[GitHub] [hadoop] steveloughran commented on pull request #5205: HADOOP-18546. log/probes of HADOOP-18546 presence.

[GitBox <gi...@apache.org>]

steveloughran commented on PR #5205:
URL: https://github.com/apache/hadoop/pull/5205#issuecomment-1344508771

   how to use this
   ```scala
   
   // ********************************************************************************************
   // probe a FS for the bug using path capabilities checks
   // ********************************************************************************************
   
   def isVulnerable(fspath: String): Boolean = {
     val p = path(fspath)
     if (!Set("abfs", "abfss").contains(p.toUri.getScheme)) {
       println("not an azure filesystem")
       return false;
     }
     val targetFS = bind(p);
     if (!targetFS.hasPathCapability(p, "fs.capability.paths.acls")) {
       println("The release predates the bugs addition to the codebase")
       return false;
     }
       if (!targetFS.hasPathCapability(p, "HADOOP-18546")) {
       println("The release has the HADOOP-18546 fix")
       return false;
     }
   
     println("The release is recent enough to contain the bug, and does not have the fix")
     val fsconf = targetFS.getConf
     if (fsconf.getBoolean("fs.azure.enable.readahead", false)) {
       println("readahead disabled (cloudera releases and hadoop 3.3.5+)")
       return false;
     }
     val depth = "fs.azure.readaheadqueue.depth"
     val queue = fsconf.getInt(depth, -1)
     if (queue == 0) {
       println(s"${depth} set to 0: safe")
       return false;
     }
     queue match {
       case -1 =>
         println(s"${depth} will be the default: unsafe")
         true;
       case 0 =>
         println(s"${depth} set to zero: safe")
         false
       case _ =>
         println(s"${depth} set to ${queue}: unsafe")
         false
     }
   }
   ```
   


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