Yongjun Zhang created HADOOP-13339:
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Summary: MetricsSourceAdapter#updateAttrCache may throw NPE due to
NULL lastRecs
Key: HADOOP-13339
URL: https://issues.apache.org/jira/browse/HADOOP-13339
Project: Hadoop Common
Issue Type: Bug
Reporter: Yongjun Zhang
Assignee: Yongjun Zhang
The for loop below may find lastRecs NULL
{code}
private int updateAttrCache() {
LOG.debug("Updating attr cache...");
int recNo = 0;
int numMetrics = 0;
for (MetricsRecordImpl record : lastRecs) {
for (MetricsTag t : record.tags()) {
setAttrCacheTag(t, recNo);
++numMetrics;
}
for (AbstractMetric m : record.metrics()) {
setAttrCacheMetric(m, recNo);
++numMetrics;
}
++recNo;
}
LOG.debug("Done. # tags & metrics="+ numMetrics);
return numMetrics;
}
{code}
and throws NPE.
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