Daniel Templeton created HDFS-13913:
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Summary: LazyPersistFileScrubber.run() error handling is poor
Key: HDFS-13913
URL: https://issues.apache.org/jira/browse/HDFS-13913
Project: Hadoop HDFS
Issue Type: Improvement
Components: namenode
Affects Versions: 3.1.0
Reporter: Daniel Templeton
Assignee: Daniel Green
In {{LazyPersistFileScrubber.run()}} we have:
{code}
try {
clearCorruptLazyPersistFiles();
} catch (Exception e) {
FSNamesystem.LOG.error(
"Ignoring exception in LazyPersistFileScrubber:", e);
}
{code}
First problem is that catching {{Exception}} is sloppy. It should instead be a
multicatch for the actual exceptions thrown or better a set of separate catch
statements that react appropriately to the type of exception.
Second problem is that it's bad to log an ERROR that's not actionable and that
can be safely ignored. The log message should be logged at WARN or INFO level.
Third, the log message is useless. If it's going to be a WARN or ERROR, a log
message should be actionable. Otherwise it's an info. A log message should
contain enough information for an admin to understand what it means.
In the end, I think the right thing here is to leave the high-level behavior
unchanged: log a message and ignore the error, hoping that the next run will go
better.
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