new HashMap<LocatedBlock, List<VolumeId>>();
for (LocatedBlock b : blocks) {
ArrayList<VolumeId> l = new ArrayList<VolumeId>(b.getLocations().length);
// Start off all IDs as invalid, fill it in later with results from RPCs
for (int i = 0; i < b.getLocations().length; i++) {
l.add(new HdfsVolumeId(null, false));
}
blockVolumeIds.put(b, l);
}
// Iterate through the list of metadatas (one per datanode).
// For each metadata, if it's valid, insert its volume location information
// into the Map returned to the caller
Iterator<HdfsBlocksMetadata> metadatasIter = metadatas.iterator();
Iterator<DatanodeInfo> datanodeIter = datanodeBlocks.keySet().iterator();
while (metadatasIter.hasNext()) {
HdfsBlocksMetadata metadata = metadatasIter.next();
DatanodeInfo datanode = datanodeIter.next();
// Check if metadata is valid
if (metadata == null) {
continue;
}
ExtendedBlock[] metaBlocks = metadata.getBlocks();
List<byte[]> metaVolumeIds = metadata.getVolumeIds();
List<Integer> metaVolumeIndexes = metadata.getVolumeIndexes();
// Add VolumeId for each replica in the HdfsBlocksMetadata
for (int j = 0; j < metaBlocks.length; j++) {
int volumeIndex = metaVolumeIndexes.get(j);
ExtendedBlock extBlock = metaBlocks[j];
// Skip if block wasn't found, or not a valid index into metaVolumeIds
// Also skip if the DN responded with a block we didn't ask for
if (volumeIndex == Integer.MAX_VALUE
|| volumeIndex >= metaVolumeIds.size()
|| !extBlockToLocBlock.containsKey(extBlock)) {
continue;
}
// Get the VolumeId by indexing into the list of VolumeIds
// provided by the datanode
byte[] volumeId = metaVolumeIds.get(volumeIndex);
HdfsVolumeId id = new HdfsVolumeId(volumeId, true);
// Find out which index we are in the LocatedBlock's replicas
LocatedBlock locBlock = extBlockToLocBlock.get(extBlock);
DatanodeInfo[] dnInfos = locBlock.getLocations();
int index = -1;
for (int k = 0; k < dnInfos.length; k++) {