HBASE-7 Provide a HBase checker and repair tool similar to fsck; added simple .META. fixup script
git-svn-id: https://svn.apache.org/repos/asf/hbase/trunk@947857 13f79535-47bb-0310-9956-ffa450edef68
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Michael Stack
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# Script looks at hbase .META. table verifying its content is coherent.
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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 check_meta.rb --help
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#
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# Copyright 2010 The Apache Software Foundation
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#
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# Licensed to the Apache Software Foundation (ASF) under one
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# or more contributor license agreements. See the NOTICE file
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# distributed with this work for additional information
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# regarding copyright ownership. The ASF licenses this file
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# to you under the Apache License, Version 2.0 (the
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# "License"); you may not use this file except in compliance
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# with the License. You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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#
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include Java
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import org.apache.commons.logging.LogFactory
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import org.apache.hadoop.hbase.util.VersionInfo
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import org.apache.hadoop.hbase.HBaseConfiguration
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import org.apache.hadoop.fs.FileSystem
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import org.apache.hadoop.fs.Path
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import org.apache.hadoop.hbase.HConstants
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import org.apache.hadoop.hbase.util.FSUtils
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import org.apache.hadoop.hbase.client.HTable
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import org.apache.hadoop.hbase.client.Scan
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import org.apache.hadoop.hbase.util.Writables
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import org.apache.hadoop.hbase.HRegionInfo
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import org.apache.hadoop.hbase.util.Bytes
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import org.apache.hadoop.hbase.HTableDescriptor
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import org.apache.hadoop.hbase.client.Put
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# Name of this script
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NAME = 'check_meta'
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# Print usage for this script
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def usage
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puts 'Usage: %s.rb [--fix]' % NAME
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puts ' fix Try to fixup meta issues'
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puts 'Script checks consistency of the .META. table. It reports if .META. has missing entries.'
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puts 'If you pass "--fix", it will try looking in the filesystem for the dropped region and if it'
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puts 'finds a likely candidate, it will try pluggin the .META. hole.'
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exit!
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end
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def isFixup
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# Are we to do fixup during this run
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usage if ARGV.size > 1
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fixup = nil
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if ARGV.size == 1
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usage unless ARGV[0].downcase.match('--fix.*')
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fixup = 1
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end
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return fixup
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end
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def getConfiguration
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hbase_twenty = VersionInfo.getVersion().match('0\.20\..*')
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# Get configuration to use.
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if hbase_twenty
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c = HBaseConfiguration.new()
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else
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c = HBaseConfiguration.create()
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end
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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. Do old and new key for fs.
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c.set("fs.default.name", c.get(HConstants::HBASE_DIR))
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c.set("fs.defaultFS", c.get(HConstants::HBASE_DIR))
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return c
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end
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def fixup(leftEdge, rightEdge, metatable, fs, rootdir)
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plugged = nil
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# Try and fix the passed holes in meta.
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tabledir = HTableDescriptor::getTableDir(rootdir, leftEdge.getTableDesc().getName())
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statuses = fs.listStatus(tabledir)
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for status in statuses
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next unless status.isDir()
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next if status.getPath().getName() == "compaction.dir"
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regioninfofile = Path.new(status.getPath(), ".regioninfo")
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unless fs.exists(regioninfofile)
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LOG.warn("Missing .regioninfo: " + regioninfofile.toString())
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next
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end
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is = fs.open(regioninfofile)
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hri = HRegionInfo.new()
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hri.readFields(is)
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is.close()
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next unless Bytes.equals(leftEdge.getEndKey(), hri.getStartKey())
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# TODO: Check against right edge to make sure this addition does not overflow right edge.
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# TODO: Check that the schema matches both left and right edges schemas.
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p = Put.new(hri.getRegionName())
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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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LOG.info("Plugged hole in .META. at: " + hri.toString())
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plugged = true
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end
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return plugged
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end
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fixup = isFixup()
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# Get configuration
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conf = getConfiguration()
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# Filesystem
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fs = FileSystem.get(conf)
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# Rootdir
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rootdir = FSUtils.getRootDir(conf)
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# Get a logger and a metautils instance.
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LOG = LogFactory.getLog(NAME)
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# Scan the .META. looking for holes
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metatable = HTable.new(conf, HConstants::META_TABLE_NAME)
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scan = Scan.new()
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scanner = metatable.getScanner(scan)
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oldHRI = nil
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bad = nil
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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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bytes = result.getValue(HConstants::CATALOG_FAMILY, HConstants::REGIONINFO_QUALIFIER)
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hri = Writables.getHRegionInfo(bytes)
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if oldHRI
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unless Bytes.equals(oldHRI.getEndKey(), hri.getStartKey())
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LOG.warn("hole after " + hri.toString())
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if fixup
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bad = 1 unless fixup(oldHRI, hri, metatable, fs, rootdir)
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else
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bad = 1
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end
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end
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end
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oldHRI = hri
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end
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scanner.close()
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if bad
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LOG.info(".META. has holes")
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else
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LOG.info(".META. is healthy")
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end
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# Return 0 if meta is good, else non-zero.
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exit bad
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