@SuppressWarnings("unchecked")
@Override
protected final void completeInitializationOp(Object[] os) throws HiveException {
if (os.length != 0) {
Pair<MapJoinTableContainer[], MapJoinTableContainerSerDe[]> pair =
(Pair<MapJoinTableContainer[], MapJoinTableContainerSerDe[]>) os[0];
boolean spilled = false;
for (MapJoinTableContainer container : pair.getLeft()) {
if (container != null) {
spilled = spilled || container.hasSpill();
}
}
if (!loadCalled && spilled) {
// we can't use the cached table because it has spilled.
loadHashTable(getExecContext(), MapredContext.get());
} else {
// let's use the table from the cache.
mapJoinTables = pair.getLeft();
mapJoinTableSerdes = pair.getRight();
}
hashTblInitedOnce = true;
}
if (this.getExecContext() != null) {
// reset exec context so that initialization of the map operator happens
// properly
this.getExecContext().setLastInputPath(null);
this.getExecContext().setCurrentInputPath(null);
}
}
// Load the hash table
@Override
public void cleanUpInputFileChangedOp() throws HiveException {
loadHashTable(getExecContext(), MapredContext.get());
}
@Override
protected Collection<Future<?>> initializeOp(Configuration hconf) throws HiveException {
this.hconf = hconf;
unwrapContainer = new UnwrapRowContainer[conf.getTagLength()];
Collection<Future<?>> result = super.initializeOp(hconf);
if (result == null) {
result = new HashSet<Future<?>>();
}
int tagLen = conf.getTagLength();
// On Tez only: The hash map might already be cached in the container we run
// the task in. On MR: The cache is a no-op.
cacheKey =
HiveConf.getVar(hconf, HiveConf.ConfVars.HIVEQUERYID)
+ "__HASH_MAP_"
+ this.getOperatorId()
+ "_container";
cache = ObjectCacheFactory.getCache(hconf);
loader = getHashTableLoader(hconf);
hashMapRowGetters = null;
mapJoinTables = new MapJoinTableContainer[tagLen];
mapJoinTableSerdes = new MapJoinTableContainerSerDe[tagLen];
hashTblInitedOnce = false;
generateMapMetaData();
final ExecMapperContext mapContext = getExecContext();
final MapredContext mrContext = MapredContext.get();
if (!conf.isBucketMapJoin() && !conf.isDynamicPartitionHashJoin()) {
/*
* The issue with caching in case of bucket map join is that different tasks
* process different buckets and if the container is reused to join a different bucket,
* join results can be incorrect. The cache is keyed on operator id and for bucket map join
* the operator does not change but data needed is different. For a proper fix, this
* requires changes in the Tez API with regard to finding bucket id and
* also ability to schedule tasks to re-use containers that have cached the specific bucket.
*/
if (isLogInfoEnabled) {
LOG.info("This is not bucket map join, so cache");
}
Future<Pair<MapJoinTableContainer[], MapJoinTableContainerSerDe[]>> future =
cache.retrieveAsync(
cacheKey,
new Callable<Pair<MapJoinTableContainer[], MapJoinTableContainerSerDe[]>>() {
@Override
public Pair<MapJoinTableContainer[], MapJoinTableContainerSerDe[]> call()
throws HiveException {
return loadHashTable(mapContext, mrContext);
}
});
result.add(future);
} else if (!isInputFileChangeSensitive(mapContext)) {
loadHashTable(mapContext, mrContext);
hashTblInitedOnce = true;
}
return result;
}
@Nullable
public static MapredContext get() {
return MapredContext.get();
}