HDFS-15384. Document getLocatedBlocks(String src, long start) of DFSClient only return partial blocks. Contributed by Yang Yun.
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@ -861,6 +861,18 @@ public class DFSClient implements java.io.Closeable, RemotePeerFactory,
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return dfsClientConf.getRefreshReadBlockLocationsMS();
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}
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/**
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* Get locations of the blocks of the specified file `src` from offset
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* `start` within the prefetch size which is related to parameter
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* `dfs.client.read.prefetch.size`. DataNode locations for each block are
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* sorted by the proximity to the client. Please note that the prefetch size
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* is not equal file length generally.
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*
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* @param src the file path.
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* @param start starting offset.
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* @return LocatedBlocks
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* @throws IOException
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*/
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public LocatedBlocks getLocatedBlocks(String src, long start)
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throws IOException {
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return getLocatedBlocks(src, start, dfsClientConf.getPrefetchSize());
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