/**
* Drops the partition from its HdfsTable. If the HdfsTable does not exist, an exception is
* thrown. If the partition having the given partition spec does not exist, null is returned.
* Otherwise, the table with an updated catalog version is returned.
*/
public Table dropPartition(TableName tableName, List<TPartitionKeyValue> partitionSpec)
throws CatalogException {
Preconditions.checkNotNull(partitionSpec);
Table tbl = getOrLoadTable(tableName.getDb(), tableName.getTbl());
if (tbl == null) {
throw new TableNotFoundException("Table not found: " + tbl.getFullName());
}
if (!(tbl instanceof HdfsTable)) {
throw new CatalogException("Table " + tbl.getFullName() + " is not an Hdfs table");
}
HdfsTable hdfsTable = (HdfsTable) tbl;
// Locking the catalog here because this accesses hdfsTable's partition list and
// updates its catalog version.
// TODO: Fix this locking pattern.
catalogLock_.writeLock().lock();
try {
HdfsPartition hdfsPartition = hdfsTable.dropPartition(partitionSpec);
if (hdfsPartition == null) return null;
return replaceTableIfUnchanged(hdfsTable, hdfsTable.getCatalogVersion());
} finally {
catalogLock_.writeLock().unlock();
}
}
