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https://issues.apache.org/jira/browse/HDFS-4424?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13560205#comment-13560205
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Brandon Li commented on HDFS-4424:
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> fsdataset Mkdirs failed cause nullpointexception and other bad
> consequence
> -------------------------------------------------------------------------------
>
> Key: HDFS-4424
> URL: https://issues.apache.org/jira/browse/HDFS-4424
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: datanode
> Affects Versions: 1.0.1
> Reporter: Li Junjun
>
> File: /hadoop-1.0.1/hdfs/org/apache/hadoop/hdfs/server/datanode/FSDataset.java
> from line 205:
> if (children == null || children.length == 0) {
> children = new FSDir[maxBlocksPerDir];
> for (int idx = 0; idx < maxBlocksPerDir; idx++) {
> children[idx] = new FSDir(new File(dir,
> DataStorage.BLOCK_SUBDIR_PREFIX+idx));
> }
> }
> in FSDir constructer method if faild ( space full,so mkdir fails ), but
> the children still in use !
> the the write comes(after I run balancer ) , when choose FSDir
> line 192:
> File file = children[idx].addBlock(b, src, false, resetIdx);
> cause exceptions like this
> at
> org.apache.hadoop.hdfs.server.datanode.FSDataset$FSDir.addBlock(FSDataset.java:192)
> at
> org.apache.hadoop.hdfs.server.datanode.FSDataset$FSDir.addBlock(FSDataset.java:192)
> at
> org.apache.hadoop.hdfs.server.datanode.FSDataset$FSDir.addBlock(FSDataset.java:158)
> ------------------------------------------------
> should it like this
> if (children == null || children.length == 0) {
> List childrenList = new ArrayList();
>
> for (int idx = 0; idx < maxBlocksPerDir; idx++) {
> try{
> childrenList .add( new FSDir(new File(dir,
> DataStorage.BLOCK_SUBDIR_PREFIX+idx)));
> }catch(Exception e){
> }
> children = childrenList.toArray();
> }
> }
> ----------------------------
> bad consequence , in my cluster ,this datanode's num blocks became 0 .
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