[
https://issues.apache.org/jira/browse/MAPREDUCE-6990?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Ting Dai updated MAPREDUCE-6990:
--------------------------------
Description:
When file is corrupted, for example, bad encoding,
[Yarn-2724](https://issues.apache.org/jira/browse/YARN-2724), the
FileInputStream can return 0, causing the while loop in TaskLog$Reader become
infinite.
{code:java}
public Reader(TaskAttemptID taskid, LogName kind, long start, long end,
boolean isCleanup) throws IOException {
// find the right log file
LogFileDetail fileDetail = getLogFileDetail(taskid, kind, isCleanup);
// calculate the start and stop
long size = fileDetail.length;
if (start < 0) {
start += size + 1;
}
if (end < 0) {
end += size + 1;
}
start = Math.max(0, Math.min(start, size));
end = Math.max(0, Math.min(end, size));
start += fileDetail.start;
end += fileDetail.start;
bytesRemaining = end - start;
String owner = obtainLogDirOwner(taskid);
file = SecureIOUtils.openForRead(new File(fileDetail.location,
kind.toString()), owner, null);
// skip upto start
long pos = 0;
while (pos < start) {
long result = file.skip(start - pos);
if (result < 0) {
bytesRemaining = 0;
break;
}
pos += result;
}
}
{code}
Similar bugs are
[Hadoop-8614](https://issues.apache.org/jira/browse/HADOOP-8614),
[Yarn-2905](https://issues.apache.org/jira/browse/YARN-2905)
was:
When file is corrupted, for example, bad encoding,
[Yarn-2724](https://issues.apache.org/jira/browse/YARN-2724), the
FileInputStream can return 0, causing the while loop in TaskLog$Reader become
infinite.
{code:java}
// Some comments here
public Reader(TaskAttemptID taskid, LogName kind,
long start, long end, boolean isCleanup) throws IOException {
// find the right log file
LogFileDetail fileDetail = getLogFileDetail(taskid, kind, isCleanup);
// calculate the start and stop
long size = fileDetail.length;
if (start < 0) {
start += size + 1;
}
if (end < 0) {
end += size + 1;
}
start = Math.max(0, Math.min(start, size));
end = Math.max(0, Math.min(end, size));
start += fileDetail.start;
end += fileDetail.start;
bytesRemaining = end - start;
String owner = obtainLogDirOwner(taskid);
file = SecureIOUtils.openForRead(new File(fileDetail.location,
kind.toString()),
owner, null);
// skip upto start
long pos = 0;
while (pos < start) {
long result = file.skip(start - pos);
if (result < 0) {
bytesRemaining = 0;
break;
}
pos += result;
}
}
{code}
Similar bugs are
[Hadoop-8614](https://issues.apache.org/jira/browse/HADOOP-8614),
[Yarn-2905](https://issues.apache.org/jira/browse/YARN-2905)
> FileInputStream.skip function can return 0 when the file is corrupted,
> causing an infinite loop
> -----------------------------------------------------------------------------------------------
>
> Key: MAPREDUCE-6990
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-6990
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Affects Versions: 0.23.0
> Reporter: Ting Dai
>
> When file is corrupted, for example, bad encoding,
> [Yarn-2724](https://issues.apache.org/jira/browse/YARN-2724), the
> FileInputStream can return 0, causing the while loop in TaskLog$Reader become
> infinite.
> {code:java}
> public Reader(TaskAttemptID taskid, LogName kind, long start, long end,
> boolean isCleanup) throws IOException {
> // find the right log file
> LogFileDetail fileDetail = getLogFileDetail(taskid, kind, isCleanup);
> // calculate the start and stop
> long size = fileDetail.length;
> if (start < 0) {
> start += size + 1;
> }
> if (end < 0) {
> end += size + 1;
> }
> start = Math.max(0, Math.min(start, size));
> end = Math.max(0, Math.min(end, size));
> start += fileDetail.start;
> end += fileDetail.start;
> bytesRemaining = end - start;
> String owner = obtainLogDirOwner(taskid);
> file = SecureIOUtils.openForRead(new File(fileDetail.location,
> kind.toString()), owner, null);
> // skip upto start
> long pos = 0;
> while (pos < start) {
> long result = file.skip(start - pos);
> if (result < 0) {
> bytesRemaining = 0;
> break;
> }
> pos += result;
> }
> }
> {code}
> Similar bugs are
> [Hadoop-8614](https://issues.apache.org/jira/browse/HADOOP-8614),
> [Yarn-2905](https://issues.apache.org/jira/browse/YARN-2905)
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