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https://issues.apache.org/jira/browse/HADOOP-14072?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15861309#comment-15861309
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Genmao Yu commented on HADOOP-14072:
------------------------------------

result of hadoop-aliyun unit tests:

{code}
-------------------------------------------------------
 T E S T S
-------------------------------------------------------

-------------------------------------------------------
 T E S T S
-------------------------------------------------------
Running org.apache.hadoop.fs.aliyun.oss.contract.TestAliyunOSSContractCreate
Tests run: 10, Failures: 0, Errors: 0, Skipped: 2, Time elapsed: 8.349 sec - in 
org.apache.hadoop.fs.aliyun.oss.contract.TestAliyunOSSContractCreate
Running org.apache.hadoop.fs.aliyun.oss.contract.TestAliyunOSSContractDelete
Tests run: 8, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 8.045 sec - in 
org.apache.hadoop.fs.aliyun.oss.contract.TestAliyunOSSContractDelete
Running org.apache.hadoop.fs.aliyun.oss.contract.TestAliyunOSSContractDistCp
Tests run: 4, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 150.439 sec - 
in org.apache.hadoop.fs.aliyun.oss.contract.TestAliyunOSSContractDistCp
Running 
org.apache.hadoop.fs.aliyun.oss.contract.TestAliyunOSSContractGetFileStatus
Tests run: 18, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 17.429 sec - 
in org.apache.hadoop.fs.aliyun.oss.contract.TestAliyunOSSContractGetFileStatus
Running org.apache.hadoop.fs.aliyun.oss.contract.TestAliyunOSSContractMkdir
Tests run: 5, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 5.245 sec - in 
org.apache.hadoop.fs.aliyun.oss.contract.TestAliyunOSSContractMkdir
Running org.apache.hadoop.fs.aliyun.oss.contract.TestAliyunOSSContractOpen
Tests run: 6, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 4.22 sec - in 
org.apache.hadoop.fs.aliyun.oss.contract.TestAliyunOSSContractOpen
Running org.apache.hadoop.fs.aliyun.oss.contract.TestAliyunOSSContractRename
Tests run: 6, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 6.439 sec - in 
org.apache.hadoop.fs.aliyun.oss.contract.TestAliyunOSSContractRename
Running org.apache.hadoop.fs.aliyun.oss.contract.TestAliyunOSSContractRootDir
Tests run: 9, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 5.276 sec - in 
org.apache.hadoop.fs.aliyun.oss.contract.TestAliyunOSSContractRootDir
Running org.apache.hadoop.fs.aliyun.oss.contract.TestAliyunOSSContractSeek
Tests run: 19, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 11.108 sec - 
in org.apache.hadoop.fs.aliyun.oss.contract.TestAliyunOSSContractSeek
Running org.apache.hadoop.fs.aliyun.oss.TestAliyunCredentials
Tests run: 2, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 2.19 sec - in 
org.apache.hadoop.fs.aliyun.oss.TestAliyunCredentials
Running org.apache.hadoop.fs.aliyun.oss.TestAliyunOSSFileSystemContract
Tests run: 46, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 27.106 sec - 
in org.apache.hadoop.fs.aliyun.oss.TestAliyunOSSFileSystemContract
Running org.apache.hadoop.fs.aliyun.oss.TestAliyunOSSFileSystemStore
Tests run: 2, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 61.443 sec - in 
org.apache.hadoop.fs.aliyun.oss.TestAliyunOSSFileSystemStore
Running org.apache.hadoop.fs.aliyun.oss.TestAliyunOSSInputStream
Tests run: 3, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 9.97 sec - in 
org.apache.hadoop.fs.aliyun.oss.TestAliyunOSSInputStream
Running org.apache.hadoop.fs.aliyun.oss.TestAliyunOSSOutputStream
Tests run: 3, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 10.467 sec - in 
org.apache.hadoop.fs.aliyun.oss.TestAliyunOSSOutputStream

Results :

Tests run: 141, Failures: 0, Errors: 0, Skipped: 2
{code}

> AliyunOSS: Failed to read from stream when seek beyond the download size.
> -------------------------------------------------------------------------
>
>                 Key: HADOOP-14072
>                 URL: https://issues.apache.org/jira/browse/HADOOP-14072
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: fs/oss
>    Affects Versions: 3.0.0-alpha2
>            Reporter: Genmao Yu
>            Assignee: Genmao Yu
>         Attachments: HADOOP-14072.001.patch
>
>
> {code}
> public synchronized void seek(long pos) throws IOException {
>     checkNotClosed();
>     if (position == pos) {
>       return;
>     } else if (pos > position && pos < position + partRemaining) {
>       AliyunOSSUtils.skipFully(wrappedStream, pos - position);
>       position = pos;
>     } else {
>       reopen(pos);
>     }
>   }
> {code}
> In seek function, we need to update the partRemaining when the seeking 
> position is located in downloaded part.



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