/**
* Maps list by node ID.
*
* @param subgrid Subgrid.
* @return Map.
*/
private Map<UUID, GridNode> mapSubgrid(Collection<GridNode> subgrid) {
Map<UUID, GridNode> res = U.newHashMap(subgrid.size());
for (GridNode node : subgrid) res.put(node.id(), node);
return res;
}
/** {@inheritDoc} */
@Nullable
@Override
public final Map<? extends GridComputeJob, GridNode> map(
List<GridNode> subgrid, @Nullable GridGgfsTaskArgs<T> args) throws GridException {
assert grid != null;
assert args != null;
GridGgfs ggfs = grid.ggfs(args.ggfsName());
GridGgfsProcessorAdapter ggfsProc = ((GridKernal) grid).context().ggfs();
Map<GridComputeJob, GridNode> splitMap = new HashMap<>();
Map<UUID, GridNode> nodes = mapSubgrid(subgrid);
for (GridGgfsPath path : args.paths()) {
GridGgfsFile file = ggfs.info(path);
if (file == null) {
if (args.skipNonExistentFiles()) continue;
else
throw new GridException("Failed to process GGFS file because it doesn't exist: " + path);
}
Collection<GridGgfsBlockLocation> aff =
ggfs.affinity(path, 0, file.length(), args.maxRangeLength());
long totalLen = 0;
for (GridGgfsBlockLocation loc : aff) {
GridNode node = null;
for (UUID nodeId : loc.nodeIds()) {
node = nodes.get(nodeId);
if (node != null) break;
}
if (node == null)
throw new GridException(
"Failed to find any of block affinity nodes in subgrid [loc="
+ loc
+ ", subgrid="
+ subgrid
+ ']');
GridGgfsJob job =
createJob(path, new GridGgfsFileRange(file.path(), loc.start(), loc.length()), args);
if (job != null) {
GridComputeJob jobImpl =
ggfsProc.createJob(
job, ggfs.name(), file.path(), loc.start(), loc.length(), args.recordResolver());
splitMap.put(jobImpl, node);
}
totalLen += loc.length();
}
assert totalLen == file.length();
}
return splitMap;
}