Examples with CacheEvictionStatsAggregator org.apache.hadoop.hbase.CacheEvictionStatsAggregator used on opensource projects

Example 1 with CacheEvictionStatsAggregator

use of org.apache.hadoop.hbase.CacheEvictionStatsAggregator in project hbase by apache.

the class RawAsyncHBaseAdmin method clearBlockCache.

@Override
public CompletableFuture<CacheEvictionStats> clearBlockCache(TableName tableName) {
    CompletableFuture<CacheEvictionStats> future = new CompletableFuture<>();
    addListener(getTableHRegionLocations(tableName), (locations, err) -> {
        if (err != null) {
            future.completeExceptionally(err);
            return;
        }
        Map<ServerName, List<RegionInfo>> regionInfoByServerName = locations.stream().filter(l -> l.getRegion() != null).filter(l -> !l.getRegion().isOffline()).filter(l -> l.getServerName() != null).collect(Collectors.groupingBy(l -> l.getServerName(), Collectors.mapping(l -> l.getRegion(), Collectors.toList())));
        List<CompletableFuture<CacheEvictionStats>> futures = new ArrayList<>();
        CacheEvictionStatsAggregator aggregator = new CacheEvictionStatsAggregator();
        for (Map.Entry<ServerName, List<RegionInfo>> entry : regionInfoByServerName.entrySet()) {
            futures.add(clearBlockCache(entry.getKey(), entry.getValue()).whenComplete((stats, err2) -> {
                if (err2 != null) {
                    future.completeExceptionally(unwrapCompletionException(err2));
                } else {
                    aggregator.append(stats);
                }
            }));
        }
        addListener(CompletableFuture.allOf(futures.toArray(new CompletableFuture[futures.size()])), (ret, err3) -> {
            if (err3 != null) {
                future.completeExceptionally(unwrapCompletionException(err3));
            } else {
                future.complete(aggregator.sum());
            }
        });
    });
    return future;
}