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From "Amir Langer (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-6552) add DN storage to a BlockInfo will not replace the different storage from same DN
Date Wed, 18 Jun 2014 06:00:47 GMT

     [ https://issues.apache.org/jira/browse/HDFS-6552?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Amir Langer updated HDFS-6552:
------------------------------

    Target Version/s: 2.4.0
              Status: Patch Available  (was: Open)

added tests that cover this scenario + fixed code. - Done on current branch-2


> add DN storage to a BlockInfo will not replace the different storage from same DN
> ---------------------------------------------------------------------------------
>
>                 Key: HDFS-6552
>                 URL: https://issues.apache.org/jira/browse/HDFS-6552
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: namenode
>    Affects Versions: 2.4.0, 2.3.0
>            Reporter: Amir Langer
>            Priority: Trivial
>             Fix For: Heterogeneous Storage (HDFS-2832)
>
>
> In BlockInfo - addStorage code looks wrong.
> At line 10 (below) - we remove the storage we're about to add from the list of storages,
then add it. 
> If the aim was to replace the different storage that was there the line should have been:
> {code:java}
> removeStorage(getStorageInfo(idx));
> {code}
> method code:
> {code:java}
> 1 boolean addStorage(DatanodeStorageInfo storage) {
> 2   boolean added = true;
> 3    int idx = findDatanode(storage.getDatanodeDescriptor());
> 4   if(idx >= 0) {
> 5      if (getStorageInfo(idx) == storage) { // the storage is already there
> 6        return false;
> 7      } else {
> 8        // The block is on the DN but belongs to a different storage.
> 9        // Update our state.
> 10        removeStorage(storage);
> 11        added = false;      // Just updating storage. Return false.
> 12     }
> 13  }
> 14  // find the last null node
> 15  int lastNode = ensureCapacity(1);
> 16  setStorageInfo(lastNode, storage);
> 17  setNext(lastNode, null);
> 18  setPrevious(lastNode, null);
> 19  return added;
> 20}
> {code}



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