怎么在Hadoop+HBase上安裝snappy

這篇文章主要介紹“怎么在Hadoop+HBase上安裝snappy ”，在日常操作中，相信很多人在怎么在Hadoop+HBase上安裝snappy 問題上存在疑惑，小編查閱了各式資料，整理出簡單好用的操作方法，希望對大家解答”怎么在Hadoop+HBase上安裝snappy ”的疑惑有所幫助！接下來，請跟著小編一起來學習吧！

1、檢查snappy壓縮包是否安裝

命令為：bin/hbase org.apache.hadoop.hbase.util.CompressionTest file:///tmp/test.txt snappy

如果顯示信息為：

12/12/03 10:30:02 WARN metrics.SchemaConfigured: Could not determine table and column family of the HFile path file:/tmp/test.txt. Expecting at least 5 path components.
12/12/03 10:30:02 WARN snappy.LoadSnappy: Snappy native library not loaded
Exception in thread "main" java.lang.RuntimeException: native snappy library not available
     at org.apache.hadoop.io.compress.SnappyCodec.getCompressorType(SnappyCodec.java:123)
     at org.apache.hadoop.io.compress.CodecPool.getCompressor(CodecPool.java:100)
     at org.apache.hadoop.io.compress.CodecPool.getCompressor(CodecPool.java:112)
     at org.apache.hadoop.hbase.io.hfile.Compression$Algorithm.getCompressor(Compression.java:264)
     at org.apache.hadoop.hbase.io.hfile.HFileBlock$Writer.<init>(HFileBlock.java:739)
     at org.apache.hadoop.hbase.io.hfile.HFileWriterV2.finishInit(HFileWriterV2.java:127)
     at org.apache.hadoop.hbase.io.hfile.HFileWriterV2.<init>(HFileWriterV2.java:118)
     at org.apache.hadoop.hbase.io.hfile.HFileWriterV2$WriterFactoryV2.createWriter(HFileWriterV2.java:101)
     at org.apache.hadoop.hbase.io.hfile.HFile$WriterFactory.create(HFile.java:394)
     at org.apache.hadoop.hbase.util.CompressionTest.doSmokeTest(CompressionTest.java:108)

 則說明snappy壓縮包沒有安裝；

2、下載snappy-*.tar.gz壓縮包(只要和hbase版本兼容就可以，我的是snappy-1.1.1.tar.gz)，解壓；

3、進入snappy目錄，進行編譯，兩條命令：

      ./configure

       make

4、make完之后會產生一個libsnappy.so文件(這就是我們所需要的庫！！！)，正常情況下出現在當前目錄./libs/libsnappy.so，但是很多時候不按套路出牌，跑到別的文件夾下了，如果make沒有出錯，可以在根目錄search一下，肯定能找到這個文件；

5、將生成的這個libsnappy.so拷貝到HBase的lib/native/Linux-ARCH目錄下，ARCH代表 amd64 或 i386-32，注意，對于amd64的HBase可能沒有這個目錄，此時，需要手動創建：

     mkdir /opt/hbase-0.98.6.1/lib/native/Linux-amd64-64

6、如果還是不確定HBase在哪里查找lib，那么可以修改log4j文件中的日志級別(log level)進行調試；

7、重新運行第1步中的命令，現在看到的信息應該為：

12/12/03 10:34:35 INFO util.ChecksumType: Checksum can use java.util.zip.CRC32
12/12/03 10:34:35 INFO util.ChecksumType: org.apache.hadoop.util.PureJavaCrc32C not available. 
12/12/03 10:34:35 DEBUG util.FSUtils: Creating file:file:/tmp/test.txtwith permission:rwxrwxrwx
12/12/03 10:34:35 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
12/12/03 10:34:35 WARN metrics.SchemaConfigured: Could not determine table and column family of the HFile path file:/tmp/test.txt. Expecting at least 5 path components.
12/12/03 10:34:35 WARN snappy.LoadSnappy: Snappy native library is available
12/12/03 10:34:35 WARN snappy.LoadSnappy: Snappy native library not loaded
Exception in thread "main" java.lang.RuntimeException: native snappy library not available
    at org.apache.hadoop.io.compress.SnappyCodec.getCompressorType(SnappyCodec.java:123)
    at org.apache.hadoop.io.compress.CodecPool.getCompressor(CodecPool.java:100)
    at org.apache.hadoop.io.compress.CodecPool.getCompressor(CodecPool.java:112)
    at org.apache.hadoop.hbase.io.hfile.Compression$Algorithm.getCompressor(Compression.java:264)
    at org.apache.hadoop.hbase.io.hfile.HFileBlock$Writer.<init>(HFileBlock.java:739)
    at org.apache.hadoop.hbase.io.hfile.HFileWriterV2.finishInit(HFileWriterV2.java:127)
    at org.apache.hadoop.hbase.io.hfile.HFileWriterV2.<init>(HFileWriterV2.java:118)
    at org.apache.hadoop.hbase.io.hfile.HFileWriterV2$WriterFactoryV2.createWriter(HFileWriterV2.java:101)
    at org.apache.hadoop.hbase.io.hfile.HFile$WriterFactory.create(HFile.java:394)
    at org.apache.hadoop.hbase.util.CompressionTest.doSmokeTest(CompressionTest.java:108)
    at org.apache.hadoop.hbase.util.CompressionTest.main(CompressionTest.java:138)

8、可以看到，snappy已經可以找到了，但是還沒有加載(not loaded)。想加載的話，還需要拷貝hadoop的本地庫到與libsnappy.so同一個路徑下，hadoop的本地庫路徑為：

      hadoop-1.2.1/lib/native/Linux-ARCH/libhadoop.so；

       如果這個路徑下沒有，可以根據所使用的hadoop版本到 https://archive.apache.org/dist/hadoop/core/ 下載相應的tar.gz包，解壓之后就能找到所需要的文件了；

9、再次運行測試命令(第1步中的命令)，可以得到：

12/12/03 10:37:48 INFO util.ChecksumType: org.apache.hadoop.util.PureJavaCrc32 not available.
12/12/03 10:37:48 INFO util.ChecksumType: Checksum can use java.util.zip.CRC32
12/12/03 10:37:48 INFO util.ChecksumType: org.apache.hadoop.util.PureJavaCrc32C not available. 
12/12/03 10:37:48 DEBUG util.FSUtils: Creating file:file:/tmp/test.txtwith permission:rwxrwxrwx
12/12/03 10:37:48 INFO util.NativeCodeLoader: Loaded the native-hadoop library
12/12/03 10:37:48 WARN metrics.SchemaConfigured: Could not determine table and column family of the HFile path file:/tmp/test.txt. Expecting at least 5 path components.
12/12/03 10:37:48 WARN snappy.LoadSnappy: Snappy native library is available
12/12/03 10:37:48 INFO snappy.LoadSnappy: Snappy native library loaded
12/12/03 10:37:48 INFO compress.CodecPool: Got brand-new compressor
12/12/03 10:37:48 DEBUG hfile.HFileWriterV2: Initialized with CacheConfig:disabled
12/12/03 10:37:49 WARN metrics.SchemaConfigured: Could not determine table and column family of the HFile path file:/tmp/test.txt. Expecting at least 5 path components.
12/12/03 10:37:49 INFO compress.CodecPool: Got brand-new decompressor
SUCCESS

      看到SUCCESS，說明安裝成功，snappy壓縮包可以使用，搞定。

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