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https://issues.apache.org/jira/browse/BEAM-8376?focusedWorklogId=354283&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-354283
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ASF GitHub Bot logged work on BEAM-8376:
----------------------------------------

                Author: ASF GitHub Bot
            Created on: 05/Dec/19 13:09
            Start Date: 05/Dec/19 13:09
    Worklog Time Spent: 10m 
      Work Description: djelekar commented on pull request #10187: [BEAM-8376] 
Initial version of firestore connector JavaSDK
URL: https://github.com/apache/beam/pull/10187#discussion_r354302144
 
 

 ##########
 File path: 
sdks/java/io/google-cloud-platform/src/main/java/org/apache/beam/sdk/io/gcp/firestore/FirestoreWriterFn.java
 ##########
 @@ -0,0 +1,203 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.beam.sdk.io.gcp.firestore;
+
+import com.google.api.core.ApiFuture;
+import com.google.cloud.firestore.Firestore;
+import com.google.cloud.firestore.FirestoreException;
+import com.google.cloud.firestore.FirestoreOptions;
+import com.google.cloud.firestore.WriteResult;
+import com.google.rpc.Code;
+import org.apache.beam.sdk.metrics.Counter;
+import org.apache.beam.sdk.metrics.Metrics;
+import org.apache.beam.sdk.transforms.DoFn;
+import org.apache.beam.sdk.transforms.display.DisplayData;
+import org.apache.beam.sdk.util.BackOff;
+import org.apache.beam.sdk.util.BackOffUtils;
+import org.apache.beam.sdk.util.FluentBackoff;
+import org.apache.beam.sdk.util.Sleeper;
+import 
org.apache.beam.vendor.guava.v26_0_jre.com.google.common.collect.ImmutableSet;
+import org.joda.time.Duration;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Set;
+import java.util.concurrent.ExecutionException;
+
+public class FirestoreWriterFn<T> extends DoFn<T, Void> {
+
+    private static final Set<Integer> NON_RETRYABLE_ERRORS =
+            ImmutableSet.of(
+                    Code.FAILED_PRECONDITION.getNumber(),
+                    Code.INVALID_ARGUMENT.getNumber(),
+                    Code.PERMISSION_DENIED.getNumber(),
+                    Code.UNAUTHENTICATED.getNumber());
+    private static final Logger LOG = 
LoggerFactory.getLogger(FirestoreWriterFn.class);
+
+    // Current batch of mutations to be written.
+    private final List<T> mutations = new ArrayList<T>();
+    private int mutationsSize = 0; // Accumulated size of protos in mutations.
+    private WriteBatcher writeBatcher;
+    private transient AdaptiveThrottler throttler;
+    private final Counter throttledSeconds =
+            Metrics.counter(FirestoreWriterFn.class, 
"cumulativeThrottlingSeconds");
+    private final Counter rpcErrors =
+            Metrics.counter(FirestoreWriterFn.class, "firestoreRpcErrors");
+    private final Counter rpcSuccesses =
+            Metrics.counter(FirestoreWriterFn.class, "firestoreRpcSuccesses");
+
+    private static final int MAX_RETRIES = 5;
+    private static final FluentBackoff BUNDLE_WRITE_BACKOFF =
+            FluentBackoff.DEFAULT
+                    .withMaxRetries(MAX_RETRIES)
+                    .withInitialBackoff(Duration.standardSeconds(5));
+    private String outputTable;
+    private Firestore firestore;
+    private String firestoreKey;
+
+    public FirestoreWriterFn(String outputTable, String firestoreKey) {
+        this.outputTable = outputTable;
+        this.writeBatcher = new WriteBatcherImpl();
+        this.firestoreKey = firestoreKey;
+    }
+
+    @StartBundle
+    public void startBundle(StartBundleContext c) {
+        firestore = FirestoreOptions.getDefaultInstance().getService();
+        writeBatcher.start();
+        if (throttler == null) {
+            // Initialize throttler at first use, because it is not 
serializable.
+            throttler = new AdaptiveThrottler(120000, 10000, 1.25);
+        }
+    }
+
+    @ProcessElement
+    public void processElement(ProcessContext c) throws Exception {
+        mutations.add(c.element());
+        if (mutations.size() >= 
writeBatcher.nextBatchSize(System.currentTimeMillis())) {
+            flushBatch();
+        }
+    }
+
+    @FinishBundle
+    public void finishBundle() throws Exception {
+        if (!mutations.isEmpty()) {
+            flushBatch();
+        }
+    }
+
+    /**
+     * Writes a batch of mutations to Cloud Firestore.
+     *
+     * <p>If a commit fails, it will be retried up to {@link #MAX_RETRIES} 
times. All mutations in
 
 Review comment:
   This doc is actually false. I've used Firestore "batched writes" which makes 
writing mutations an atomic operation. So all either succeeds or fails -> no 
risk of duplicating entries. I updated the docs.
 
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Issue Time Tracking
-------------------

    Worklog Id:     (was: 354283)
    Time Spent: 1h 20m  (was: 1h 10m)

> Add FirestoreIO connector to Java SDK
> -------------------------------------
>
>                 Key: BEAM-8376
>                 URL: https://issues.apache.org/jira/browse/BEAM-8376
>             Project: Beam
>          Issue Type: New Feature
>          Components: io-java-gcp
>            Reporter: Stefan Djelekar
>            Priority: Major
>          Time Spent: 1h 20m
>  Remaining Estimate: 0h
>
> Motivation:
> There is no Firestore connector for Java SDK at the moment.
> Having it will enhance the integrations with database options on the Google 
> Cloud Platform.



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