Github user joshelser commented on a diff in the pull request:
https://github.com/apache/accumulo/pull/275#discussion_r127019184
--- 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) {
+ if (columnFamilies instanceof Set) {
+ sameArgs = lastColumnFamilies.equals(columnFamilies);
+ } else {
+ cfSet = ImmutableSet.copyOf(columnFamilies);
+ sameArgs = lastColumnFamilies.equals(cfSet);
--- End diff --
`sameArgs` is essentially computed the same way in both branches. Could
pull it out.
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