org.apache.hadoop.hbase.ipc.BlockingRpcCallback Java Examples

@Override
public MetaDataMutationResult updateIndexState(final List<Mutation> tableMetaData, String parentTableName) throws SQLException {
    byte[][] rowKeyMetadata = new byte[3][];
    SchemaUtil.getVarChars(tableMetaData.get(0).getRow(), rowKeyMetadata);
    byte[] tableKey = SchemaUtil.getTableKey(ByteUtil.EMPTY_BYTE_ARRAY, rowKeyMetadata[PhoenixDatabaseMetaData.SCHEMA_NAME_INDEX], rowKeyMetadata[PhoenixDatabaseMetaData.TABLE_NAME_INDEX]);
    return metaDataCoprocessorExec(tableKey,
            new Batch.Call<MetaDataService, MetaDataResponse>() {
                @Override
                public MetaDataResponse call(MetaDataService instance) throws IOException {
                    ServerRpcController controller = new ServerRpcController();
                    BlockingRpcCallback<MetaDataResponse> rpcCallback =
                            new BlockingRpcCallback<MetaDataResponse>();
                    UpdateIndexStateRequest.Builder builder = UpdateIndexStateRequest.newBuilder();
                    for (Mutation m : tableMetaData) {
                        MutationProto mp = ProtobufUtil.toProto(m);
                        builder.addTableMetadataMutations(mp.toByteString());
                    }
                    instance.updateIndexState(controller, builder.build(), rpcCallback);
                    if(controller.getFailedOn() != null) {
                        throw controller.getFailedOn();
                    }
                    return rpcCallback.get();
                }
            });
}
 

public static void clearMetaDataCache(Connection conn) throws Throwable {
    PhoenixConnection pconn = conn.unwrap(PhoenixConnection.class);
    HTableInterface htable = pconn.getQueryServices().getTable(PhoenixDatabaseMetaData.SYSTEM_CATALOG_NAME_BYTES);
    htable.coprocessorService(MetaDataService.class, HConstants.EMPTY_START_ROW,
        HConstants.EMPTY_END_ROW, new Batch.Call<MetaDataService, ClearCacheResponse>() {
            @Override
            public ClearCacheResponse call(MetaDataService instance) throws IOException {
                ServerRpcController controller = new ServerRpcController();
                BlockingRpcCallback<ClearCacheResponse> rpcCallback =
                        new BlockingRpcCallback<ClearCacheResponse>();
                ClearCacheRequest.Builder builder = ClearCacheRequest.newBuilder();
                instance.clearCache(controller, builder.build(), rpcCallback);
                if(controller.getFailedOn() != null) {
                    throw controller.getFailedOn();
                }
                return rpcCallback.get(); 
            }
          });
}
 

@Override
public AuthenticationProtos.GetAuthenticationTokenResponse getAuthenticationToken(
    RpcController controller, AuthenticationProtos.GetAuthenticationTokenRequest request)
  throws ServiceException {
  LOG.debug("Authentication token request from " + RpcServer.getRequestUserName().orElse(null));
  // Ignore above passed in controller -- it is always null
  ServerRpcController serverController = new ServerRpcController();
  final BlockingRpcCallback<AuthenticationProtos.GetAuthenticationTokenResponse>
    callback = new BlockingRpcCallback<>();
  getAuthenticationToken(null, request, callback);
  try {
    serverController.checkFailed();
    return callback.get();
  } catch (IOException ioe) {
    throw new ServiceException(ioe);
  }
}
 

@Override
public AuthenticationProtos.WhoAmIResponse whoAmI(
    RpcController controller, AuthenticationProtos.WhoAmIRequest request)
  throws ServiceException {
  LOG.debug("whoAmI() request from " + RpcServer.getRequestUserName().orElse(null));
  // Ignore above passed in controller -- it is always null
  ServerRpcController serverController = new ServerRpcController();
  BlockingRpcCallback<AuthenticationProtos.WhoAmIResponse> callback =
      new BlockingRpcCallback<>();
  whoAmI(null, request, callback);
  try {
    serverController.checkFailed();
    return callback.get();
  } catch (IOException ioe) {
    throw new ServiceException(ioe);
  }
}
 

private Iterator<List<IIProtos.IIResponse.IIRow>> getResults(final IIProtos.IIRequest request, HTableInterface table) throws Throwable {
    Map<byte[], List<IIProtos.IIResponse.IIRow>> results = table.coprocessorService(IIProtos.RowsService.class, null, null, new Batch.Call<IIProtos.RowsService, List<IIProtos.IIResponse.IIRow>>() {
        public List<IIProtos.IIResponse.IIRow> call(IIProtos.RowsService rowsService) throws IOException {
            ServerRpcController controller = new ServerRpcController();
            BlockingRpcCallback<IIProtos.IIResponse> rpcCallback = new BlockingRpcCallback<>();
            rowsService.getRows(controller, request, rpcCallback);
            IIProtos.IIResponse response = rpcCallback.get();
            if (controller.failedOnException()) {
                throw controller.getFailedOn();
            }

            return response.getRowsList();
        }
    });

    return results.values().iterator();
}
 

@Override
public MetaDataMutationResult getTable(final PName tenantId, final byte[] schemaBytes, final byte[] tableBytes,
        final long tableTimestamp, final long clientTimestamp) throws SQLException {
    final byte[] tenantIdBytes = tenantId == null ? ByteUtil.EMPTY_BYTE_ARRAY : tenantId.getBytes();
    byte[] tableKey = SchemaUtil.getTableKey(tenantIdBytes, schemaBytes, tableBytes);
    return metaDataCoprocessorExec(tableKey,
        new Batch.Call<MetaDataService, MetaDataResponse>() {
            @Override
            public MetaDataResponse call(MetaDataService instance) throws IOException {
                ServerRpcController controller = new ServerRpcController();
                BlockingRpcCallback<MetaDataResponse> rpcCallback =
                        new BlockingRpcCallback<MetaDataResponse>();
                GetTableRequest.Builder builder = GetTableRequest.newBuilder();
                builder.setTenantId(HBaseZeroCopyByteString.wrap(tenantIdBytes));
                builder.setSchemaName(HBaseZeroCopyByteString.wrap(schemaBytes));
                builder.setTableName(HBaseZeroCopyByteString.wrap(tableBytes));
                builder.setTableTimestamp(tableTimestamp);
                builder.setClientTimestamp(clientTimestamp);

               instance.getTable(controller, builder.build(), rpcCallback);
               if(controller.getFailedOn() != null) {
                   throw controller.getFailedOn();
               }
               return rpcCallback.get();
            }
        });
}
 

public static List<DataProtos.DataQueryResponse.Row> queryByStartRowAndStopRow(String tableName, String startRow, String stopRow, boolean isIncludeEnd, boolean isSalting) {

        final DataProtos.DataQueryRequest.Builder requestBuilder = DataProtos.DataQueryRequest.newBuilder();
        requestBuilder.setTableName(tableName);
        requestBuilder.setStartRow(startRow);
        requestBuilder.setEndRow(stopRow);
        requestBuilder.setIncluedEnd(isIncludeEnd);
        requestBuilder.setIsSalting(isSalting);
        try {
            HTable table = new HTable(HBaseConfiguration.create(conf), tableName);
            Map<byte[], List<DataProtos.DataQueryResponse.Row>> result = table.coprocessorService(DataProtos.QueryDataService.class, null, null, new Batch.Call<DataProtos.QueryDataService, List<DataProtos.DataQueryResponse.Row>>() {
                public List<DataProtos.DataQueryResponse.Row> call(DataProtos.QueryDataService counter) throws IOException {
                    ServerRpcController controller = new ServerRpcController();
                    BlockingRpcCallback<DataProtos.DataQueryResponse> rpcCallback = new BlockingRpcCallback<>();
                    counter.queryByStartRowAndEndRow(controller, requestBuilder.build(), rpcCallback);
                    DataProtos.DataQueryResponse response = rpcCallback.get();
                    if (controller.failedOnException()) {
                        throw controller.getFailedOn();
                    }
                    return response.getRowListList();
                }
            });
            List<DataProtos.DataQueryResponse.Row> results = new LinkedList<>();
            result.entrySet()
                    .stream()
                    .filter(entry -> null != entry.getValue())
                    .forEach(entry -> results.addAll(entry.getValue()));
            return results;
        } catch (Throwable e) {
            throw new RuntimeException(e);
        }
    }
 

@Override
	public AggregateResult aggregate(final HTableInterface table,
	                                       final EntityDefinition entityDefinition,
	                                       final Scan scan,
	                                       final List<String> groupbyFields,
	                                       final List<AggregateFunctionType> aggregateFuncTypes,
	                                       final List<String> aggregatedFields,
	                                       final boolean timeSeries,
	                                       final long startTime,
	                                       final long endTime,
	                                       final long intervalMin) throws IOException {
		checkNotNull(entityDefinition,"entityDefinition");
		final List<AggregateFunctionType> _aggregateFuncTypes = convertToCoprocessorAggregateFunc(aggregateFuncTypes);
		final List<byte[]> _aggregateFuncTypesBytes = AggregateFunctionType.toBytesList(_aggregateFuncTypes);
//		if(timeSeries) TimeSeriesAggregator.validateTimeRange(startTime,endTime,intervalMin);
		callback = new AggregateResultCallbackImpl(aggregateFuncTypes);
		try{
			if(!LOG.isDebugEnabled()){
				LOG.info("Going to exec coprocessor: "+AggregateProtocol.class.getSimpleName());
			}else{
				LOG.debug("Going to exec coprocessor: "+AggregateProtocol.class.getName());
			}

//			table.coprocessorExec(AggregateProtocol.class,scan.getStartRow(),scan.getStopRow(),new Batch.Call<AggregateProtocol, AggregateResult>(){
//				@Override
//				public AggregateResult call(AggregateProtocol instance) throws IOException {
//					if(timeSeries){
//						return instance.aggregate(entityDefinition, scan, groupbyFields, _aggregateFuncTypesBytes, aggregatedFields,startTime,endTime,intervalMin);
//					}else{
//						return instance.aggregate(entityDefinition, scan, groupbyFields, _aggregateFuncTypesBytes, aggregatedFields);
//					}
//				}
//			},callback);

          table.coprocessorService(AggregateProtos.AggregateProtocol.class, scan.getStartRow(), scan.getStopRow(), new Batch.Call<AggregateProtos.AggregateProtocol, AggregateProtos.AggregateResult>() {
              @Override
              public AggregateProtos.AggregateResult call(AggregateProtos.AggregateProtocol instance) throws IOException {
                  BlockingRpcCallback<AggregateProtos.AggregateResult> rpcCallback = new BlockingRpcCallback<AggregateProtos.AggregateResult>();
                  if(timeSeries){
                      AggregateProtos.TimeSeriesAggregateRequest timeSeriesAggregateRequest = ProtoBufConverter
                              .toPBTimeSeriesRequest(
                                      entityDefinition,
                                      scan,
                                      groupbyFields,
                                      _aggregateFuncTypesBytes,
                                      aggregatedFields,
                                      startTime,
                                      endTime,
                                      intervalMin);
                      instance.timeseriesAggregate(null, timeSeriesAggregateRequest, rpcCallback);
                      return rpcCallback.get();
					}else{
                      AggregateProtos.AggregateRequest aggregateRequest = ProtoBufConverter.toPBRequest(
                                      entityDefinition, scan, groupbyFields, _aggregateFuncTypesBytes, aggregatedFields);
                      instance.aggregate(null, aggregateRequest, rpcCallback);
                      return rpcCallback.get();
					}
              }
          }, callback);
		} catch (Throwable t){
			LOG.error(t.getMessage(),t);
			throw new IOException(t);
		}
		return callback.result();
	}
 

@Override
public AggregateResult aggregate(final HTableInterface table,
                                 final EntityDefinition entityDefinition,
                                 final Scan scan,
                                 final List<String> groupbyFields,
                                 final List<AggregateFunctionType> aggregateFuncTypes,
                                 final List<String> aggregatedFields,
                                 final boolean timeSeries,
                                 final long startTime,
                                 final long endTime,
                                 final long intervalMin) throws IOException {
    checkNotNull(entityDefinition, "entityDefinition");
    final List<AggregateFunctionType> _aggregateFuncTypes = convertToCoprocessorAggregateFunc(aggregateFuncTypes);
    final List<byte[]> _aggregateFuncTypesBytes = AggregateFunctionType.toBytesList(_aggregateFuncTypes);
    // if(timeSeries) TimeSeriesAggregator.validateTimeRange(startTime,endTime,intervalMin);
    callback = new AggregateResultCallbackImpl(aggregateFuncTypes);
    try {
        if (!LOG.isDebugEnabled()) {
            LOG.info("Going to exec coprocessor: " + AggregateProtocol.class.getSimpleName());
        } else {
            LOG.debug("Going to exec coprocessor: " + AggregateProtocol.class.getName());
        }

        //  table.coprocessorExec(AggregateProtocol.class,scan.getStartRow(),scan.getStopRow(),new Batch.Call<AggregateProtocol, AggregateResult>(){
        //  @Override
        //  public AggregateResult call(AggregateProtocol instance) throws IOException {
        //      if(timeSeries){
        //   return instance.aggregate(entityDefinition, scan, groupbyFields, _aggregateFuncTypesBytes, aggregatedFields,startTime,endTime,intervalMin);
        //      }else{
        //   return instance.aggregate(entityDefinition, scan, groupbyFields, _aggregateFuncTypesBytes, aggregatedFields);
        //      }
        //  }
        //  },callback);

        table.coprocessorService(AggregateProtos.AggregateProtocol.class,
            scan.getStartRow(), scan.getStopRow(), new Batch.Call<AggregateProtos.AggregateProtocol, AggregateProtos.AggregateResult>() {
                @Override
                public AggregateProtos.AggregateResult call(AggregateProtos.AggregateProtocol instance) throws IOException {
                    BlockingRpcCallback<AggregateProtos.AggregateResult> rpcCallback = new BlockingRpcCallback<>();
                    if (timeSeries) {
                        AggregateProtos.TimeSeriesAggregateRequest timeSeriesAggregateRequest = ProtoBufConverter
                                .toPBTimeSeriesRequest(
                                        entityDefinition,
                                        scan,
                                        groupbyFields,
                                        _aggregateFuncTypesBytes,
                                        aggregatedFields,
                                        startTime,
                                        endTime,
                                        intervalMin);
                        instance.timeseriesAggregate(null, timeSeriesAggregateRequest, rpcCallback);
                        return rpcCallback.get();
                    } else {
                        AggregateProtos.AggregateRequest aggregateRequest = ProtoBufConverter.toPBRequest(
                                entityDefinition, scan, groupbyFields, _aggregateFuncTypesBytes, aggregatedFields);
                        instance.aggregate(null, aggregateRequest, rpcCallback);
                        return rpcCallback.get();
                    }
                }
            }, callback);
    } catch (Throwable t) {
        LOG.error(t.getMessage(), t);
        throw new IOException(t);
    }
    return callback.result();
}
 

private void checkClientServerCompatibility() throws SQLException {
    StringBuilder buf = new StringBuilder("The following servers require an updated " + QueryConstants.DEFAULT_COPROCESS_PATH + " to be put in the classpath of HBase: ");
    boolean isIncompatible = false;
    int minHBaseVersion = Integer.MAX_VALUE;
    try {
        List<HRegionLocation> locations = this.getAllTableRegions(SYSTEM_CATALOG_NAME_BYTES);
        Set<HRegionLocation> serverMap = Sets.newHashSetWithExpectedSize(locations.size());
        TreeMap<byte[], HRegionLocation> regionMap = Maps.newTreeMap(Bytes.BYTES_COMPARATOR);
        List<byte[]> regionKeys = Lists.newArrayListWithExpectedSize(locations.size());
        for (HRegionLocation entry : locations) {
            if (!serverMap.contains(entry)) {
                regionKeys.add(entry.getRegionInfo().getStartKey());
                regionMap.put(entry.getRegionInfo().getRegionName(), entry);
                serverMap.add(entry);
            }
        }

        HTableInterface ht = this.getTable(PhoenixDatabaseMetaData.SYSTEM_CATALOG_NAME_BYTES);
        final Map<byte[], Long> results =
                ht.coprocessorService(MetaDataService.class, null, null, new Batch.Call<MetaDataService,Long>() {
                    @Override
                    public Long call(MetaDataService instance) throws IOException {
                        ServerRpcController controller = new ServerRpcController();
                        BlockingRpcCallback<GetVersionResponse> rpcCallback =
                                new BlockingRpcCallback<GetVersionResponse>();
                        GetVersionRequest.Builder builder = GetVersionRequest.newBuilder();

                        instance.getVersion(controller, builder.build(), rpcCallback);
                        if(controller.getFailedOn() != null) {
                            throw controller.getFailedOn();
                        }
                        return rpcCallback.get().getVersion();
                    }
                });
        for (Map.Entry<byte[],Long> result : results.entrySet()) {
            // This is the "phoenix.jar" is in-place, but server is out-of-sync with client case.
            if (!isCompatible(result.getValue())) {
                isIncompatible = true;
                HRegionLocation name = regionMap.get(result.getKey());
                buf.append(name);
                buf.append(';');
            }
            hasInvalidIndexConfiguration |= isInvalidMutableIndexConfig(result.getValue());
            if (minHBaseVersion > MetaDataUtil.decodeHBaseVersion(result.getValue())) {
                minHBaseVersion = MetaDataUtil.decodeHBaseVersion(result.getValue());
            }
        }
        lowestClusterHBaseVersion = minHBaseVersion;
    } catch (SQLException e) {
        throw e;
    } catch (Throwable t) {
        // This is the case if the "phoenix.jar" is not on the classpath of HBase on the region server
        throw new SQLExceptionInfo.Builder(SQLExceptionCode.INCOMPATIBLE_CLIENT_SERVER_JAR).setRootCause(t)
            .setMessage("Ensure that " + QueryConstants.DEFAULT_COPROCESS_PATH + " is put on the classpath of HBase in every region server: " + t.getMessage())
            .build().buildException();
    }
    if (isIncompatible) {
        buf.setLength(buf.length()-1);
        throw new SQLExceptionInfo.Builder(SQLExceptionCode.OUTDATED_JARS).setMessage(buf.toString()).build().buildException();
    }
}
 

@Override
public MetaDataMutationResult dropTable(final List<Mutation> tableMetaData, final PTableType tableType, final boolean cascade) throws SQLException {
    byte[][] rowKeyMetadata = new byte[3][];
    SchemaUtil.getVarChars(tableMetaData.get(0).getRow(), rowKeyMetadata);
    byte[] tenantIdBytes = rowKeyMetadata[PhoenixDatabaseMetaData.TENANT_ID_INDEX];
    byte[] schemaBytes = rowKeyMetadata[PhoenixDatabaseMetaData.SCHEMA_NAME_INDEX];
    byte[] tableBytes = rowKeyMetadata[PhoenixDatabaseMetaData.TABLE_NAME_INDEX];
    byte[] tableKey = SchemaUtil.getTableKey(tenantIdBytes == null ? ByteUtil.EMPTY_BYTE_ARRAY : tenantIdBytes, schemaBytes, tableBytes);
    final MetaDataMutationResult result =  metaDataCoprocessorExec(tableKey,
            new Batch.Call<MetaDataService, MetaDataResponse>() {
                @Override
                public MetaDataResponse call(MetaDataService instance) throws IOException {
                    ServerRpcController controller = new ServerRpcController();
                    BlockingRpcCallback<MetaDataResponse> rpcCallback =
                            new BlockingRpcCallback<MetaDataResponse>();
                    DropTableRequest.Builder builder = DropTableRequest.newBuilder();
                    for (Mutation m : tableMetaData) {
                        MutationProto mp = ProtobufUtil.toProto(m);
                        builder.addTableMetadataMutations(mp.toByteString());
                    }
                    builder.setTableType(tableType.getSerializedValue());
                    builder.setCascade(cascade);

                    instance.dropTable(controller, builder.build(), rpcCallback);
                    if(controller.getFailedOn() != null) {
                        throw controller.getFailedOn();
                    }
                    return rpcCallback.get();
                }
            });

    final MutationCode code = result.getMutationCode();
    switch(code) {
    case TABLE_ALREADY_EXISTS:
        ReadOnlyProps props = this.getProps();
        boolean dropMetadata = props.getBoolean(DROP_METADATA_ATTRIB, DEFAULT_DROP_METADATA);
        if (dropMetadata) {
            dropTables(result.getTableNamesToDelete());
        }
        invalidateTables(result.getTableNamesToDelete());
        if (tableType == PTableType.TABLE) {
            byte[] physicalName = SchemaUtil.getTableNameAsBytes(schemaBytes, tableBytes);
            long timestamp = MetaDataUtil.getClientTimeStamp(tableMetaData);
            ensureViewIndexTableDropped(physicalName, timestamp);
            ensureLocalIndexTableDropped(physicalName, timestamp);
            tableStatsCache.invalidate(new ImmutableBytesPtr(physicalName));
        }
        break;
    default:
        break;
    }
      return result;
}
 

@Override
public MetaDataMutationResult dropColumn(final List<Mutation> tableMetaData, PTableType tableType) throws SQLException {
    byte[][] rowKeyMetadata = new byte[3][];
    SchemaUtil.getVarChars(tableMetaData.get(0).getRow(), rowKeyMetadata);
    byte[] tenantIdBytes = rowKeyMetadata[PhoenixDatabaseMetaData.TENANT_ID_INDEX];
    byte[] schemaBytes = rowKeyMetadata[PhoenixDatabaseMetaData.SCHEMA_NAME_INDEX];
    byte[] tableBytes = rowKeyMetadata[PhoenixDatabaseMetaData.TABLE_NAME_INDEX];
    byte[] tableKey = SchemaUtil.getTableKey(tenantIdBytes, schemaBytes, tableBytes);
    MetaDataMutationResult result = metaDataCoprocessorExec(tableKey,
        new Batch.Call<MetaDataService, MetaDataResponse>() {
            @Override
            public MetaDataResponse call(MetaDataService instance) throws IOException {
                ServerRpcController controller = new ServerRpcController();
                BlockingRpcCallback<MetaDataResponse> rpcCallback =
                        new BlockingRpcCallback<MetaDataResponse>();
                DropColumnRequest.Builder builder = DropColumnRequest.newBuilder();
                for (Mutation m : tableMetaData) {
                    MutationProto mp = ProtobufUtil.toProto(m);
                    builder.addTableMetadataMutations(mp.toByteString());
                }
                instance.dropColumn(controller, builder.build(), rpcCallback);
                if(controller.getFailedOn() != null) {
                    throw controller.getFailedOn();
                }
                return rpcCallback.get();
            }
        });
    final MutationCode code = result.getMutationCode();
    switch(code) {
    case TABLE_ALREADY_EXISTS:
        final ReadOnlyProps props = this.getProps();
        final boolean dropMetadata = props.getBoolean(DROP_METADATA_ATTRIB, DEFAULT_DROP_METADATA);
        if (dropMetadata) {
            dropTables(result.getTableNamesToDelete());
        }
        invalidateTables(result.getTableNamesToDelete());
        break;
    default:
        break;
    }
    return result;

}
 

/**
 * Remove the cached table from all region servers
 * @param cacheId unique identifier for the hash join (returned from {@link #addHashCache(HTable, Scan, Set)})
 * @param servers list of servers upon which table was cached (filled in by {@link #addHashCache(HTable, Scan, Set)})
 * @throws SQLException
 * @throws IllegalStateException if hashed table cannot be removed on any region server on which it was added
 */
private void removeServerCache(final byte[] cacheId, Set<HRegionLocation> servers) throws SQLException {
	ConnectionQueryServices services = connection.getQueryServices();
	Throwable lastThrowable = null;
	TableRef cacheUsingTableRef = cacheUsingTableRefMap.get(Bytes.mapKey(cacheId));
	byte[] tableName = cacheUsingTableRef.getTable().getPhysicalName().getBytes();
	HTableInterface iterateOverTable = services.getTable(tableName);
	try {
		List<HRegionLocation> locations = services.getAllTableRegions(tableName);
		Set<HRegionLocation> remainingOnServers = new HashSet<HRegionLocation>(servers);
		/**
		 * Allow for the possibility that the region we based where to send our cache has split and been
		 * relocated to another region server *after* we sent it, but before we removed it. To accommodate
		 * this, we iterate through the current metadata boundaries and remove the cache once for each
		 * server that we originally sent to.
		 */
		if (LOG.isDebugEnabled()) {LOG.debug(addCustomAnnotations("Removing Cache " + cacheId + " from servers.", connection));}
		for (HRegionLocation entry : locations) {
			if (remainingOnServers.contains(entry)) {  // Call once per server
				try {
					byte[] key = entry.getRegionInfo().getStartKey();
					iterateOverTable.coprocessorService(ServerCachingService.class, key, key, 
							new Batch.Call<ServerCachingService, RemoveServerCacheResponse>() {
						@Override
						public RemoveServerCacheResponse call(ServerCachingService instance) throws IOException {
							ServerRpcController controller = new ServerRpcController();
							BlockingRpcCallback<RemoveServerCacheResponse> rpcCallback =
									new BlockingRpcCallback<RemoveServerCacheResponse>();
							RemoveServerCacheRequest.Builder builder = RemoveServerCacheRequest.newBuilder();
							if(connection.getTenantId() != null){
								builder.setTenantId(HBaseZeroCopyByteString.wrap(connection.getTenantId().getBytes()));
							}
							builder.setCacheId(HBaseZeroCopyByteString.wrap(cacheId));
							instance.removeServerCache(controller, builder.build(), rpcCallback);
							if(controller.getFailedOn() != null) {
								throw controller.getFailedOn();
							}
							return rpcCallback.get(); 
						}
					});
					remainingOnServers.remove(entry);
				} catch (Throwable t) {
					lastThrowable = t;
					LOG.error(addCustomAnnotations("Error trying to remove hash cache for " + entry, connection), t);
				}
			}
		}
		if (!remainingOnServers.isEmpty()) {
			LOG.warn(addCustomAnnotations("Unable to remove hash cache for " + remainingOnServers, connection), lastThrowable);
		}
	} finally {
		Closeables.closeQuietly(iterateOverTable);
	}
}
 

private ScanResponse scan(ScanRequest req) throws IOException {
  BlockingRpcCallback<ScanResponse> callback = new BlockingRpcCallback<>();
  STUB.scan(new HBaseRpcControllerImpl(), req, callback);
  return callback.get();
}
 

private ScanResponse scan(HBaseRpcController hrc, ScanRequest req) throws IOException {
  BlockingRpcCallback<ScanResponse> callback = new BlockingRpcCallback<>();
  STUB.scan(hrc, req, callback);
  return callback.get();
}
 

@Override
public String getVersion() {
  String version = null;

  if ((options == null) || !options.isServerSideLibraryEnabled()) {
    LOGGER.warn("Serverside library not enabled, serverside version is irrelevant");
    return null;
  }
  try {
    // use Index as the type to check for version (for hbase type
    // doesn't matter anyways)
    final MetadataType type = MetadataType.INDEX;
    final String tableName = getMetadataTableName(type);
    if (!indexExists(tableName)) {
      createTable(
          new byte[0][],
          HBaseOperations.METADATA_CFS_VERSIONING,
          StringColumnFamilyFactory.getSingletonInstance(),
          getTableName(getQualifiedTableName(tableName)));
    }

    // Use the row count coprocessor
    if (options.isVerifyCoprocessors()) {
      verifyCoprocessor(
          tableName,
          "org.locationtech.geowave.datastore.hbase.coprocessors.VersionEndpoint",
          options.getCoprocessorJar());
    }
    final Table table = getTable(tableName);
    final Map<byte[], List<String>> versionInfoResponse =
        table.coprocessorService(
            VersionProtosClient.VersionService.class,
            null,
            null,
            new Batch.Call<VersionProtosClient.VersionService, List<String>>() {
              @Override
              public List<String> call(final VersionProtosClient.VersionService versionService)
                  throws IOException {
                final BlockingRpcCallback<VersionProtosClient.VersionResponse> rpcCallback =
                    new BlockingRpcCallback<>();
                versionService.version(null, VersionRequest.getDefaultInstance(), rpcCallback);
                final VersionProtosClient.VersionResponse response = rpcCallback.get();
                return response.getVersionInfoList();
              }
            });
    table.close();
    if ((versionInfoResponse == null) || versionInfoResponse.isEmpty()) {
      LOGGER.error("No response from version coprocessor");
    } else {
      final Iterator<List<String>> values = versionInfoResponse.values().iterator();

      final List<String> value = values.next();
      while (values.hasNext()) {
        final List<String> newValue = values.next();
        if (!value.equals(newValue)) {
          LOGGER.error(
              "Version Info '"
                  + Arrays.toString(value.toArray())
                  + "' and '"
                  + Arrays.toString(newValue.toArray())
                  + "' differ.  This may mean that different regions are using different versions of GeoWave.");
        }
      }
      version = VersionUtils.asLineDelimitedString(value);
    }
  } catch (final Throwable e) {
    LOGGER.warn("Unable to check metadata table for version", e);
  }
  return version;
}