Andy Isaacson created HDFS-3485:
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Summary: DataTransferThrottler will over-throttle when
currentTimeMillis jumps
Key: HDFS-3485
URL: https://issues.apache.org/jira/browse/HDFS-3485
Project: Hadoop HDFS
Issue Type: Bug
Affects Versions: 2.0.0-alpha
Reporter: Andy Isaacson
Assignee: Andy Isaacson
Priority: Minor
When the system clock is set backwards, DataTransferThrottler will simply pause
until the clock reaches the end of the previously calculated transfer period:
{code}
this.curPeriodStart = System.currentTimeMillis();
...
while (curReserve <= 0) {
long now = System.currentTimeMillis();
long curPeriodEnd = curPeriodStart + period;
if ( now < curPeriodEnd ) {
try {
wait( curPeriodEnd - now );
{code}
Instead of using currentTimeMillis() which is affected by system-clock-changes,
this code should use nanoTime which ticks forward monotonically.
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