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20 package org.apache.hadoop.hbase.util;
21
22 import java.io.IOException;
23 import java.util.Collections;
24 import java.util.Map;
25 import java.util.TreeMap;
26
27 import org.apache.commons.logging.Log;
28 import org.apache.commons.logging.LogFactory;
29 import org.apache.hadoop.hbase.classification.InterfaceAudience;
30 import org.apache.hadoop.conf.Configuration;
31 import org.apache.hadoop.fs.FileSystem;
32 import org.apache.hadoop.hbase.HBaseConfiguration;
33 import org.apache.hadoop.hbase.HConstants;
34 import org.apache.hadoop.hbase.HRegionInfo;
35 import org.apache.hadoop.hbase.TableName;
36 import org.apache.hadoop.hbase.regionserver.HRegion;
37 import org.apache.hadoop.hbase.regionserver.wal.HLog;
38 import org.apache.hadoop.hbase.regionserver.wal.HLogFactory;
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46
47 @InterfaceAudience.Private
48 public class MetaUtils {
49 private static final Log LOG = LogFactory.getLog(MetaUtils.class);
50 private final Configuration conf;
51 private final FSTableDescriptors descriptors;
52 private FileSystem fs;
53 private HLog log;
54 private HRegion metaRegion;
55 private Map<byte [], HRegion> metaRegions = Collections.synchronizedSortedMap(
56 new TreeMap<byte [], HRegion>(Bytes.BYTES_COMPARATOR));
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60
61 public MetaUtils() throws IOException {
62 this(HBaseConfiguration.create());
63 }
64
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67
68
69 public MetaUtils(Configuration conf) throws IOException {
70 this.conf = conf;
71 conf.setInt(HConstants.HBASE_CLIENT_RETRIES_NUMBER, 1);
72 this.metaRegion = null;
73 this.descriptors = new FSTableDescriptors(conf);
74 initialize();
75 }
76
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80
81 private void initialize() throws IOException {
82 this.fs = FileSystem.get(this.conf);
83 }
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88
89 public synchronized HLog getLog() throws IOException {
90 if (this.log == null) {
91 String logName =
92 HConstants.HREGION_LOGDIR_NAME + "_" + System.currentTimeMillis();
93 this.log = HLogFactory.createHLog(this.fs, this.fs.getHomeDirectory(),
94 logName, this.conf);
95 }
96 return this.log;
97 }
98
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102
103 public HRegion getMetaRegion() throws IOException {
104 if (this.metaRegion == null) {
105 openMetaRegion();
106 }
107 return this.metaRegion;
108 }
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114
115 public void shutdown() {
116 if (this.metaRegion != null) {
117 try {
118 this.metaRegion.close();
119 } catch (IOException e) {
120 LOG.error("closing meta region", e);
121 } finally {
122 this.metaRegion = null;
123 }
124 }
125 try {
126 for (HRegion r: metaRegions.values()) {
127 LOG.info("CLOSING hbase:meta " + r.toString());
128 r.close();
129 }
130 } catch (IOException e) {
131 LOG.error("closing meta region", e);
132 } finally {
133 metaRegions.clear();
134 }
135 try {
136 if (this.log != null) {
137 this.log.rollWriter();
138 this.log.closeAndDelete();
139 }
140 } catch (IOException e) {
141 LOG.error("closing HLog", e);
142 } finally {
143 this.log = null;
144 }
145 }
146
147 private synchronized HRegion openMetaRegion() throws IOException {
148 if (this.metaRegion != null) {
149 return this.metaRegion;
150 }
151 this.metaRegion = HRegion.openHRegion(HRegionInfo.FIRST_META_REGIONINFO,
152 descriptors.get(TableName.META_TABLE_NAME), getLog(), this.conf);
153 this.metaRegion.compactStores();
154 return this.metaRegion;
155 }
156 }