/**
* Attempts to promote a block in Alluxio space. If the block is not present, this method will
* return without an error. If the block is present in multiple workers, only one worker will
* receive the promotion request.
*
* @param blockId the id of the block to promote
* @throws IOException if the block does not exist
*/
public void promote(long blockId) throws IOException {
BlockInfo info;
try (CloseableResource<BlockMasterClient> blockMasterClientResource =
mContext.acquireMasterClientResource()) {
info = blockMasterClientResource.get().getBlockInfo(blockId);
} catch (AlluxioException e) {
throw new IOException(e);
}
if (info.getLocations().isEmpty()) {
// Nothing to promote
return;
}
// Get the first worker address for now, as this will likely be the location being read from
// TODO(calvin): Get this location via a policy (possibly location is a parameter to promote)
WorkerNetAddress workerAddr = info.getLocations().get(0).getWorkerAddress();
BlockWorkerClient blockWorkerClient = mContext.acquireWorkerClient(workerAddr.getHost());
try {
blockWorkerClient.promoteBlock(blockId);
} catch (AlluxioException e) {
throw new IOException(e);
} finally {
mContext.releaseWorkerClient(blockWorkerClient);
}
}
