A single failed name dir can cause the NN to exit
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Key: HDFS-2702
URL: https://issues.apache.org/jira/browse/HDFS-2702
Project: Hadoop HDFS
Issue Type: Bug
Affects Versions: 0.20.205.0
Reporter: Eli Collins
Assignee: Eli Collins
Priority: Critical
Fix For: 1.1.0
There's a bug in FSEditLog#rollEditLog which results in the NN process exiting
if a single name dir has failed. Here's the relevant code:
{code}
close() // So editStreams.size() is 0
foreach edits dir {
..
eStream = new ... // Might get an IOE here
editStreams.add(eStream);
} catch (IOException ioe) {
removeEditsForStorageDir(sd); // exits if editStreams.size() <= 1
}
{code}
If we get an IOException before we've added two edits streams to the list we'll
exit, eg if there's an error processing the 1st name dir we'll exit even if
there are 4 valid name dirs. The fix is to move the checking out of
removeEditsForStorageDir (nee processIOError) or modify it so it can be
disabled in some cases, eg here where we don't yet know how many streams are
valid.
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