Yiyuan GUO created HDFS-16029:
---------------------------------
Summary: Divide by zero bug in InstrumentationService.java
Key: HDFS-16029
URL: https://issues.apache.org/jira/browse/HDFS-16029
Project: Hadoop HDFS
Issue Type: Bug
Components: security
Reporter: Yiyuan GUO
In the file _lib/service/instrumentation/InstrumentationService.java,_ the
method
_Timer.getValues_ has the following
[code|https://github.com/apache/hadoop/blob/trunk/hadoop-hdfs-project/hadoop-hdfs-httpfs/src/main/java/org/apache/hadoop/lib/service/instrumentation/InstrumentationService.java#L236]:
{code:java}
long[] getValues() {
......
int limit = (full) ? size : (last + 1);
......
values[AVG_TOTAL] = values[AVG_TOTAL] / limit;
}
{code}
The variable _limit_ is used as a divisor. However, its value may be equal to
_last + 1,_ which can be zero since _last_ is __ initialized to -1 in the
[constructor|https://github.com/apache/hadoop/blob/trunk/hadoop-hdfs-project/hadoop-hdfs-httpfs/src/main/java/org/apache/hadoop/lib/service/instrumentation/InstrumentationService.java#L222]:
{code:java}
public Timer(int size) {
...
last = -1;
}
{code}
Thus, a divide by zero problem can happen
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