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19 package org.apache.hadoop.hbase.regionserver;
20
21 import java.io.IOException;
22 import java.util.Map.Entry;
23 import java.util.concurrent.ConcurrentHashMap;
24 import java.util.concurrent.atomic.AtomicBoolean;
25 import java.util.concurrent.locks.ReentrantLock;
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.hbase.HConstants;
31 import org.apache.hadoop.hbase.RemoteExceptionHandler;
32 import org.apache.hadoop.hbase.Server;
33 import org.apache.hadoop.hbase.regionserver.wal.FailedLogCloseException;
34 import org.apache.hadoop.hbase.wal.WAL;
35 import org.apache.hadoop.hbase.regionserver.wal.WALActionsListener;
36 import org.apache.hadoop.hbase.util.Bytes;
37 import org.apache.hadoop.hbase.util.HasThread;
38
39 import java.io.IOException;
40 import java.util.concurrent.atomic.AtomicBoolean;
41 import java.util.concurrent.locks.ReentrantLock;
42
43 import com.google.common.annotations.VisibleForTesting;
44
45
46
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52
53
54 @InterfaceAudience.Private
55 @VisibleForTesting
56 public class LogRoller extends HasThread {
57 static final Log LOG = LogFactory.getLog(LogRoller.class);
58 private final ReentrantLock rollLock = new ReentrantLock();
59 private final AtomicBoolean rollLog = new AtomicBoolean(false);
60 private final ConcurrentHashMap<WAL, Boolean> walNeedsRoll =
61 new ConcurrentHashMap<WAL, Boolean>();
62 private final Server server;
63 protected final RegionServerServices services;
64 private volatile long lastrolltime = System.currentTimeMillis();
65
66 private final long rollperiod;
67 private final int threadWakeFrequency;
68
69 public void addWAL(final WAL wal) {
70 if (null == walNeedsRoll.putIfAbsent(wal, Boolean.FALSE)) {
71 wal.registerWALActionsListener(new WALActionsListener.Base() {
72 @Override
73 public void logRollRequested(boolean lowReplicas) {
74 walNeedsRoll.put(wal, Boolean.TRUE);
75
76 synchronized(rollLog) {
77 rollLog.set(true);
78 rollLog.notifyAll();
79 }
80 }
81 });
82 }
83 }
84
85 public void requestRollAll() {
86 for (WAL wal : walNeedsRoll.keySet()) {
87 walNeedsRoll.put(wal, Boolean.TRUE);
88 }
89 synchronized(rollLog) {
90 rollLog.set(true);
91 rollLog.notifyAll();
92 }
93 }
94
95
96 public LogRoller(final Server server, final RegionServerServices services) {
97 super();
98 this.server = server;
99 this.services = services;
100 this.rollperiod = this.server.getConfiguration().
101 getLong("hbase.regionserver.logroll.period", 3600000);
102 this.threadWakeFrequency = this.server.getConfiguration().
103 getInt(HConstants.THREAD_WAKE_FREQUENCY, 10 * 1000);
104 }
105
106 @Override
107 public void run() {
108 while (!server.isStopped()) {
109 long now = System.currentTimeMillis();
110 boolean periodic = false;
111 if (!rollLog.get()) {
112 periodic = (now - this.lastrolltime) > this.rollperiod;
113 if (!periodic) {
114 synchronized (rollLog) {
115 try {
116 if (!rollLog.get()) rollLog.wait(this.threadWakeFrequency);
117 } catch (InterruptedException e) {
118
119 }
120 }
121 continue;
122 }
123
124 if (LOG.isDebugEnabled()) {
125 LOG.debug("Wal roll period " + this.rollperiod + "ms elapsed");
126 }
127 } else if (LOG.isDebugEnabled()) {
128 LOG.debug("WAL roll requested");
129 }
130 rollLock.lock();
131 try {
132 this.lastrolltime = now;
133 for (Entry<WAL, Boolean> entry : walNeedsRoll.entrySet()) {
134 final WAL wal = entry.getKey();
135
136
137 final byte [][] regionsToFlush = wal.rollWriter(periodic ||
138 entry.getValue().booleanValue());
139 walNeedsRoll.put(wal, Boolean.FALSE);
140 if (regionsToFlush != null) {
141 for (byte [] r: regionsToFlush) scheduleFlush(r);
142 }
143 }
144 } catch (FailedLogCloseException e) {
145 server.abort("Failed log close in log roller", e);
146 } catch (java.net.ConnectException e) {
147 server.abort("Failed log close in log roller", e);
148 } catch (IOException ex) {
149
150 server.abort("IOE in log roller",
151 RemoteExceptionHandler.checkIOException(ex));
152 } catch (Exception ex) {
153 LOG.error("Log rolling failed", ex);
154 server.abort("Log rolling failed", ex);
155 } finally {
156 try {
157 rollLog.set(false);
158 } finally {
159 rollLock.unlock();
160 }
161 }
162 }
163 LOG.info("LogRoller exiting.");
164 }
165
166
167
168
169 private void scheduleFlush(final byte [] encodedRegionName) {
170 boolean scheduled = false;
171 HRegion r = this.services.getFromOnlineRegions(Bytes.toString(encodedRegionName));
172 FlushRequester requester = null;
173 if (r != null) {
174 requester = this.services.getFlushRequester();
175 if (requester != null) {
176 requester.requestFlush(r);
177 scheduled = true;
178 }
179 }
180 if (!scheduled) {
181 LOG.warn("Failed to schedule flush of " +
182 Bytes.toString(encodedRegionName) + ", region=" + r + ", requester=" +
183 requester);
184 }
185 }
186
187 }