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  1. Accumulo
  2. ACCUMULO-3727

FileNotFoundException on failed/data during recovery

    Details

    • Type: Bug
    • Status: Open
    • Priority: Major
    • Resolution: Unresolved
    • Affects Version/s: 1.5.2
    • Fix Version/s: None
    • Component/s: tserver
    • Labels:
      None

      Description

      Over night there was a mass failure of Accumulo (most likely due to too many mappers for a job). After restarting Accumulo, one of the metadata tablets failed to load. There was a log message showing a `FileNotFoundException` on the file `hdfs:///accumulo/recovery/<log id>/failed/data`. Removing the `<log id>` directory from HDFS seemed to unclog the jam and things came back (though potentially with data loss).

      I wanted to investigate why somewhere in the plumbing of `TabletServer`, `TabletServerLogger`, and `SortedLogRecovery`, an attempt was made to use the `failure` file.

      I see in `SortedLogRecovery#sort` where the marker file gets created:

      public void sort(String name, Path srcPath, String destPath) {
      ...
            } catch (Throwable t) {
              try {
                // parent dir may not exist
                fs.mkdirs(new Path(destPath));
                fs.create(new Path(destPath, "failed")).close();
              } catch (IOException e) {
                log.error("Error creating failed flag file " + name, e);
              }
              log.error(t, t);
            } finally {
      ...
      

      I have not stepped out to figure out where/why the `failed` files gets included in the list of recovered data dir.

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            • Assignee:
              Unassigned
              Reporter:
              bills William Slacum
            • Votes:
              2 Vote for this issue
              Watchers:
              6 Start watching this issue

              Dates

              • Created:
                Updated: