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https://issues.apache.org/jira/browse/BEAM-12474?focusedWorklogId=620168&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-620168
]
ASF GitHub Bot logged work on BEAM-12474:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 07/Jul/21 19:07
Start Date: 07/Jul/21 19:07
Worklog Time Spent: 10m
Work Description: zhoufek commented on a change in pull request #15037:
URL: https://github.com/apache/beam/pull/15037#discussion_r665636511
##########
File path:
sdks/java/core/src/main/java/org/apache/beam/sdk/util/ComparableThrowable.java
##########
@@ -0,0 +1,112 @@
+/*
+ * 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.util;
+
+import java.io.Serializable;
+import java.util.Arrays;
+import javax.annotation.Nullable;
+
+/**
+ * A wrapper around a {@link Throwable} for use with coders.
+ *
+ * <p>The {@link Throwable} class is serializable. However, it, along with man
child classes like
+ * {@link Exception}, does not override {@link Object#equals(Object)}. As a
result, t1.equals(t2)
+ * will return false if t2 is a deserialized instance of serialized t1. This
makes it appear as if
+ * coders are mutating the value, which can lead to things like log spam. This
wrapper overrides
+ * {@link Object#equals(Object)} to get around this issue. The hash code
remains the same as the
+ * underlying {@link Throwable}.
+ *
+ * <p>The equality comparison is transitive, meaning that for two {@link
Throwable}s t1 and t2, the
+ * causes must be equal. This can occur either because they are both null or
because they are both
+ * equal after being wrapped.
+ *
+ * <p>Note that this is simply a best effort based on properties like instance
type, stack trace,
+ * message, and cause. It cannot guarantee that the state that led to the
exception is the same,
+ * unless it is fully captured in the message, nor can it differentiate
between two exceptions
+ * thrown at different times or in different processes. For this reason, this
is not suitable for a
+ * general-purpose {@link Throwable} equality comparison. It merely exists to
try to avoid false
+ * positives in a mutation check for coders.
+ *
+ * <p>Due to the above, this does not support comparison to a raw {@link
Throwable}.
+ */
+public class ComparableThrowable implements Serializable {
Review comment:
Maybe `EncodableThrowable`? Since `Throwable` is already a serializable
type, and the real purpose is for safer use with coders, which use
encode/decode.
Also, I'll be changing the class to be final to avoid potential issues with
`equals` inheritance. (I don't think I had any reason to not mark it final. I
think I just forgot to do so.)
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Issue Time Tracking
-------------------
Worklog Id: (was: 620168)
Time Spent: 4h 50m (was: 4h 40m)
> Configure PubsubIO with dead-letter topic
> -----------------------------------------
>
> Key: BEAM-12474
> URL: https://issues.apache.org/jira/browse/BEAM-12474
> Project: Beam
> Issue Type: Improvement
> Components: io-java-gcp
> Reporter: Zachary Houfek
> Assignee: Zachary Houfek
> Priority: P2
> Time Spent: 4h 50m
> Remaining Estimate: 0h
>
> Based on discussion from [PR14971|https://github.com/apache/beam/pull/14971].
> Currently, PubsubIO throws a RuntimeException when it can't parse a payload.
> It would perhaps be helpful if users could configure PubsubIO.Read with a
> dead-letter topic so that parsing errors instead write to the topic rather
> than just throw an exception.
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