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https://issues.apache.org/jira/browse/BEAM-7450?focusedWorklogId=259158&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-259158
]
ASF GitHub Bot logged work on BEAM-7450:
----------------------------------------
Author: ASF GitHub Bot
Created on: 12/Jun/19 23:23
Start Date: 12/Jun/19 23:23
Worklog Time Spent: 10m
Work Description: jkff commented on pull request #8718: [BEAM-7450] Add
an unbounded HcatalogIO reader using splittable pardo
URL: https://github.com/apache/beam/pull/8718#discussion_r293154570
##########
File path:
sdks/java/io/hcatalog/src/main/java/org/apache/beam/sdk/io/hcatalog/PartitionPollerFn.java
##########
@@ -0,0 +1,71 @@
+/*
+ * 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.hcatalog;
+
+import java.util.List;
+import java.util.Map;
+import java.util.stream.Collectors;
+import org.apache.beam.sdk.io.hcatalog.HCatalogIO.Read;
+import org.apache.beam.sdk.transforms.DoFn.Setup;
+import org.apache.beam.sdk.transforms.DoFn.Teardown;
+import org.apache.beam.sdk.transforms.Watch.Growth.PollFn;
+import org.apache.beam.sdk.transforms.Watch.Growth.PollResult;
+import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.hive.metastore.IMetaStoreClient;
+import org.joda.time.Instant;
+
+/** Unbounded poller to listen for new partitions. */
+public class PartitionPollerFn extends PollFn<Read, Read> {
+ private transient IMetaStoreClient metaStoreClient;
+ private Map<String, String> configProperties;
+
+ public PartitionPollerFn(Map<String, String> configProperties) {
+ this.configProperties = configProperties;
+ }
+
+ @Override
+ public PollResult<Read> apply(Read element, Context c) throws Exception {
+ Instant now = Instant.now();
+ return PollResult.incomplete(now,
getPartitions(element)).withWatermark(now);
+ }
+
+ private List<Read> getPartitions(Read read) throws Exception {
+ return metaStoreClient.listPartitions(read.getDatabase(), read.getTable(),
Short.MAX_VALUE)
+ .stream()
+ .map(partition -> read.withPartitionToRead(partition))
+ .collect(Collectors.toList());
+ }
+
+ @Setup
Review comment:
Poll fns don't have setup or teardown, you need to put this into apply()
itself.
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Issue Time Tracking
-------------------
Worklog Id: (was: 259158)
Time Spent: 6h 10m (was: 6h)
> Unbounded HCatalogIO Reader using splittable pardos
> ---------------------------------------------------
>
> Key: BEAM-7450
> URL: https://issues.apache.org/jira/browse/BEAM-7450
> Project: Beam
> Issue Type: New Feature
> Components: sdk-java-core
> Reporter: Ankit Jhalaria
> Assignee: Ankit Jhalaria
> Priority: Minor
> Time Spent: 6h 10m
> Remaining Estimate: 0h
>
> # Current version of HcatalogIO is a bounded source.
> # While migrating our jobs to aws, we realized that it would be helpful to
> have an unbounded hcat reader that can behave as an unbounded source and
> polls for new partitions as and when they become available.
> # I have used splittable pardo(s) to do this. There is a flag that can be
> set to treat this as a bounded source which will terminate if that flag is
> set.
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