[jira] [Created] (HDFS-15515) mkdirs on fallback should throw IOE out instead of suppressing and returning false

["Uma Maheswara Rao G (Jira)" <ji...@apache.org>]

Uma Maheswara Rao G created HDFS-15515:
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             Summary: mkdirs on fallback should throw IOE out instead of suppressing and returning false
                 Key: HDFS-15515
                 URL: https://issues.apache.org/jira/browse/HDFS-15515
             Project: Hadoop HDFS
          Issue Type: Sub-task
            Reporter: Uma Maheswara Rao G
            Assignee: Uma Maheswara Rao G


Currently when doing mkdirs on fallback dir, we catching IOE and returning false.
I think we should just throw IOE out as the fs#mkdirs throws IOE out.

I noticed a case when we attempt to create .reserved dirs, NN throws HadoopIAE.
But we will catch and return false. Here exception should be thrown out.


{code:java}
try {
          return linkedFallbackFs.mkdirs(dirToCreate, permission);
        } catch (IOException e) {
          if (LOG.isDebugEnabled()) {
            StringBuilder msg =
                new StringBuilder("Failed to create ").append(dirToCreate)
                    .append(" at fallback : ")
                    .append(linkedFallbackFs.getUri());
            LOG.debug(msg.toString(), e);
          }
          return false;
        }
{code}




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