[120] | 1 | <html> |
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| 2 | <body> |
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| 3 | <table border="1"> |
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| 4 | <tr> |
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| 5 | <td>name</td><td>value</td><td>description</td> |
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| 6 | </tr> |
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| 7 | <tr> |
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| 8 | <td><a name="hadoop.tmp.dir">hadoop.tmp.dir</a></td><td>/tmp/hadoop-${user.name}</td><td>A base for other temporary directories.</td> |
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| 9 | </tr> |
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| 10 | <tr> |
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| 11 | <td><a name="hadoop.native.lib">hadoop.native.lib</a></td><td>true</td><td>Should native hadoop libraries, if present, be used.</td> |
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| 12 | </tr> |
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| 13 | <tr> |
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| 14 | <td><a name="hadoop.http.filter.initializers">hadoop.http.filter.initializers</a></td><td></td><td>A comma separated list of class names. Each class in the list |
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| 15 | must extend org.apache.hadoop.http.FilterInitializer. The corresponding |
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| 16 | Filter will be initialized. Then, the Filter will be applied to all user |
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| 17 | facing jsp and servlet web pages. The ordering of the list defines the |
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| 18 | ordering of the filters.</td> |
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| 19 | </tr> |
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| 20 | <tr> |
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| 21 | <td><a name="hadoop.security.authorization">hadoop.security.authorization</a></td><td>false</td><td>Is service-level authorization enabled?</td> |
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| 22 | </tr> |
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| 23 | <tr> |
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| 24 | <td><a name="hadoop.logfile.size">hadoop.logfile.size</a></td><td>10000000</td><td>The max size of each log file</td> |
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| 25 | </tr> |
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| 26 | <tr> |
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| 27 | <td><a name="hadoop.logfile.count">hadoop.logfile.count</a></td><td>10</td><td>The max number of log files</td> |
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| 28 | </tr> |
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| 29 | <tr> |
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| 30 | <td><a name="io.file.buffer.size">io.file.buffer.size</a></td><td>4096</td><td>The size of buffer for use in sequence files. |
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| 31 | The size of this buffer should probably be a multiple of hardware |
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| 32 | page size (4096 on Intel x86), and it determines how much data is |
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| 33 | buffered during read and write operations.</td> |
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| 34 | </tr> |
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| 35 | <tr> |
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| 36 | <td><a name="io.bytes.per.checksum">io.bytes.per.checksum</a></td><td>512</td><td>The number of bytes per checksum. Must not be larger than |
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| 37 | io.file.buffer.size.</td> |
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| 38 | </tr> |
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| 39 | <tr> |
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| 40 | <td><a name="io.skip.checksum.errors">io.skip.checksum.errors</a></td><td>false</td><td>If true, when a checksum error is encountered while |
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| 41 | reading a sequence file, entries are skipped, instead of throwing an |
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| 42 | exception.</td> |
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| 43 | </tr> |
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| 44 | <tr> |
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| 45 | <td><a name="io.compression.codecs">io.compression.codecs</a></td><td>org.apache.hadoop.io.compress.DefaultCodec,org.apache.hadoop.io.compress.GzipCodec,org.apache.hadoop.io.compress.BZip2Codec</td><td>A list of the compression codec classes that can be used |
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| 46 | for compression/decompression.</td> |
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| 47 | </tr> |
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| 48 | <tr> |
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| 49 | <td><a name="io.serializations">io.serializations</a></td><td>org.apache.hadoop.io.serializer.WritableSerialization</td><td>A list of serialization classes that can be used for |
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| 50 | obtaining serializers and deserializers.</td> |
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| 51 | </tr> |
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| 52 | <tr> |
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| 53 | <td><a name="fs.default.name">fs.default.name</a></td><td>file:///</td><td>The name of the default file system. A URI whose |
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| 54 | scheme and authority determine the FileSystem implementation. The |
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| 55 | uri's scheme determines the config property (fs.SCHEME.impl) naming |
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| 56 | the FileSystem implementation class. The uri's authority is used to |
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| 57 | determine the host, port, etc. for a filesystem.</td> |
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| 58 | </tr> |
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| 59 | <tr> |
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| 60 | <td><a name="fs.trash.interval">fs.trash.interval</a></td><td>0</td><td>Number of minutes between trash checkpoints. |
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| 61 | If zero, the trash feature is disabled. |
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| 62 | </td> |
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| 63 | </tr> |
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| 64 | <tr> |
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| 65 | <td><a name="fs.file.impl">fs.file.impl</a></td><td>org.apache.hadoop.fs.LocalFileSystem</td><td>The FileSystem for file: uris.</td> |
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| 66 | </tr> |
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| 67 | <tr> |
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| 68 | <td><a name="fs.hdfs.impl">fs.hdfs.impl</a></td><td>org.apache.hadoop.hdfs.DistributedFileSystem</td><td>The FileSystem for hdfs: uris.</td> |
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| 69 | </tr> |
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| 70 | <tr> |
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| 71 | <td><a name="fs.s3.impl">fs.s3.impl</a></td><td>org.apache.hadoop.fs.s3.S3FileSystem</td><td>The FileSystem for s3: uris.</td> |
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| 72 | </tr> |
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| 73 | <tr> |
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| 74 | <td><a name="fs.s3n.impl">fs.s3n.impl</a></td><td>org.apache.hadoop.fs.s3native.NativeS3FileSystem</td><td>The FileSystem for s3n: (Native S3) uris.</td> |
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| 75 | </tr> |
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| 76 | <tr> |
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| 77 | <td><a name="fs.kfs.impl">fs.kfs.impl</a></td><td>org.apache.hadoop.fs.kfs.KosmosFileSystem</td><td>The FileSystem for kfs: uris.</td> |
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| 78 | </tr> |
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| 79 | <tr> |
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| 80 | <td><a name="fs.hftp.impl">fs.hftp.impl</a></td><td>org.apache.hadoop.hdfs.HftpFileSystem</td><td></td> |
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| 81 | </tr> |
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| 82 | <tr> |
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| 83 | <td><a name="fs.hsftp.impl">fs.hsftp.impl</a></td><td>org.apache.hadoop.hdfs.HsftpFileSystem</td><td></td> |
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| 84 | </tr> |
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| 85 | <tr> |
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| 86 | <td><a name="fs.ftp.impl">fs.ftp.impl</a></td><td>org.apache.hadoop.fs.ftp.FTPFileSystem</td><td>The FileSystem for ftp: uris.</td> |
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| 87 | </tr> |
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| 88 | <tr> |
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| 89 | <td><a name="fs.ramfs.impl">fs.ramfs.impl</a></td><td>org.apache.hadoop.fs.InMemoryFileSystem</td><td>The FileSystem for ramfs: uris.</td> |
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| 90 | </tr> |
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| 91 | <tr> |
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| 92 | <td><a name="fs.har.impl">fs.har.impl</a></td><td>org.apache.hadoop.fs.HarFileSystem</td><td>The filesystem for Hadoop archives. </td> |
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| 93 | </tr> |
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| 94 | <tr> |
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| 95 | <td><a name="fs.checkpoint.dir">fs.checkpoint.dir</a></td><td>${hadoop.tmp.dir}/dfs/namesecondary</td><td>Determines where on the local filesystem the DFS secondary |
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| 96 | name node should store the temporary images to merge. |
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| 97 | If this is a comma-delimited list of directories then the image is |
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| 98 | replicated in all of the directories for redundancy. |
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| 99 | </td> |
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| 100 | </tr> |
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| 101 | <tr> |
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| 102 | <td><a name="fs.checkpoint.edits.dir">fs.checkpoint.edits.dir</a></td><td>${fs.checkpoint.dir}</td><td>Determines where on the local filesystem the DFS secondary |
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| 103 | name node should store the temporary edits to merge. |
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| 104 | If this is a comma-delimited list of directoires then teh edits is |
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| 105 | replicated in all of the directoires for redundancy. |
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| 106 | Default value is same as fs.checkpoint.dir |
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| 107 | </td> |
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| 108 | </tr> |
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| 109 | <tr> |
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| 110 | <td><a name="fs.checkpoint.period">fs.checkpoint.period</a></td><td>3600</td><td>The number of seconds between two periodic checkpoints. |
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| 111 | </td> |
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| 112 | </tr> |
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| 113 | <tr> |
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| 114 | <td><a name="fs.checkpoint.size">fs.checkpoint.size</a></td><td>67108864</td><td>The size of the current edit log (in bytes) that triggers |
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| 115 | a periodic checkpoint even if the fs.checkpoint.period hasn't expired. |
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| 116 | </td> |
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| 117 | </tr> |
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| 118 | <tr> |
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| 119 | <td><a name="fs.s3.block.size">fs.s3.block.size</a></td><td>67108864</td><td>Block size to use when writing files to S3.</td> |
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| 120 | </tr> |
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| 121 | <tr> |
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| 122 | <td><a name="fs.s3.buffer.dir">fs.s3.buffer.dir</a></td><td>${hadoop.tmp.dir}/s3</td><td>Determines where on the local filesystem the S3 filesystem |
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| 123 | should store files before sending them to S3 |
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| 124 | (or after retrieving them from S3). |
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| 125 | </td> |
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| 126 | </tr> |
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| 127 | <tr> |
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| 128 | <td><a name="fs.s3.maxRetries">fs.s3.maxRetries</a></td><td>4</td><td>The maximum number of retries for reading or writing files to S3, |
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| 129 | before we signal failure to the application. |
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| 130 | </td> |
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| 131 | </tr> |
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| 132 | <tr> |
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| 133 | <td><a name="fs.s3.sleepTimeSeconds">fs.s3.sleepTimeSeconds</a></td><td>10</td><td>The number of seconds to sleep between each S3 retry. |
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| 134 | </td> |
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| 135 | </tr> |
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| 136 | <tr> |
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| 137 | <td><a name="local.cache.size">local.cache.size</a></td><td>10737418240</td><td>The limit on the size of cache you want to keep, set by default |
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| 138 | to 10GB. This will act as a soft limit on the cache directory for out of band data. |
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| 139 | </td> |
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| 140 | </tr> |
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| 141 | <tr> |
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| 142 | <td><a name="io.seqfile.compress.blocksize">io.seqfile.compress.blocksize</a></td><td>1000000</td><td>The minimum block size for compression in block compressed |
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| 143 | SequenceFiles. |
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| 144 | </td> |
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| 145 | </tr> |
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| 146 | <tr> |
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| 147 | <td><a name="io.seqfile.lazydecompress">io.seqfile.lazydecompress</a></td><td>true</td><td>Should values of block-compressed SequenceFiles be decompressed |
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| 148 | only when necessary. |
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| 149 | </td> |
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| 150 | </tr> |
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| 151 | <tr> |
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| 152 | <td><a name="io.seqfile.sorter.recordlimit">io.seqfile.sorter.recordlimit</a></td><td>1000000</td><td>The limit on number of records to be kept in memory in a spill |
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| 153 | in SequenceFiles.Sorter |
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| 154 | </td> |
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| 155 | </tr> |
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| 156 | <tr> |
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| 157 | <td><a name="io.mapfile.bloom.size">io.mapfile.bloom.size</a></td><td>1048576</td><td>The size of BloomFilter-s used in BloomMapFile. Each time this many |
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| 158 | keys is appended the next BloomFilter will be created (inside a DynamicBloomFilter). |
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| 159 | Larger values minimize the number of filters, which slightly increases the performance, |
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| 160 | but may waste too much space if the total number of keys is usually much smaller |
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| 161 | than this number. |
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| 162 | </td> |
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| 163 | </tr> |
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| 164 | <tr> |
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| 165 | <td><a name="io.mapfile.bloom.error.rate">io.mapfile.bloom.error.rate</a></td><td>0.005</td><td>The rate of false positives in BloomFilter-s used in BloomMapFile. |
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| 166 | As this value decreases, the size of BloomFilter-s increases exponentially. This |
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| 167 | value is the probability of encountering false positives (default is 0.5%). |
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| 168 | </td> |
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| 169 | </tr> |
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| 170 | <tr> |
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| 171 | <td><a name="hadoop.util.hash.type">hadoop.util.hash.type</a></td><td>murmur</td><td>The default implementation of Hash. Currently this can take one of the |
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| 172 | two values: 'murmur' to select MurmurHash and 'jenkins' to select JenkinsHash. |
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| 173 | </td> |
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| 174 | </tr> |
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| 175 | <tr> |
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| 176 | <td><a name="ipc.client.idlethreshold">ipc.client.idlethreshold</a></td><td>4000</td><td>Defines the threshold number of connections after which |
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| 177 | connections will be inspected for idleness. |
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| 178 | </td> |
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| 179 | </tr> |
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| 180 | <tr> |
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| 181 | <td><a name="ipc.client.kill.max">ipc.client.kill.max</a></td><td>10</td><td>Defines the maximum number of clients to disconnect in one go. |
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| 182 | </td> |
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| 183 | </tr> |
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| 184 | <tr> |
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| 185 | <td><a name="ipc.client.connection.maxidletime">ipc.client.connection.maxidletime</a></td><td>10000</td><td>The maximum time in msec after which a client will bring down the |
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| 186 | connection to the server. |
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| 187 | </td> |
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| 188 | </tr> |
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| 189 | <tr> |
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| 190 | <td><a name="ipc.client.connect.max.retries">ipc.client.connect.max.retries</a></td><td>10</td><td>Indicates the number of retries a client will make to establish |
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| 191 | a server connection. |
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| 192 | </td> |
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| 193 | </tr> |
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| 194 | <tr> |
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| 195 | <td><a name="ipc.server.listen.queue.size">ipc.server.listen.queue.size</a></td><td>128</td><td>Indicates the length of the listen queue for servers accepting |
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| 196 | client connections. |
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| 197 | </td> |
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| 198 | </tr> |
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| 199 | <tr> |
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| 200 | <td><a name="ipc.server.tcpnodelay">ipc.server.tcpnodelay</a></td><td>false</td><td>Turn on/off Nagle's algorithm for the TCP socket connection on |
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| 201 | the server. Setting to true disables the algorithm and may decrease latency |
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| 202 | with a cost of more/smaller packets. |
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| 203 | </td> |
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| 204 | </tr> |
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| 205 | <tr> |
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| 206 | <td><a name="ipc.client.tcpnodelay">ipc.client.tcpnodelay</a></td><td>false</td><td>Turn on/off Nagle's algorithm for the TCP socket connection on |
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| 207 | the client. Setting to true disables the algorithm and may decrease latency |
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| 208 | with a cost of more/smaller packets. |
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| 209 | </td> |
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| 210 | </tr> |
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| 211 | <tr> |
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| 212 | <td><a name="webinterface.private.actions">webinterface.private.actions</a></td><td>false</td><td> If set to true, the web interfaces of JT and NN may contain |
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| 213 | actions, such as kill job, delete file, etc., that should |
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| 214 | not be exposed to public. Enable this option if the interfaces |
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| 215 | are only reachable by those who have the right authorization. |
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| 216 | </td> |
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| 217 | </tr> |
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| 218 | <tr> |
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| 219 | <td><a name="hadoop.rpc.socket.factory.class.default">hadoop.rpc.socket.factory.class.default</a></td><td>org.apache.hadoop.net.StandardSocketFactory</td><td> Default SocketFactory to use. This parameter is expected to be |
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| 220 | formatted as "package.FactoryClassName". |
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| 221 | </td> |
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| 222 | </tr> |
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| 223 | <tr> |
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| 224 | <td><a name="hadoop.rpc.socket.factory.class.ClientProtocol">hadoop.rpc.socket.factory.class.ClientProtocol</a></td><td></td><td> SocketFactory to use to connect to a DFS. If null or empty, use |
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| 225 | hadoop.rpc.socket.class.default. This socket factory is also used by |
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| 226 | DFSClient to create sockets to DataNodes. |
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| 227 | </td> |
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| 228 | </tr> |
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| 229 | <tr> |
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| 230 | <td><a name="hadoop.socks.server">hadoop.socks.server</a></td><td></td><td> Address (host:port) of the SOCKS server to be used by the |
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| 231 | SocksSocketFactory. |
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| 232 | </td> |
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| 233 | </tr> |
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| 234 | <tr> |
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| 235 | <td><a name="topology.node.switch.mapping.impl">topology.node.switch.mapping.impl</a></td><td>org.apache.hadoop.net.ScriptBasedMapping</td><td> The default implementation of the DNSToSwitchMapping. It |
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| 236 | invokes a script specified in topology.script.file.name to resolve |
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| 237 | node names. If the value for topology.script.file.name is not set, the |
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| 238 | default value of DEFAULT_RACK is returned for all node names. |
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| 239 | </td> |
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| 240 | </tr> |
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| 241 | <tr> |
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| 242 | <td><a name="topology.script.file.name">topology.script.file.name</a></td><td></td><td> The script name that should be invoked to resolve DNS names to |
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| 243 | NetworkTopology names. Example: the script would take host.foo.bar as an |
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| 244 | argument, and return /rack1 as the output. |
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| 245 | </td> |
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| 246 | </tr> |
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| 247 | <tr> |
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| 248 | <td><a name="topology.script.number.args">topology.script.number.args</a></td><td>100</td><td> The max number of args that the script configured with |
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| 249 | topology.script.file.name should be run with. Each arg is an |
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| 250 | IP address. |
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| 251 | </td> |
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| 252 | </tr> |
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| 253 | </table> |
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| 254 | </body> |
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| 255 | </html> |
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