How to use

invalidate

method

in

org.apache.carbondata.core.cache.Cache

/**
 * This method will remove the cache for a given key
 *
 * @param keys
 */
public void invalidateAll(List<K> keys) {
 for (K key : keys) {
  cache.invalidate(key);
 }
}

@Override
public void clear(Segment segment) {
 Set<String> shards = segmentMap.remove(segment.getSegmentNo());
 if (shards != null) {
  for (String shard : shards) {
   for (CarbonColumn carbonColumn : dataMapMeta.getIndexedColumns()) {
    cache.invalidate(new BloomCacheKeyValue.CacheKey(shard, carbonColumn.getColName()));
   }
  }
 }
}

 /**
  * This method will remove dictionary cache from driver for both reverse and forward dictionary
  *
  * @param carbonTableIdentifier
  * @param columnId
  */
 public static void removeDictionaryColumnFromCache(AbsoluteTableIdentifier carbonTableIdentifier,
   String columnId) {
  Cache<DictionaryColumnUniqueIdentifier, Dictionary> dictCache =
    CacheProvider.getInstance().createCache(CacheType.REVERSE_DICTIONARY);
  DictionaryColumnUniqueIdentifier dictionaryColumnUniqueIdentifier =
    new DictionaryColumnUniqueIdentifier(carbonTableIdentifier,
      new ColumnIdentifier(columnId, null, null));
  dictCache.invalidate(dictionaryColumnUniqueIdentifier);
  dictCache = CacheProvider.getInstance().createCache(CacheType.FORWARD_DICTIONARY);
  dictCache.invalidate(dictionaryColumnUniqueIdentifier);
 }
}

@Override
public void clear(Segment segment) {
 Set<TableBlockIndexUniqueIdentifier> blockIndexes = segmentMap.remove(segment.getSegmentNo());
 if (blockIndexes != null) {
  for (TableBlockIndexUniqueIdentifier blockIndex : blockIndexes) {
   TableBlockIndexUniqueIdentifierWrapper blockIndexWrapper =
     new TableBlockIndexUniqueIdentifierWrapper(blockIndex, this.getCarbonTable());
   BlockletDataMapIndexWrapper wrapper = cache.getIfPresent(blockIndexWrapper);
   if (null != wrapper) {
    List<BlockDataMap> dataMaps = wrapper.getDataMaps();
    for (DataMap dataMap : dataMaps) {
     if (dataMap != null) {
      cache.invalidate(blockIndexWrapper);
      dataMap.clear();
     }
    }
   }
  }
 }
}