/**
* @param file the file the block belongs to
* @param readType the InStream's read type
* @param blockIndex the index of the block in the file
* @param ufsConf the under file system configuration
* @throws IOException
*/
RemoteBlockInStream(TachyonFile file, ReadType readType, int blockIndex, Object ufsConf)
throws IOException {
super(file, readType, blockIndex);
mBlockInfo = TFS.getClientBlockInfo(FILE.FID, BLOCK_INDEX);
mReadByte = 0;
mBufferStartPosition = 0;
if (!FILE.isComplete()) {
throw new IOException("File " + FILE.getPath() + " is not ready to read");
}
mRecache = readType.isCache();
if (mRecache) {
mBlockOutStream = new BlockOutStream(file, WriteType.TRY_CACHE, blockIndex);
}
updateCurrentBuffer();
mUFSConf = ufsConf;
if (mCurrentBuffer == null) {
setupStreamFromUnderFs(mBlockInfo.offset, mUFSConf);
if (mCheckpointInputStream == null) {
TFS.reportLostFile(FILE.FID);
throw new IOException("Can not find the block " + FILE + " " + BLOCK_INDEX);
}
}
}
private void updateCurrentBuffer() throws IOException {
long length = BUFFER_SIZE;
if (mBufferStartPosition + length > mBlockInfo.length) {
length = mBlockInfo.length - mBufferStartPosition;
}
LOG.info(
String.format(
"Try to find remote worker and read block %d from %d, with len %d",
mBlockInfo.blockId, mBufferStartPosition, length));
mCurrentBuffer = readRemoteByteBuffer(mBlockInfo, mBufferStartPosition, length);
if (mCurrentBuffer == null) {
mBlockInfo = TFS.getClientBlockInfo(FILE.FID, BLOCK_INDEX);
mCurrentBuffer = readRemoteByteBuffer(mBlockInfo, mBufferStartPosition, length);
}
}