[jira] [Created] (SOLR-11473) Make HDFSDirectoryFactory support other prefixes (besides hdfs:/)

["Radu Gheorghe (JIRA)" <ji...@apache.org>]

Radu Gheorghe created SOLR-11473:
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             Summary: Make HDFSDirectoryFactory support other prefixes (besides hdfs:/)
                 Key: SOLR-11473
                 URL: https://issues.apache.org/jira/browse/SOLR-11473
             Project: Solr
          Issue Type: Improvement
      Security Level: Public (Default Security Level. Issues are Public)
          Components: hdfs
    Affects Versions: 6.6.1
            Reporter: Radu Gheorghe
            Priority: Minor


Not sure if it's a bug or a missing feature :) I'm trying to make Solr work on Alluxio, as described by [~thelabdude] in https://www.slideshare.net/thelabdude/running-solr-in-the-cloud-at-memory-speed-with-alluxio/1

The problem I'm facing here is with autoAddReplicas. If I have replicationFactor=1 and the node with that replica dies, the node taking over incorrectly assigns the data directory. For example:

before
{code}"dataDir":"alluxio://localhost:19998/solr/test/",{code}

after
{code}"dataDir":"alluxio://localhost:19998/solr/test/core_node1/alluxio://localhost:19998/solr/test/",{code}

The same happens for ulogDir. Apparently, this has to do with this bit from HDFSDirectoryFactory:
{code}  public boolean isAbsolute(String path) {
    return path.startsWith("hdfs:/");
  }{code}

If I add "alluxio:/" in there, the paths are correct and the index is recovered.

I see a few options here:
* add "alluxio:/" to the list there
* add a regular expression in the lines of \[a-z]*:/ I hope that's not too expensive, I'm not sure how often this method is called
* don't do anything and expect alluxio to work with an "hdfs:/" path? I actually tried that and didn't manage to make it work
* have a different DirectoryFactory or something else?

What do you think?



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