83 lines
2.8 KiB
Ruby
83 lines
2.8 KiB
Ruby
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# Set in_memory=true and blockcache=true on catalog tables.
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# The .META. and -ROOT- tables can be created with caching and
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# in_memory set to false. You want them set to true so that
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# these hot tables make it into cache. To see if the
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# .META. table has BLOCKCACHE set, in the shell do the following:
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#
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# hbase> scan '-ROOT-'
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#
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# Look for the 'info' column family. See if BLOCKCACHE => 'true'?
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# If not, run this script and it will set the value to true.
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# Setting cache to 'true' will only take effect on region restart
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# of if you close the .META. region -- *disruptive* -- and have
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# it deploy elsewhere. This script runs against an up and running
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# hbase instance.
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#
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# To see usage for this script, run:
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#
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# ${HBASE_HOME}/bin/hbase org.jruby.Main set_meta_block_caching.rb
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#
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include Java
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import org.apache.hadoop.hbase.util.Bytes
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import org.apache.hadoop.hbase.HConstants
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import org.apache.hadoop.hbase.HRegionInfo
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import org.apache.hadoop.hbase.client.HTable
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import org.apache.hadoop.hbase.client.Delete
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import org.apache.hadoop.hbase.client.Put
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import org.apache.hadoop.hbase.client.Scan
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import org.apache.hadoop.hbase.HTableDescriptor
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import org.apache.hadoop.hbase.HBaseConfiguration
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import org.apache.hadoop.hbase.util.FSUtils
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import org.apache.hadoop.hbase.util.Writables
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import org.apache.hadoop.fs.Path
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import org.apache.hadoop.fs.FileSystem
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import org.apache.commons.logging.LogFactory
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# Name of this script
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NAME = "set_meta_block_caching.rb"
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# Print usage for this script
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def usage
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puts 'Usage: %s.rb]' % NAME
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exit!
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end
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# Get configuration to use.
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c = HBaseConfiguration.new()
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# Set hadoop filesystem configuration using the hbase.rootdir.
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# Otherwise, we'll always use localhost though the hbase.rootdir
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# might be pointing at hdfs location.
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c.set("fs.default.name", c.get(HConstants::HBASE_DIR))
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fs = FileSystem.get(c)
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# Get a logger and a metautils instance.
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LOG = LogFactory.getLog(NAME)
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# Check arguments
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if ARGV.size > 0
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usage
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end
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# Clean mentions of table from .META.
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# Scan the .META. and remove all lines that begin with tablename
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metaTable = HTable.new(c, HConstants::ROOT_TABLE_NAME)
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scan = Scan.new()
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scan.addColumn(HConstants::CATALOG_FAMILY, HConstants::REGIONINFO_QUALIFIER);
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scanner = metaTable.getScanner(scan)
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while (result = scanner.next())
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rowid = Bytes.toString(result.getRow())
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rowidStr = java.lang.String.new(rowid)
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LOG.info("Setting BLOCKCACHE and IN_MEMORY on: " + rowidStr);
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hriValue = result.getValue(HConstants::CATALOG_FAMILY, HConstants::REGIONINFO_QUALIFIER)
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hri = Writables.getHRegionInfo(hriValue)
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family = hri.getTableDesc().getFamily(HConstants::CATALOG_FAMILY)
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family.setBlockCacheEnabled(true)
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family.setInMemory(true)
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p = Put.new(result.getRow())
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p.add(HConstants::CATALOG_FAMILY, HConstants::REGIONINFO_QUALIFIER, Writables.getBytes(hri));
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metaTable.put(p)
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end
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scanner.close()
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