尝试在GAE中写入Cloud Bigtable时出现ClosedChannelException

Question

我正在尝试在我的app引擎servlet中写入cloud bigtable。我从https://github.com/GoogleCloudPlatform/cloud-bigtable-examples/blob/master/java/managed-vm-gae/gae-bigtable-hello/src/main/java/com.example.cloud.bigtable.helloworld/BigtableHelper.java复制了BigTableHelper，在我的servlet中我只做了以下操作。

  public void doGet(HttpServletRequest req, HttpServletResponse resp)
      throws IOException {
    try (Table t = BigtableHelper.getConnection().getTable(BigtableHelper.TEST_TABLE)) {
      Put put = new Put(Bytes.toBytes("row1"));
      put.addColumn(BigtableHelper.RAW_UPDATE_FAMILY, BigtableHelper.RAW_UPDATE_QUALIFIER,
              Bytes.toBytes("testdata"));
      t.put(put);
    } catch (IOException e) {
      log("writeToBigtable", e);
    }
}

put失败了，错误。

java.io.IOException：无法执行操作。在com.google.cloud.bigtable.hbase.BigtableTable.put（BigtableTable.java:288）的操作='put'，projectId ='myprojectid'，tableName ='test_table'，rowKey ='row1'在......

引起：com.google.bigtable.repackaged.com.google.common.util.concurrent.UncheckedExecutionException：io.grpc.StatusRuntimeException：UNKNOWN at io.grpc.stub.Calls.getUnchecked（Calls.java:117）at io。 grpc.stub.Calls.blockingUnaryCall（Calls.java:129）位于com.google.cloud.bigtable.grpc.BigtableGrpcClient.mutateRow（BigtableGrpcClient.java:210）com.google.cloud.bigtable.hbase.BigtableTable.put（ BigtableTable.java:285）......还有32个

引起：io.grpc.StatusRuntimeException：UNKNOWN at io.grpc.Status.asRuntimeException（Status.java:428）at io.grpc.stub.Calls $ UnaryStreamToFuture.onClose（Calls.java:324）at io.grpc.ChannelImpl $ java.util.concurrent.ThreadPoolExecutor.runWorker（ThreadPoolExecutor.java:1145）的java上的$ CallImpl $ ClientStreamListenerImpl $ 3.run（ChannelImpl.java:402） .util.concurrent.ThreadPoolExecutor $ Worker.run（ThreadPoolExecutor.java:615）... 1更多

引起：java.nio.channels.ClosedChannelException

BigtableHelper.getConnection（）没有抛出异常，我假设它成功连接。 put语句有什么问题吗？什么可能导致这个问题？谢谢！

Answer 1

我们更新了使用Java 8从Google App Engine Flex和Standard与Cloud Bigtable进行交互的示例：

• https://github.com/googlecloudplatform/java-docs-samples/tree/master/appengine-java8/bigtable
• https://github.com/GoogleCloudPlatform/cloud-bigtable-examples/tree/master/java/gae-flexible-helloworld