ ImmutableSet<ByteSequence> cfSet = null;
+ if (lastUsed != null && inclusive == lastInclusive) {
--- End diff --
I was curious if the RFile unit test would cover these different branches.
So I ran those test with code coverage. None of the code in this function was
touched. I was surprised and dug into it, this function is only used by the
iin memory map. Rfile only calsee the static seek method in this code.
It would be nice to test that seeking the same iterator with different
families and inclusiveness works.
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