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Posted to common-issues@hadoop.apache.org by "Hadoop QA (JIRA)" <ji...@apache.org> on 2017/11/22 10:21:00 UTC
[jira] [Commented] (HADOOP-15063) IOException may be thrown when
read from Aliyun OSS in some case
[ https://issues.apache.org/jira/browse/HADOOP-15063?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16262240#comment-16262240 ]
Hadoop QA commented on HADOOP-15063:
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| (x) *{color:red}-1 overall{color}* |
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|| Vote || Subsystem || Runtime || Comment ||
| {color:blue}0{color} | {color:blue} reexec {color} | {color:blue} 0m 0s{color} | {color:blue} Docker mode activated. {color} |
| {color:red}-1{color} | {color:red} patch {color} | {color:red} 0m 4s{color} | {color:red} HADOOP-15063 does not apply to trunk. Rebase required? Wrong Branch? See https://wiki.apache.org/hadoop/HowToContribute for help. {color} |
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|| Subsystem || Report/Notes ||
| JIRA Issue | HADOOP-15063 |
| JIRA Patch URL | https://issues.apache.org/jira/secure/attachment/12898815/HADOOP-15063.001.patch |
| Console output | https://builds.apache.org/job/PreCommit-HADOOP-Build/13736/console |
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> IOException may be thrown when read from Aliyun OSS in some case
> ----------------------------------------------------------------
>
> Key: HADOOP-15063
> URL: https://issues.apache.org/jira/browse/HADOOP-15063
> Project: Hadoop Common
> Issue Type: Bug
> Components: fs/oss
> Affects Versions: 3.0.0-alpha2, 3.0.0-beta1
> Reporter: wujinhu
> Assignee: wujinhu
> Attachments: HADOOP-15063.001.patch
>
>
> IOException will be thrown in this case
> 1. set part size = n(102400)
> 2. assume current position = 0, then partRemaining = 102400
> 3. we call seek(pos = 101802), with pos > position && pos < position + partRemaining, so it will skip pos - position bytes, but partRemaining remains the same
> 4. if we read bytes more than n - pos, it will throw IOException.
> Current code:
> {code:java}
> @Override
> 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);
> // we need update partRemaining here
> position = pos;
> } else {
> reopen(pos);
> }
> }
> {code}
> Logs:
> java.io.IOException: Failed to read from stream. Remaining:101802
> at org.apache.hadoop.fs.aliyun.oss.AliyunOSSInputStream.read(AliyunOSSInputStream.java:182)
> at org.apache.hadoop.fs.FSInputStream.read(FSInputStream.java:75)
> at org.apache.hadoop.fs.FSDataInputStream.read(FSDataInputStream.java:92)
> How to re-produce:
> 1. create a file with 10MB size
> 2.
> {code:java}
> int seekTimes = 150;
> for (int i = 0; i < seekTimes; i++) {
> long pos = size / (seekTimes - i) - 1;
> LOG.info("begin seeking for pos: " + pos);
> byte []buf = new byte[1024];
> instream.read(pos, buf, 0, 1024);
> }
> {code}
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