zhaoyunjiong created HDFS-9054:
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Summary: Race condition on yieldCount in FSDirectory.java
Key: HDFS-9054
URL: https://issues.apache.org/jira/browse/HDFS-9054
Project: Hadoop HDFS
Issue Type: Bug
Components: namenode
Reporter: zhaoyunjiong
Assignee: zhaoyunjiong
Priority: Minor
getContentSummaryInt only held read lock, and it called fsd.addYieldCount which
may cause race condition:
{code}
private static ContentSummary getContentSummaryInt(FSDirectory fsd,
INodesInPath iip) throws IOException {
fsd.readLock();
try {
INode targetNode = iip.getLastINode();
if (targetNode == null) {
throw new FileNotFoundException("File does not exist: " +
iip.getPath());
}
else {
// Make it relinquish locks everytime contentCountLimit entries are
// processed. 0 means disabled. I.e. blocking for the entire duration.
ContentSummaryComputationContext cscc =
new ContentSummaryComputationContext(fsd, fsd.getFSNamesystem(),
fsd.getContentCountLimit(), fsd.getContentSleepMicroSec());
ContentSummary cs = targetNode.computeAndConvertContentSummary(cscc);
fsd.addYieldCount(cscc.getYieldCount());
return cs;
}
} finally {
fsd.readUnlock();
}
}
{code}
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