[jira] [Created] (HDFS-10115) CLONE - Fix a decoding issue in stripped block recovering in client side

["dragon (JIRA)" <ji...@apache.org>]

dragon created HDFS-10115:
-----------------------------

             Summary: CLONE - Fix a decoding issue in stripped block recovering in client side
                 Key: HDFS-10115
                 URL: https://issues.apache.org/jira/browse/HDFS-10115
             Project: Hadoop HDFS
          Issue Type: Sub-task
            Reporter: dragon
            Assignee: Kai Zheng
             Fix For: HDFS-7285


[~jingzhao] reported a decoding issue in HDFS-8481 in the comment copied below:
bq. While debugging HDFS-8319, I just found that in TestWriteReadStripedFile#testWritePreadWithDNFailure, if we change the startOffsetInFile from cellSize * 5 to 0, the test fails with the following error msg:
{noformat}
java.lang.AssertionError: Byte at 524288 should be the same expected:<27> but was:<-9>
	at org.junit.Assert.fail(Assert.java:88)
	at org.junit.Assert.failNotEquals(Assert.java:743)
	at org.junit.Assert.assertEquals(Assert.java:118)
	at org.junit.Assert.assertEquals(Assert.java:555)
	at org.apache.hadoop.hdfs.TestWriteReadStripedFile.testWritePreadWithDNFailure(TestWriteReadStripedFile.java:390)
{noformat}

It was caused by an issue that we need to adjust the inputs order to call decoder#decode. When startOffsetInFile is 5 * cellSize, the recovering or decoding won't be needed as ZERO cells don't need to recover; when it's 0, the issue then was exposed, as normal data cells must be recovered thru the decoding.



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