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https://issues.apache.org/jira/browse/NIFI-715?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14630012#comment-14630012
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Dan Bress commented on NIFI-715:
--------------------------------
I also got hung up by this issue today.
> InputStreamCallback InputStream reporting more bytes available than actually
> readable
> -------------------------------------------------------------------------------------
>
> Key: NIFI-715
> URL: https://issues.apache.org/jira/browse/NIFI-715
> Project: Apache NiFi
> Issue Type: Bug
> Components: Core Framework
> Affects Versions: 0.1.0
> Environment: OS X, Windows, Linux
> Reporter: Adam Moreland
> Priority: Minor
>
> When reading off of the InputStream within an InputStreamCallback, the
> InputStream appears to report the bytes available in the content claim from
> the start of the current flowFile through the end of the content claim.
> As a basic test, I ran three files (sizes 38 bytes, 93 bytes, and 20 bytes)
> through a GetFile processor followed by a basic processor that reads the
> flowFile and outputs the in.available() value, reads until it comes to the
> end of the file and outputs the number of bytes read. The output is as
> follows:
> 2015-06-22 20:23:19,447 INFO [Timer-Driven Process Thread-10]
> test.testprocessor.TestProcessor
> TestProcessor[id=386616eb-5ebc-4da9-8365-3b32fc539407] Bytes available: 151
> 2015-06-22 20:23:19,447 INFO [Timer-Driven Process Thread-10]
> test.testprocessor.TestProcessor
> TestProcessor[id=386616eb-5ebc-4da9-8365-3b32fc539407] Bytes read: 38
> 2015-06-22 20:23:19,448 INFO [Timer-Driven Process Thread-8]
> test.testprocessor.TestProcessor
> TestProcessor[id=386616eb-5ebc-4da9-8365-3b32fc539407] Bytes available: 113
> 2015-06-22 20:23:19,449 INFO [Timer-Driven Process Thread-8]
> test.testprocessor.TestProcessor
> TestProcessor[id=386616eb-5ebc-4da9-8365-3b32fc539407] Bytes read: 93
> 2015-06-22 20:23:19,449 INFO [Timer-Driven Process Thread-8]
> test.testprocessor.TestProcessor
> TestProcessor[id=386616eb-5ebc-4da9-8365-3b32fc539407] Bytes available: 20
> 2015-06-22 20:23:19,449 INFO [Timer-Driven Process Thread-8]
> test.testprocessor.TestProcessor
> TestProcessor[id=386616eb-5ebc-4da9-8365-3b32fc539407] Bytes read: 20
> Also affects the InputStream within a StreamCallback.
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