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https://issues.apache.org/jira/browse/HADOOP-15822?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16642522#comment-16642522
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Jason Lowe commented on HADOOP-15822:
-------------------------------------

Looked into the unit test failures.
* TestNameNodeMetadataConsistency failure is an existing issue tracked by 
HDFS-11439
* TestBalancer test has been failing in other precommit builds, filed HDFS-13975
* TestStandbyCheckpoints does not look related and does not reproduce locally
* TestHAAppend is an inode create timeout that does not look related and does 
not reproduce locally
* TestDirectoryScanner is a timeout that does not look related and does not 
reproduce locally
* TestTimelineReaderWebServicesHBaseStorage has been failing in nightly builds, 
filed YARN-8856


> zstd compressor can fail with a small output buffer
> ---------------------------------------------------
>
>                 Key: HADOOP-15822
>                 URL: https://issues.apache.org/jira/browse/HADOOP-15822
>             Project: Hadoop Common
>          Issue Type: Bug
>    Affects Versions: 2.9.0, 3.0.0
>            Reporter: Jason Lowe
>            Assignee: Jason Lowe
>            Priority: Major
>         Attachments: HADOOP-15822.001.patch, HADOOP-15822.002.patch
>
>
> TestZStandardCompressorDecompressor fails a couple of tests on my machine 
> with the latest zstd library (1.3.5).  Compression can fail to successfully 
> finalize the stream when a small output buffer is used resulting in a failed 
> to init error, and decompression with a direct buffer can fail with an 
> invalid src size error.



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