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The following commit(s) were added to refs/heads/trunk by this push:
new 4a0b7f7 HDFS-15384. Document getLocatedBlocks(String src, long start)
of DFSClient only return partial blocks. Contributed by Yang Yun.
4a0b7f7 is described below
commit 4a0b7f7ebe107e4124b2679a6e1b1450df66dd7e
Author: He Xiaoqiao <hexiaoq...@apache.org>
AuthorDate: Mon Mar 8 12:18:46 2021 +0800
HDFS-15384. Document getLocatedBlocks(String src, long start) of DFSClient
only return partial blocks. Contributed by Yang Yun.
---
.../src/main/java/org/apache/hadoop/hdfs/DFSClient.java | 12 ++++++++++++
1 file changed, 12 insertions(+)
diff --git
a/hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/DFSClient.java
b/hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/DFSClient.java
index c2b03cd..f568308 100755
---
a/hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/DFSClient.java
+++
b/hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/DFSClient.java
@@ -861,6 +861,18 @@ public class DFSClient implements java.io.Closeable,
RemotePeerFactory,
return dfsClientConf.getRefreshReadBlockLocationsMS();
}
+ /**
+ * Get locations of the blocks of the specified file `src` from offset
+ * `start` within the prefetch size which is related to parameter
+ * `dfs.client.read.prefetch.size`. DataNode locations for each block are
+ * sorted by the proximity to the client. Please note that the prefetch size
+ * is not equal file length generally.
+ *
+ * @param src the file path.
+ * @param start starting offset.
+ * @return LocatedBlocks
+ * @throws IOException
+ */
public LocatedBlocks getLocatedBlocks(String src, long start)
throws IOException {
return getLocatedBlocks(src, start, dfsClientConf.getPrefetchSize());
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