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https://issues.apache.org/jira/browse/BEAM-7450?focusedWorklogId=258143&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-258143
]
ASF GitHub Bot logged work on BEAM-7450:
----------------------------------------
Author: ASF GitHub Bot
Created on: 11/Jun/19 21:36
Start Date: 11/Jun/19 21:36
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_r292669368
##########
File path:
sdks/java/io/hcatalog/src/main/java/org/apache/beam/sdk/io/hcatalog/PartitionPollerFn.java
##########
@@ -0,0 +1,141 @@
+/*
+ * 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.ArrayList;
+import java.util.Collections;
+import java.util.List;
+import java.util.Map;
+import org.apache.beam.sdk.io.hcatalog.HCatalogIO.Read;
+import org.apache.beam.sdk.transforms.DoFn;
+import org.apache.beam.sdk.transforms.DoFn.UnboundedPerElement;
+import org.apache.beam.sdk.transforms.SerializableComparator;
+import org.apache.beam.sdk.transforms.splittabledofn.RestrictionTracker;
+import
org.apache.beam.vendor.guava.v20_0.com.google.common.collect.ImmutableList;
+import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.hive.metastore.IMetaStoreClient;
+import org.apache.hadoop.hive.metastore.api.Partition;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/** Unbounded poller to listen for new partitions. */
+@UnboundedPerElement
+class PartitionPollerFn extends DoFn<Read, Read> {
Review comment:
Can this one be replaced with a Watch transform, whose PollFn returns a
complete list of current partitions? it scales quite well (if I remember
correctly, e.g. a million elements was not a problem, as long as you encode
them efficiently), and seems like it would save you a huge amount of code in
this PR.
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Issue Time Tracking
-------------------
Worklog Id: (was: 258143)
Time Spent: 4h 20m (was: 4h 10m)
> 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: 4h 20m
> 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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