private File addBlock(Block b, File src, boolean createOk, boolean resetIdx)
throws IOException {
if (numBlocks < maxBlocksPerDir) {
File dest = new File(dir, b.getBlockName());
File metaData = getMetaFile(src, b);
File newmeta = getMetaFile(dest, b);
if (!metaData.renameTo(newmeta) || !src.renameTo(dest)) {
throw new IOException(
"could not move files for " + b + " from tmp to " + dest.getAbsolutePath());
}
if (DataNode.LOG.isDebugEnabled()) {
DataNode.LOG.debug("addBlock: Moved " + metaData + " to " + newmeta);
DataNode.LOG.debug("addBlock: Moved " + src + " to " + dest);
}
numBlocks += 1;
return dest;
}
if (lastChildIdx < 0 && resetIdx) {
// reset so that all children will be checked
lastChildIdx = random.nextInt(children.length);
}
if (lastChildIdx >= 0 && children != null) {
// Check if any child-tree has room for a block.
for (int i = 0; i < children.length; i++) {
int idx = (lastChildIdx + i) % children.length;
File file = children[idx].addBlock(b, src, false, resetIdx);
if (file != null) {
lastChildIdx = idx;
return file;
}
}
lastChildIdx = -1;
}
if (!createOk) {
return null;
}
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));
}
}
// now pick a child randomly for creating a new set of subdirs.
lastChildIdx = random.nextInt(children.length);
return children[lastChildIdx].addBlock(b, src, true, false);
}
/** Return the block file for the given ID */
public File findBlockFile(long blockId) {
final Block b = new Block(blockId);
File blockfile = null;
ActiveFile activefile = ongoingCreates.get(b);
if (activefile != null) {
blockfile = activefile.file;
}
if (blockfile == null) {
blockfile = getFile(b);
}
if (blockfile == null) {
if (DataNode.LOG.isDebugEnabled()) {
DataNode.LOG.debug("ongoingCreates=" + ongoingCreates);
DataNode.LOG.debug("volumeMap=" + volumeMap);
}
}
return blockfile;
}