# Invalid checksum in DLQ

**URL:** <https://discuss.elastic.co/t/invalid-checksum-in-dlq/194480>\
**Category:** Logstash\
**Created:** [August 8, 2019, 5:11pm UTC](https://discuss.elastic.co/t/invalid-checksum-in-dlq/194480 "2019-08-08T17:11:44Z")\
**Posts on this page:** 3\
**Page:** 1

<div class="post-metadata">

**Author:** ![amitavmohanty01](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/amitavmohanty01/32/58017_2.png) [@amitavmohanty01](https://discuss.elastic.co/u/amitavmohanty01)\
**Post date:** [August 8, 2019, 5:11pm UTC](https://discuss.elastic.co/t/invalid-checksum-in-dlq/194480/1 "2019-08-08T17:11:45Z")

</div>

I am getting an exception as follows:

```
[2019-08-08T09:52:26,478][ERROR][logstash.pipeline] A plugin had an unrecoverable error. Will restart this plugin.

Pipeline_id:dlqInstance

Plugin: <LogStash::Inputs::DeadLetterQueue pipeline_id=>"instance", path=>"/var/lib/logstash/dead_letter_queue", id=>"99a38b3b092e124b535d1bd025dc8be06c9cca68018506f5e0324c4b30465f14", commit_offsets=>true, enable_metric=>true, codec=><LogStash::Codecs::Plain id=>"plain_0980c072-c45d-4aa8-9963-31c6519386fc", enable_metric=>true, charset=>"UTF-8">>

Error: invalid checksum of record

Exception: Java::JavaLang::RuntimeException

Stack: org.logstash.common.io.RecordIOReader.getRecord(org/logstash/common/io/RecordIOReader.java:217)

org.logstash.common.io.RecordIOReader.readEvent(org/logstash/common/io/RecordIOReader.java:233)

org.logstash.common.io.DeadLetterQueueReader.pollEntryBytes(org/logstash/common/io/DeadLetterQueueReader.java:120)

org.logstash.common.io.DeadLetterQueueReader.pollEntry(org/logstash/common/io/DeadLetterQueueReader.java:97)

org.logstash.input.DeadLetterQueueInputPlugin.run(org/logstash/input/DeadLetterQueueInputPlugin.java:82)

java.lang.reflect.Method.invoke(java/lang/reflect/Method.java:498)

org.jruby.javasupport.JavaMethod.invokeDirectWithExceptionHandling(org/jruby/javasupport/JavaMethod.java:453)

org.jruby.javasupport.JavaMethod.invokeDirect(org/jruby/javasupport/JavaMethod.java:314)

usr.share.logstash.vendor.bundle.jruby.$2_dot_3_dot_0.gems.logstash_minus_input_minus_dead_letter_queue_minus_1_dot_1_dot_4.lib.logstash.inputs.dead_letter_queue.run(/usr/share/logstash/vendor/bundle/jruby/2.3.0/gems/logstash-input-dead_letter_queue-1.1.4/lib/logstash/inputs/dead_letter_queue.rb:60)

usr.share.logstash.logstash_minus_core.lib.logstash.pipeline.inputworker(/usr/share/logstash/logstash-core/lib/logstash/pipeline.rb:426)

usr.share.logstash.logstash_minus_core.lib.logstash.pipeline.block in start_input(/usr/share/logstash/logstash-core/lib/logstash/pipeline.rb:420)

org.jruby.RubyProc.call(org/jruby/RubyProc.java:289)

org.jruby.RubyProc.call(org/jruby/RubyProc.java:246)

java.lang.Thread.run(java/lang/Thread.java:748)

```

Please suggest how do I proceed with debugging it.

---

<div class="post-metadata">

**Author:** ![amitavmohanty01](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/amitavmohanty01/32/58017_2.png) [@amitavmohanty01](https://discuss.elastic.co/u/amitavmohanty01)\
**Post date:** [August 8, 2019, 6:08pm UTC](https://discuss.elastic.co/t/invalid-checksum-in-dlq/194480/2 "2019-08-08T18:08:22Z")

</div>

I have gone through a similar [post](https://discuss.elastic.co/t/dlq-error-invalid-checksum-of-record/149427) but my case seems to be different.

---

<div class="post-metadata">

**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [September 7, 2019, 4:15am UTC](https://discuss.elastic.co/t/invalid-checksum-in-dlq/194480/4 "2019-09-07T04:15:02Z")

</div>

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