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new 809ae58e711c HADOOP-18982. Fix doc about loading native libraries.
(#6281). Contributed by Shuyan Zhang.
809ae58e711c is described below
commit 809ae58e711c23ea9d6d7fc43b925c09328c52fe
Author: zhangshuyan <81411509+zhangshuy...@users.noreply.github.com>
AuthorDate: Wed Dec 6 21:24:14 2023 +0800
HADOOP-18982. Fix doc about loading native libraries. (#6281). Contributed
by Shuyan Zhang.
Signed-off-by: He Xiaoqiao <hexiaoq...@apache.org>
---
.../hadoop-common/src/site/markdown/NativeLibraries.md.vm | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)
diff --git
a/hadoop-common-project/hadoop-common/src/site/markdown/NativeLibraries.md.vm
b/hadoop-common-project/hadoop-common/src/site/markdown/NativeLibraries.md.vm
index 1e62e94394f9..9756c42340da 100644
---
a/hadoop-common-project/hadoop-common/src/site/markdown/NativeLibraries.md.vm
+++
b/hadoop-common-project/hadoop-common/src/site/markdown/NativeLibraries.md.vm
@@ -126,10 +126,10 @@ Native Shared Libraries
You can load any native shared library using DistributedCache for distributing
and symlinking the library files.
-This example shows you how to distribute a shared library, mylib.so, and load
it from a MapReduce task.
+This example shows you how to distribute a shared library in Unix-like
systems, mylib.so, and load it from a MapReduce task.
-1. First copy the library to the HDFS: `bin/hadoop fs -copyFromLocal
mylib.so.1 /libraries/mylib.so.1`
-2. The job launching program should contain the following:
`DistributedCache.createSymlink(conf);`
`DistributedCache.addCacheFile("hdfs://host:port/libraries/mylib.so.
1#mylib.so", conf);`
-3. The MapReduce task can contain: `System.loadLibrary("mylib.so");`
+1. First copy the library to the HDFS: `bin/hadoop fs -copyFromLocal
libmyexample.so.1 /libraries/libmyexample.so.1`
+2. The job launching program should contain the following:
`DistributedCache.createSymlink(conf);`
`DistributedCache.addCacheFile("hdfs://host:port/libraries/libmyexample.so.1#libmyexample.so",
conf);`
+3. The MapReduce task can contain: `System.loadLibrary("myexample");`
Note: If you downloaded or built the native hadoop library, you don’t need to
use DistibutedCache to make the library available to your MapReduce tasks.
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