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Posted to commits@hbase.apache.org by gi...@apache.org on 2018/05/16 18:49:49 UTC
[08/21] hbase-site git commit: Published site at
2c32272dfa40dbf574343901c2ddea9319ca0bd5.
http://git-wip-us.apache.org/repos/asf/hbase-site/blob/ec5d5242/devapidocs/src-html/org/apache/hadoop/hbase/regionserver/wal/AbstractFSWAL.WalProps.html
----------------------------------------------------------------------
diff --git a/devapidocs/src-html/org/apache/hadoop/hbase/regionserver/wal/AbstractFSWAL.WalProps.html b/devapidocs/src-html/org/apache/hadoop/hbase/regionserver/wal/AbstractFSWAL.WalProps.html
index 269c311..8c0f827 100644
--- a/devapidocs/src-html/org/apache/hadoop/hbase/regionserver/wal/AbstractFSWAL.WalProps.html
+++ b/devapidocs/src-html/org/apache/hadoop/hbase/regionserver/wal/AbstractFSWAL.WalProps.html
@@ -186,959 +186,963 @@
<span class="sourceLineNo">178</span> // If > than this size, roll the log.<a name="line.178"></a>
<span class="sourceLineNo">179</span> protected final long logrollsize;<a name="line.179"></a>
<span class="sourceLineNo">180</span><a name="line.180"></a>
-<span class="sourceLineNo">181</span> /*<a name="line.181"></a>
-<span class="sourceLineNo">182</span> * If more than this many logs, force flush of oldest region to oldest edit goes to disk. If too<a name="line.182"></a>
-<span class="sourceLineNo">183</span> * many and we crash, then will take forever replaying. Keep the number of logs tidy.<a name="line.183"></a>
-<span class="sourceLineNo">184</span> */<a name="line.184"></a>
-<span class="sourceLineNo">185</span> protected final int maxLogs;<a name="line.185"></a>
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-<span class="sourceLineNo">187</span> /**<a name="line.187"></a>
-<span class="sourceLineNo">188</span> * This lock makes sure only one log roll runs at a time. Should not be taken while any other lock<a name="line.188"></a>
-<span class="sourceLineNo">189</span> * is held. We don't just use synchronized because that results in bogus and tedious findbugs<a name="line.189"></a>
-<span class="sourceLineNo">190</span> * warning when it thinks synchronized controls writer thread safety. It is held when we are<a name="line.190"></a>
-<span class="sourceLineNo">191</span> * actually rolling the log. It is checked when we are looking to see if we should roll the log or<a name="line.191"></a>
-<span class="sourceLineNo">192</span> * not.<a name="line.192"></a>
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-<span class="sourceLineNo">194</span> protected final ReentrantLock rollWriterLock = new ReentrantLock(true);<a name="line.194"></a>
-<span class="sourceLineNo">195</span><a name="line.195"></a>
-<span class="sourceLineNo">196</span> // The timestamp (in ms) when the log file was created.<a name="line.196"></a>
-<span class="sourceLineNo">197</span> protected final AtomicLong filenum = new AtomicLong(-1);<a name="line.197"></a>
-<span class="sourceLineNo">198</span><a name="line.198"></a>
-<span class="sourceLineNo">199</span> // Number of transactions in the current Wal.<a name="line.199"></a>
-<span class="sourceLineNo">200</span> protected final AtomicInteger numEntries = new AtomicInteger(0);<a name="line.200"></a>
-<span class="sourceLineNo">201</span><a name="line.201"></a>
-<span class="sourceLineNo">202</span> /**<a name="line.202"></a>
-<span class="sourceLineNo">203</span> * The highest known outstanding unsync'd WALEdit transaction id. Usually, we use a queue to pass<a name="line.203"></a>
-<span class="sourceLineNo">204</span> * WALEdit to background consumer thread, and the transaction id is the sequence number of the<a name="line.204"></a>
-<span class="sourceLineNo">205</span> * corresponding entry in queue.<a name="line.205"></a>
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-<span class="sourceLineNo">207</span> protected volatile long highestUnsyncedTxid = -1;<a name="line.207"></a>
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-<span class="sourceLineNo">209</span> /**<a name="line.209"></a>
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-<span class="sourceLineNo">211</span> * {@link #highestUnsyncedTxid} for case where we have an append where a sync has not yet come in<a name="line.211"></a>
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-<span class="sourceLineNo">216</span> /**<a name="line.216"></a>
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+<span class="sourceLineNo">181</span> /**<a name="line.181"></a>
+<span class="sourceLineNo">182</span> * Block size to use writing files.<a name="line.182"></a>
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+<span class="sourceLineNo">184</span> protected final long blocksize;<a name="line.184"></a>
+<span class="sourceLineNo">185</span><a name="line.185"></a>
+<span class="sourceLineNo">186</span> /*<a name="line.186"></a>
+<span class="sourceLineNo">187</span> * If more than this many logs, force flush of oldest region to oldest edit goes to disk. If too<a name="line.187"></a>
+<span class="sourceLineNo">188</span> * many and we crash, then will take forever replaying. Keep the number of logs tidy.<a name="line.188"></a>
+<span class="sourceLineNo">189</span> */<a name="line.189"></a>
+<span class="sourceLineNo">190</span> protected final int maxLogs;<a name="line.190"></a>
+<span class="sourceLineNo">191</span><a name="line.191"></a>
+<span class="sourceLineNo">192</span> /**<a name="line.192"></a>
+<span class="sourceLineNo">193</span> * This lock makes sure only one log roll runs at a time. Should not be taken while any other lock<a name="line.193"></a>
+<span class="sourceLineNo">194</span> * is held. We don't just use synchronized because that results in bogus and tedious findbugs<a name="line.194"></a>
+<span class="sourceLineNo">195</span> * warning when it thinks synchronized controls writer thread safety. It is held when we are<a name="line.195"></a>
+<span class="sourceLineNo">196</span> * actually rolling the log. It is checked when we are looking to see if we should roll the log or<a name="line.196"></a>
+<span class="sourceLineNo">197</span> * not.<a name="line.197"></a>
+<span class="sourceLineNo">198</span> */<a name="line.198"></a>
+<span class="sourceLineNo">199</span> protected final ReentrantLock rollWriterLock = new ReentrantLock(true);<a name="line.199"></a>
+<span class="sourceLineNo">200</span><a name="line.200"></a>
+<span class="sourceLineNo">201</span> // The timestamp (in ms) when the log file was created.<a name="line.201"></a>
+<span class="sourceLineNo">202</span> protected final AtomicLong filenum = new AtomicLong(-1);<a name="line.202"></a>
+<span class="sourceLineNo">203</span><a name="line.203"></a>
+<span class="sourceLineNo">204</span> // Number of transactions in the current Wal.<a name="line.204"></a>
+<span class="sourceLineNo">205</span> protected final AtomicInteger numEntries = new AtomicInteger(0);<a name="line.205"></a>
+<span class="sourceLineNo">206</span><a name="line.206"></a>
+<span class="sourceLineNo">207</span> /**<a name="line.207"></a>
+<span class="sourceLineNo">208</span> * The highest known outstanding unsync'd WALEdit transaction id. Usually, we use a queue to pass<a name="line.208"></a>
+<span class="sourceLineNo">209</span> * WALEdit to background consumer thread, and the transaction id is the sequence number of the<a name="line.209"></a>
+<span class="sourceLineNo">210</span> * corresponding entry in queue.<a name="line.210"></a>
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+<span class="sourceLineNo">212</span> protected volatile long highestUnsyncedTxid = -1;<a name="line.212"></a>
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+<span class="sourceLineNo">214</span> /**<a name="line.214"></a>
+<span class="sourceLineNo">215</span> * Updated to the transaction id of the last successful sync call. This can be less than<a name="line.215"></a>
+<span class="sourceLineNo">216</span> * {@link #highestUnsyncedTxid} for case where we have an append where a sync has not yet come in<a name="line.216"></a>
+<span class="sourceLineNo">217</span> * for it.<a name="line.217"></a>
<span class="sourceLineNo">218</span> */<a name="line.218"></a>
-<span class="sourceLineNo">219</span> protected final AtomicLong totalLogSize = new AtomicLong(0);<a name="line.219"></a>
-<span class="sourceLineNo">220</span> /**<a name="line.220"></a>
-<span class="sourceLineNo">221</span> * Current log file.<a name="line.221"></a>
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-<span class="sourceLineNo">223</span> volatile W writer;<a name="line.223"></a>
-<span class="sourceLineNo">224</span><a name="line.224"></a>
-<span class="sourceLineNo">225</span> // Last time to check low replication on hlog's pipeline<a name="line.225"></a>
-<span class="sourceLineNo">226</span> private long lastTimeCheckLowReplication = EnvironmentEdgeManager.currentTime();<a name="line.226"></a>
-<span class="sourceLineNo">227</span><a name="line.227"></a>
-<span class="sourceLineNo">228</span> protected volatile boolean closed = false;<a name="line.228"></a>
+<span class="sourceLineNo">219</span> protected final AtomicLong highestSyncedTxid = new AtomicLong(0);<a name="line.219"></a>
+<span class="sourceLineNo">220</span><a name="line.220"></a>
+<span class="sourceLineNo">221</span> /**<a name="line.221"></a>
+<span class="sourceLineNo">222</span> * The total size of wal<a name="line.222"></a>
+<span class="sourceLineNo">223</span> */<a name="line.223"></a>
+<span class="sourceLineNo">224</span> protected final AtomicLong totalLogSize = new AtomicLong(0);<a name="line.224"></a>
+<span class="sourceLineNo">225</span> /**<a name="line.225"></a>
+<span class="sourceLineNo">226</span> * Current log file.<a name="line.226"></a>
+<span class="sourceLineNo">227</span> */<a name="line.227"></a>
+<span class="sourceLineNo">228</span> volatile W writer;<a name="line.228"></a>
<span class="sourceLineNo">229</span><a name="line.229"></a>
-<span class="sourceLineNo">230</span> protected final AtomicBoolean shutdown = new AtomicBoolean(false);<a name="line.230"></a>
-<span class="sourceLineNo">231</span> /**<a name="line.231"></a>
-<span class="sourceLineNo">232</span> * WAL Comparator; it compares the timestamp (log filenum), present in the log file name. Throws<a name="line.232"></a>
-<span class="sourceLineNo">233</span> * an IllegalArgumentException if used to compare paths from different wals.<a name="line.233"></a>
-<span class="sourceLineNo">234</span> */<a name="line.234"></a>
-<span class="sourceLineNo">235</span> final Comparator<Path> LOG_NAME_COMPARATOR =<a name="line.235"></a>
-<span class="sourceLineNo">236</span> (o1, o2) -> Long.compare(getFileNumFromFileName(o1), getFileNumFromFileName(o2));<a name="line.236"></a>
-<span class="sourceLineNo">237</span><a name="line.237"></a>
-<span class="sourceLineNo">238</span> private static final class WalProps {<a name="line.238"></a>
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-<span class="sourceLineNo">240</span> /**<a name="line.240"></a>
-<span class="sourceLineNo">241</span> * Map the encoded region name to the highest sequence id. Contain all the regions it has<a name="line.241"></a>
-<span class="sourceLineNo">242</span> * entries of<a name="line.242"></a>
-<span class="sourceLineNo">243</span> */<a name="line.243"></a>
-<span class="sourceLineNo">244</span> public final Map<byte[], Long> encodedName2HighestSequenceId;<a name="line.244"></a>
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-<span class="sourceLineNo">246</span> /**<a name="line.246"></a>
-<span class="sourceLineNo">247</span> * The log file size. Notice that the size may not be accurate if we do asynchronous close in<a name="line.247"></a>
-<span class="sourceLineNo">248</span> * sub classes.<a name="line.248"></a>
-<span class="sourceLineNo">249</span> */<a name="line.249"></a>
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-<span class="sourceLineNo">252</span> public WalProps(Map<byte[], Long> encodedName2HighestSequenceId, long logSize) {<a name="line.252"></a>
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-<span class="sourceLineNo">254</span> this.logSize = logSize;<a name="line.254"></a>
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-<span class="sourceLineNo">258</span> /**<a name="line.258"></a>
-<span class="sourceLineNo">259</span> * Map of WAL log file to properties. The map is sorted by the log file creation timestamp<a name="line.259"></a>
-<span class="sourceLineNo">260</span> * (contained in the log file name).<a name="line.260"></a>
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-<span class="sourceLineNo">265</span> /**<a name="line.265"></a>
-<span class="sourceLineNo">266</span> * Map of {@link SyncFuture}s keyed by Handler objects. Used so we reuse SyncFutures.<a name="line.266"></a>
-<span class="sourceLineNo">267</span> * <p><a name="line.267"></a>
-<span class="sourceLineNo">268</span> * TODO: Reuse FSWALEntry's rather than create them anew each time as we do SyncFutures here.<a name="line.268"></a>
-<span class="sourceLineNo">269</span> * <p><a name="line.269"></a>
-<span class="sourceLineNo">270</span> * TODO: Add a FSWalEntry and SyncFuture as thread locals on handlers rather than have them get<a name="line.270"></a>
-<span class="sourceLineNo">271</span> * them from this Map?<a name="line.271"></a>
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-<span class="sourceLineNo">276</span> * The class name of the runtime implementation, used as prefix for logging/tracing.<a name="line.276"></a>
-<span class="sourceLineNo">277</span> * <p><a name="line.277"></a>
-<span class="sourceLineNo">278</span> * Performance testing shows getClass().getSimpleName() might be a bottleneck so we store it here,<a name="line.278"></a>
-<span class="sourceLineNo">279</span> * refer to HBASE-17676 for more details<a name="line.279"></a>
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-<span class="sourceLineNo">283</span><a name="line.283"></a>
-<span class="sourceLineNo">284</span> public long getFilenum() {<a name="line.284"></a>
-<span class="sourceLineNo">285</span> return this.filenum.get();<a name="line.285"></a>
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-<span class="sourceLineNo">287</span><a name="line.287"></a>
-<span class="sourceLineNo">288</span> /**<a name="line.288"></a>
-<span class="sourceLineNo">289</span> * A log file has a creation timestamp (in ms) in its file name ({@link #filenum}. This helper<a name="line.289"></a>
-<span class="sourceLineNo">290</span> * method returns the creation timestamp from a given log file. It extracts the timestamp assuming<a name="line.290"></a>
-<span class="sourceLineNo">291</span> * the filename is created with the {@link #computeFilename(long filenum)} method.<a name="line.291"></a>
-<span class="sourceLineNo">292</span> * @return timestamp, as in the log file name.<a name="line.292"></a>
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-<span class="sourceLineNo">294</span> protected long getFileNumFromFileName(Path fileName) {<a name="line.294"></a>
-<span class="sourceLineNo">295</span> checkNotNull(fileName, "file name can't be null");<a name="line.295"></a>
-<span class="sourceLineNo">296</span> if (!ourFiles.accept(fileName)) {<a name="line.296"></a>
-<span class="sourceLineNo">297</span> throw new IllegalArgumentException(<a name="line.297"></a>
-<span class="sourceLineNo">298</span> "The log file " + fileName + " doesn't belong to this WAL. (" + toString() + ")");<a name="line.298"></a>
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-<span class="sourceLineNo">302</span> (fileNameString.length() - walFileSuffix.length()));<a name="line.302"></a>
-<span class="sourceLineNo">303</span> return Long.parseLong(chompedPath);<a name="line.303"></a>
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-<span class="sourceLineNo">308</span> return (int) ((globalMemstoreSize.getFirst() * 2) / logRollSize);<a name="line.308"></a>
+<span class="sourceLineNo">230</span> // Last time to check low replication on hlog's pipeline<a name="line.230"></a>
+<span class="sourceLineNo">231</span> private long lastTimeCheckLowReplication = EnvironmentEdgeManager.currentTime();<a name="line.231"></a>
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+<span class="sourceLineNo">236</span> /**<a name="line.236"></a>
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+<span class="sourceLineNo">239</span> */<a name="line.239"></a>
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+<span class="sourceLineNo">245</span> /**<a name="line.245"></a>
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+<span class="sourceLineNo">248</span> */<a name="line.248"></a>
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+<span class="sourceLineNo">251</span> /**<a name="line.251"></a>
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+<span class="sourceLineNo">257</span> public WalProps(Map<byte[], Long> encodedName2HighestSequenceId, long logSize) {<a name="line.257"></a>
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+<span class="sourceLineNo">263</span> /**<a name="line.263"></a>
+<span class="sourceLineNo">264</span> * Map of WAL log file to properties. The map is sorted by the log file creation timestamp<a name="line.264"></a>
+<span class="sourceLineNo">265</span> * (contained in the log file name).<a name="line.265"></a>
+<span class="sourceLineNo">266</span> */<a name="line.266"></a>
+<span class="sourceLineNo">267</span> protected ConcurrentNavigableMap<Path, WalProps> walFile2Props =<a name="line.267"></a>
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+<span class="sourceLineNo">273</span> * TODO: Reuse FSWALEntry's rather than create them anew each time as we do SyncFutures here.<a name="line.273"></a>
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+<span class="sourceLineNo">284</span> * refer to HBASE-17676 for more details<a name="line.284"></a>
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+<span class="sourceLineNo">288</span><a name="line.288"></a>
+<span class="sourceLineNo">289</span> public long getFilenum() {<a name="line.289"></a>
+<span class="sourceLineNo">290</span> return this.filenum.get();<a name="line.290"></a>
+<span class="sourceLineNo">291</span> }<a name="line.291"></a>
+<span class="sourceLineNo">292</span><a name="line.292"></a>
+<span class="sourceLineNo">293</span> /**<a name="line.293"></a>
+<span class="sourceLineNo">294</span> * A log file has a creation timestamp (in ms) in its file name ({@link #filenum}. This helper<a name="line.294"></a>
+<span class="sourceLineNo">295</span> * method returns the creation timestamp from a given log file. It extracts the timestamp assuming<a name="line.295"></a>
+<span class="sourceLineNo">296</span> * the filename is created with the {@link #computeFilename(long filenum)} method.<a name="line.296"></a>
+<span class="sourceLineNo">297</span> * @return timestamp, as in the log file name.<a name="line.297"></a>
+<span class="sourceLineNo">298</span> */<a name="line.298"></a>
+<span class="sourceLineNo">299</span> protected long getFileNumFromFileName(Path fileName) {<a name="line.299"></a>
+<span class="sourceLineNo">300</span> checkNotNull(fileName, "file name can't be null");<a name="line.300"></a>
+<span class="sourceLineNo">301</span> if (!ourFiles.accept(fileName)) {<a name="line.301"></a>
+<span class="sourceLineNo">302</span> throw new IllegalArgumentException(<a name="line.302"></a>
+<span class="sourceLineNo">303</span> "The log file " + fileName + " doesn't belong to this WAL. (" + toString() + ")");<a name="line.303"></a>
+<span class="sourceLineNo">304</span> }<a name="line.304"></a>
+<span class="sourceLineNo">305</span> final String fileNameString = fileName.toString();<a name="line.305"></a>
+<span class="sourceLineNo">306</span> String chompedPath = fileNameString.substring(prefixPathStr.length(),<a name="line.306"></a>
+<span class="sourceLineNo">307</span> (fileNameString.length() - walFileSuffix.length()));<a name="line.307"></a>
+<span class="sourceLineNo">308</span> return Long.parseLong(chompedPath);<a name="line.308"></a>
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-<span class="sourceLineNo">314</span> // be stuck and make no progress if the buffer is filled with appends only and there is no<a name="line.314"></a>
-<span class="sourceLineNo">315</span> // sync. If no sync, then the handlers will be outstanding just waiting on sync completion<a name="line.315"></a>
-<span class="sourceLineNo">316</span> // before they return.<a name="line.316"></a>
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-<span class="sourceLineNo">319</span> checkArgument(preallocatedEventCount >= 0,<a name="line.319"></a>
-<span class="sourceLineNo">320</span> "hbase.regionserver.wal.disruptor.event.count must > 0");<a name="line.320"></a>
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-<span class="sourceLineNo">394</span> for (WALActionsListener i : listeners) {<a name="line.394"></a>
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-<span class="sourceLineNo">406</span> // 2 times the DFS default: i.e. 2 * DFS default block size rolling at 50% full will generally<a name="line.406"></a>
-<span class="sourceLineNo">407</span> // make similar size logs to 1 * DFS default block size rolling at 95% full. See HBASE-19148.<a name="line.407"></a>
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-<span class="sourceLineNo">419</span><a name="line.419"></a>
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-<span class="sourceLineNo">424</span> .toNanos(conf.getInt("hbase.regionserver.hlog.slowsync.ms", DEFAULT_SLOW_SYNC_TIME_MS));<a name="line.424"></a>
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-<span class="sourceLineNo">426</span> .toNanos(conf.getLong("hbase.regionserver.hlog.sync.timeout", DEFAULT_WAL_SYNC_TIMEOUT_MS));<a name="line.426"></a>
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-<span class="sourceLineNo">521</span> this.filenum.incrementAndGet();<a name="line.521"></a>
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-<span class="sourceLineNo">526</span><a name="line.526"></a>
-<span class="sourceLineNo">527</span> @VisibleForTesting<a name="line.527"></a>
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-<span class="sourceLineNo">530</span> Path oldPath = null;<a name="line.530"></a>
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-<span class="sourceLineNo">534</span> } // I presume if currentFilenum is <= 0, this is first file and null for oldPath if fine?<a name="line.534"></a>
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-<span class="sourceLineNo">537</span><a name="line.537"></a>
-<span class="sourceLineNo">538</span> /**<a name="line.538"></a>
-<span class="sourceLineNo">539</span> * Tell listeners about pre log roll.<a name="line.539"></a>
-<span class="sourceLineNo">540</span> */<a name="line.540"></a>
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-<span class="sourceLineNo">543</span> coprocessorHost.preWALRoll(oldPath, newPath);<a name="line.543"></a>
-<span class="sourceLineNo">544</span><a name="line.544"></a>
-<span class="sourceLineNo">545</span> if (!this.listeners.isEmpty()) {<a name="line.545"></a>
-<span class="sourceLineNo">546</span> for (WALActionsListener i : this.listeners) {<a name="line.546"></a>
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-<span class="sourceLineNo">548</span> }<a name="line.548"></a>
-<span class="sourceLineNo">549</span> }<a name="line.549"></a>
-<span class="sourceLineNo">550</span> }<a name="line.550"></a>
-<span class="sourceLineNo">551</span><a name="line.551"></a>
-<span class="sourceLineNo">552</span> /**<a name="line.552"></a>
-<span class="sourceLineNo">553</span> * Tell listeners about post log roll.<a name="line.553"></a>
-<span class="sourceLineNo">554</span> */<a name="line.554"></a>
-<span class="sourceLineNo">555</span> private void tellListenersAboutPostLogRoll(final Path oldPath, final Path newPath)<a name="line.555"></a>
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-<span class="sourceLineNo">557</span> if (!this.listeners.isEmpty()) {<a name="line.557"></a>
-<span class="sourceLineNo">558</span> for (WALActionsListener i : this.listeners) {<a name="line.558"></a>
-<span class="sourceLineNo">559</span> i.postLogRoll(oldPath, newPath);<a name="line.559"></a>
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-<span class="sourceLineNo">561</span> }<a name="line.561"></a>
-<span class="sourceLineNo">562</span><a name="line.562"></a>
-<span class="sourceLineNo">563</span> coprocessorHost.postWALRoll(oldPath, newPath);<a name="line.563"></a>
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-<span class="sourceLineNo">572</span> // public only until class moves to o.a.h.h.wal<a name="line.572"></a>
-<span class="sourceLineNo">573</span> /** @return the number of log files in use */<a name="line.573"></a>
-<span class="sourceLineNo">574</span> public int getNumLogFiles() {<a name="line.574"></a>
-<span class="sourceLineNo">575</span> // +1 for current use log<a name="line.575"></a>
-<span class="sourceLineNo">576</span> return getNumRolledLogFiles() + 1;<a name="line.576"></a>
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-<span class="sourceLineNo">578</span><a name="line.578"></a>
-<span class="sourceLineNo">579</span> /**<a name="line.579"></a>
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-<span class="sourceLineNo">581</span> * (oldest) WAL file, and returns those regions which should be flushed so that it can be<a name="line.581"></a>
-<span class="sourceLineNo">582</span> * archived.<a name="line.582"></a>
-<span class="sourceLineNo">583</span> * @return regions (encodedRegionNames) to flush in order to archive oldest WAL file.<a name="line.583"></a>
-<span class="sourceLineNo">584</span> */<a name="line.584"></a>
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-<span class="sourceLineNo">590</span> regions =<a name="line.590"></a>
-<span class="sourceLineNo">591</span> this.sequenceIdAccounting.findLower(firstWALEntry.getValue().encodedName2HighestSequenceId);<a name="line.591"></a>
-<span class="sourceLineNo">592</span> }<a name="line.592"></a>
-<span class="sourceLineNo">593</span> if (regions != null) {<a name="line.593"></a>
-<span class="sourceLineNo">594</span> StringBuilder sb = new StringBuilder();<a name="line.594"></a>
-<span class="sourceLineNo">595</span> for (int i = 0; i < regions.length; i++) {<a name="line.595"></a>
-<span class="sourceLineNo">596</span> if (i > 0) {<a name="line.596"></a>
-<span class="sourceLineNo">597</span> sb.append(", ");<a name="line.597"></a>
-<span class="sourceLineNo">598</span> }<a name="line.598"></a>
-<span class="sourceLineNo">599</span> sb.append(Bytes.toStringBinary(regions[i]));<a name="line.599"></a>
-<span class="sourceLineNo">600</span> }<a name="line.600"></a>
-<span class="sourceLineNo">601</span> LOG.info("Too many WALs; count=" + logCount + ", max=" + this.maxLogs +<a name="line.601"></a>
-<span class="sourceLineNo">602</span> "; forcing flush of " + regions.length + " regions(s): " + sb.toString());<a name="line.602"></a>
-<span class="sourceLineNo">603</span> }<a name="line.603"></a>
-<span class="sourceLineNo">604</span> return regions;<a name="line.604"></a>
-<span class="sourceLineNo">605</span> }<a name="line.605"></a>
-<span class="sourceLineNo">606</span><a name="line.606"></a>
-<span class="sourceLineNo">607</span> /**<a name="line.607"></a>
-<span class="sourceLineNo">608</span> * Archive old logs. A WAL is eligible for archiving if all its WALEdits have been flushed.<a name="line.608"></a>
-<span class="sourceLineNo">609</span> */<a name="line.609"></a>
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-<span class="sourceLineNo">613</span> // are older than what is currently in memory, the WAL can be GC'd.<a name="line.613"></a>
-<span class="sourceLineNo">614</span> for (Map.Entry<Path, WalProps> e : this.walFile2Props.entrySet()) {<a name="line.614"></a>
-<span class="sourceLineNo">615</span> Path log = e.getKey();<a name="line.615"></a>
-<span class="sourceLineNo">616</span> Map<byte[], Long> sequenceNums = e.getValue().encodedName2HighestSequenceId;<a name="line.616"></a>
-<span class="sourceLineNo">617</span> if (this.sequenceIdAccounting.areAllLower(sequenceNums)) {<a name="line.617"></a>
-<span class="sourceLineNo">618</span> if (logsToArchive == null) {<a name="line.618"></a>
-<span class="sourceLineNo">619</span> logsToArchive = new ArrayList<>();<a name="line.619"></a>
-<span class="sourceLineNo">620</span> }<a name="line.620"></a>
-<span class="sourceLineNo">621</span> logsToArchive.add(Pair.newPair(log, e.getValue().logSize));<a name="line.621"></a>
-<span class="sourceLineNo">622</span> if (LOG.isTraceEnabled()) {<a name="line.622"></a>
-<span class="sourceLineNo">623</span> LOG.trace("WAL file ready for archiving " + log);<a name="line.623"></a>
+<span class="sourceLineNo">311</span> private int calculateMaxLogFiles(Configuration conf, long logRollSize) {<a name="line.311"></a>
+<span class="sourceLineNo">312</span> Pair<Long, MemoryType> globalMemstoreSize = MemorySizeUtil.getGlobalMemStoreSize(conf);<a name="line.312"></a>
+<span class="sourceLineNo">313</span> return (int) ((globalMemstoreSize.getFirst() * 2) / logRollSize);<a name="line.313"></a>
+<span class="sourceLineNo">314</span> }<a name="line.314"></a>
+<span class="sourceLineNo">315</span><a name="line.315"></a>
+<span class="sourceLineNo">316</span> // must be power of 2<a name="line.316"></a>
+<span class="sourceLineNo">317</span> protected final int getPreallocatedEventCount() {<a name="line.317"></a>
+<span class="sourceLineNo">318</span> // Preallocate objects to use on the ring buffer. The way that appends and syncs work, we will<a name="line.318"></a>
+<span class="sourceLineNo">319</span> // be stuck and make no progress if the buffer is filled with appends only and there is no<a name="line.319"></a>
+<span class="sourceLineNo">320</span> // sync. If no sync, then the handlers will be outstanding just waiting on sync completion<a name="line.320"></a>
+<span class="sourceLineNo">321</span> // before they return.<a name="line.321"></a>
+<span class="sourceLineNo">322</span> int preallocatedEventCount =<a name="line.322"></a>
+<span class="sourceLineNo">323</span> this.conf.getInt("hbase.regionserver.wal.disruptor.event.count", 1024 * 16);<a name="line.323"></a>
+<span class="sourceLineNo">324</span> checkArgument(preallocatedEventCount >= 0,<a name="line.324"></a>
+<span class="sourceLineNo">325</span> "hbase.regionserver.wal.disruptor.event.count must > 0");<a name="line.325"></a>
+<span class="sourceLineNo">326</span> int floor = Integer.highestOneBit(preallocatedEventCount);<a name="line.326"></a>
+<span class="sourceLineNo">327</span> if (floor == preallocatedEventCount) {<a name="line.327"></a>
+<span class="sourceLineNo">328</span> return floor;<a name="line.328"></a>
+<span class="sourceLineNo">329</span> }<a name="line.329"></a>
+<span class="sourceLineNo">330</span> // max capacity is 1 << 30<a name="line.330"></a>
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+<span class="sourceLineNo">332</span> return 1 << 30;<a name="line.332"></a>
+<span class="sourceLineNo">333</span> }<a name="line.333"></a>
+<span class="sourceLineNo">334</span> return floor << 1;<a name="line.334"></a>
+<span class="sourceLineNo">335</span> }<a name="line.335"></a>
+<span class="sourceLineNo">336</span><a name="line.336"></a>
+<span class="sourceLineNo">337</span> protected AbstractFSWAL(final FileSystem fs, final Path rootDir, final String logDir,<a name="line.337"></a>
+<span class="sourceLineNo">338</span> final String archiveDir, final Configuration conf, final List<WALActionsListener> listeners,<a name="line.338"></a>
+<span class="sourceLineNo">339</span> final boolean failIfWALExists, final String prefix, final String suffix)<a name="line.339"></a>
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+<span class="sourceLineNo">343</span> this.walArchiveDir = new Path(rootDir, archiveDir);<a name="line.343"></a>
+<span class="sourceLineNo">344</span> this.conf = conf;<a name="line.344"></a>
+<span class="sourceLineNo">345</span><a name="line.345"></a>
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+<span class="sourceLineNo">347</span> throw new IOException("Unable to mkdir " + walDir);<a name="line.347"></a>
+<span class="sourceLineNo">348</span> }<a name="line.348"></a>
+<span class="sourceLineNo">349</span><a name="line.349"></a>
+<span class="sourceLineNo">350</span> if (!fs.exists(this.walArchiveDir)) {<a name="line.350"></a>
+<span class="sourceLineNo">351</span> if (!fs.mkdirs(this.walArchiveDir)) {<a name="line.351"></a>
+<span class="sourceLineNo">352</span> throw new IOException("Unable to mkdir " + this.walArchiveDir);<a name="line.352"></a>
+<span class="sourceLineNo">353</span> }<a name="line.353"></a>
+<span class="sourceLineNo">354</span> }<a name="line.354"></a>
+<span class="sourceLineNo">355</span><a name="line.355"></a>
+<span class="sourceLineNo">356</span> // If prefix is null||empty then just name it wal<a name="line.356"></a>
+<span class="sourceLineNo">357</span> this.walFilePrefix =<a name="line.357"></a>
+<span class="sourceLineNo">358</span> prefix == null || prefix.isEmpty() ? "wal" : URLEncoder.encode(prefix, "UTF8");<a name="line.358"></a>
+<span class="sourceLineNo">359</span> // we only correctly differentiate suffices when numeric ones start with '.'<a name="line.359"></a>
+<span class="sourceLineNo">360</span> if (suffix != null && !(suffix.isEmpty()) && !(suffix.startsWith(WAL_FILE_NAME_DELIMITER))) {<a name="line.360"></a>
+<span class="sourceLineNo">361</span> throw new IllegalArgumentException("WAL suffix must start with '" + WAL_FILE_NAME_DELIMITER +<a name="line.361"></a>
+<span class="sourceLineNo">362</span> "' but instead was '" + suffix + "'");<a name="line.362"></a>
+<span class="sourceLineNo">363</span> }<a name="line.363"></a>
+<span class="sourceLineNo">364</span> // Now that it exists, set the storage policy for the entire directory of wal files related to<a name="line.364"></a>
+<span class="sourceLineNo">365</span> // this FSHLog instance<a name="line.365"></a>
+<span class="sourceLineNo">366</span> CommonFSUtils.setStoragePolicy(fs, conf, this.walDir, HConstants.WAL_STORAGE_POLICY,<a name="line.366"></a>
+<span class="sourceLineNo">367</span> HConstants.DEFAULT_WAL_STORAGE_POLICY);<a name="line.367"></a>
+<span class="sourceLineNo">368</span> this.walFileSuffix = (suffix == null) ? "" : URLEncoder.encode(suffix, "UTF8");<a name="line.368"></a>
+<span class="sourceLineNo">369</span> this.prefixPathStr = new Path(walDir, walFilePrefix + WAL_FILE_NAME_DELIMITER).toString();<a name="line.369"></a>
+<span class="sourceLineNo">370</span><a name="line.370"></a>
+<span class="sourceLineNo">371</span> this.ourFiles = new PathFilter() {<a name="line.371"></a>
+<span class="sourceLineNo">372</span> @Override<a name="line.372"></a>
+<span class="sourceLineNo">373</span> public boolean accept(final Path fileName) {<a name="line.373"></a>
+<span class="sourceLineNo">374</span> // The path should start with dir/<prefix> and end with our suffix<a name="line.374"></a>
+<span class="sourceLineNo">375</span> final String fileNameString = fileName.toString();<a name="line.375"></a>
+<span class="sourceLineNo">376</span> if (!fileNameString.startsWith(prefixPathStr)) {<a name="line.376"></a>
+<span class="sourceLineNo">377</span> return false;<a name="line.377"></a>
+<span class="sourceLineNo">378</span> }<a name="line.378"></a>
+<span class="sourceLineNo">379</span> if (walFileSuffix.isEmpty()) {<a name="line.379"></a>
+<span class="sourceLineNo">380</span> // in the case of the null suffix, we need to ensure the filename ends with a timestamp.<a name="line.380"></a>
+<span class="sourceLineNo">381</span> return org.apache.commons.lang3.StringUtils<a name="line.381"></a>
+<span class="sourceLineNo">382</span> .isNumeric(fileNameString.substring(prefixPathStr.length()));<a name="line.382"></a>
+<span class="sourceLineNo">383</span> } else if (!fileNameString.endsWith(walFileSuffix)) {<a name="line.383"></a>
+<span class="sourceLineNo">384</span> return false;<a name="line.384"></a>
+<span class="sourceLineNo">385</span> }<a name="line.385"></a>
+<span class="sourceLineNo">386</span> return true;<a name="line.386"></a>
+<span class="sourceLineNo">387</span> }<a name="line.387"></a>
+<span class="sourceLineNo">388</span> };<a name="line.388"></a>
+<span class="sourceLineNo">389</span><a name="line.389"></a>
+<span class="sourceLineNo">390</span> if (failIfWALExists) {<a name="line.390"></a>
+<span class="sourceLineNo">391</span> final FileStatus[] walFiles = CommonFSUtils.listStatus(fs, walDir, ourFiles);<a name="line.391"></a>
+<span class="sourceLineNo">392</span> if (null != walFiles && 0 != walFiles.length) {<a name="line.392"></a>
+<span class="sourceLineNo">393</span> throw new IOException("Target WAL already exists within directory " + walDir);<a name="line.393"></a>
+<span class="sourceLineNo">394</span> }<a name="line.394"></a>
+<span class="sourceLineNo">395</span> }<a name="line.395"></a>
+<span class="sourceLineNo">396</span><a name="line.396"></a>
+<span class="sourceLineNo">397</span> // Register listeners. TODO: Should this exist anymore? We have CPs?<a name="line.397"></a>
+<span class="sourceLineNo">398</span> if (listeners != null) {<a name="line.398"></a>
+<span class="sourceLineNo">399</span> for (WALActionsListener i : listeners) {<a name="line.399"></a>
+<span class="sourceLineNo">400</span> registerWALActionsListener(i);<a name="line.400"></a>
+<span class="sourceLineNo">401</span> }<a name="line.401"></a>
+<span class="sourceLineNo">402</span> }<a name="line.402"></a>
+<span class="sourceLineNo">403</span> this.coprocessorHost = new WALCoprocessorHost(this, conf);<a name="line.403"></a>
+<span class="sourceLineNo">404</span><a name="line.404"></a>
+<span class="sourceLineNo">405</span> // Schedule a WAL roll when the WAL is 50% of the HDFS block size. Scheduling at 50% of block<a name="line.405"></a>
+<span class="sourceLineNo">406</span> // size should make it so WAL rolls before we get to the end-of-block (Block transitions cost<a name="line.406"></a>
+<span class="sourceLineNo">407</span> // some latency). In hbase-1 we did this differently. We scheduled a roll when we hit 95% of<a name="line.407"></a>
+<span class="sourceLineNo">408</span> // the block size but experience from the field has it that this was not enough time for the<a name="line.408"></a>
+<span class="sourceLineNo">409</span> // roll to happen before end-of-block. So the new accounting makes WALs of about the same<a name="line.409"></a>
+<span class="sourceLineNo">410</span> // size as those made in hbase-1 (to prevent surprise), we now have default block size as<a name="line.410"></a>
+<span class="sourceLineNo">411</span> // 2 times the DFS default: i.e. 2 * DFS default block size rolling at 50% full will generally<a name="line.411"></a>
+<span class="sourceLineNo">412</span> // make similar size logs to 1 * DFS default block size rolling at 95% full. See HBASE-19148.<a name="line.412"></a>
+<span class="sourceLineNo">413</span> this.blocksize = WALUtil.getWALBlockSize(this.conf, this.fs, this.walDir);<a name="line.413"></a>
+<span class="sourceLineNo">414</span> float multiplier = conf.getFloat("hbase.regionserver.logroll.multiplier", 0.5f);<a name="line.414"></a>
+<span class="sourceLineNo">415</span> this.logrollsize = (long)(this.blocksize * multiplier);<a name="line.415"></a>
+<span class="sourceLineNo">416</span><a name="line.416"></a>
+<span class="sourceLineNo">417</span> boolean maxLogsDefined = conf.get("hbase.regionserver.maxlogs") != null;<a name="line.417"></a>
+<span class="sourceLineNo">418</span> if (maxLogsDefined) {<a name="line.418"></a>
+<span class="sourceLineNo">419</span> LOG.warn("'hbase.regionserver.maxlogs' was deprecated.");<a name="line.419"></a>
+<span class="sourceLineNo">420</span> }<a name="line.420"></a>
+<span class="sourceLineNo">421</span> this.maxLogs = conf.getInt("hbase.regionserver.maxlogs",<a name="line.421"></a>
+<span class="sourceLineNo">422</span> Math.max(32, calculateMaxLogFiles(conf, logrollsize)));<a name="line.422"></a>
+<span class="sourceLineNo">423</span><a name="line.423"></a>
+<span class="sourceLineNo">424</span> LOG.info("WAL configuration: blocksize=" + StringUtils.byteDesc(blocksize) + ", rollsize=" +<a name="line.424"></a>
+<span class="sourceLineNo">425</span> StringUtils.byteDesc(this.logrollsize) + ", prefix=" + this.walFilePrefix + ", suffix=" +<a name="line.425"></a>
+<span class="sourceLineNo">426</span> walFileSuffix + ", logDir=" + this.walDir + ", archiveDir=" + this.walArchiveDir);<a name="line.426"></a>
+<span class="sourceLineNo">427</span> this.slowSyncNs = TimeUnit.MILLISECONDS<a name="line.427"></a>
+<span class="sourceLineNo">428</span> .toNanos(conf.getInt("hbase.regionserver.hlog.slowsync.ms", DEFAULT_SLOW_SYNC_TIME_MS));<a name="line.428"></a>
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+<span class="sourceLineNo">430</span> .toNanos(conf.getLong("hbase.regionserver.hlog.sync.timeout", DEFAULT_WAL_SYNC_TIMEOUT_MS));<a name="line.430"></a>
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+<span class="sourceLineNo">446</span><a name="line.446"></a>
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+<span class="sourceLineNo">451</span><a name="line.451"></a>
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+<span class="sourceLineNo">456</span><a name="line.456"></a>
+<span class="sourceLineNo">457</span> @Override<a name="line.457"></a>
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+<span class="sourceLineNo">461</span><a name="line.461"></a>
+<span class="sourceLineNo">462</span> @Override<a name="line.462"></a>
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+<span class="sourceLineNo">471</span><a name="line.471"></a>
+<span class="sourceLineNo">472</span> @Override<a name="line.472"></a>
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+<span class="sourceLineNo">474</span> // Used by tests. Deprecated as too subtle for general usage.<a name="line.474"></a>
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+<span class="sourceLineNo">477</span><a name="line.477"></a>
+<span class="sourceLineNo">478</span> @Override<a name="line.478"></a>
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+<span class="sourceLineNo">489</span> }<a name="line.489"></a>
+<span class="sourceLineNo">490</span><a name="line.490"></a>
+<span class="sourceLineNo">491</span> @Override<a name="line.491"></a>
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+<span class="sourceLineNo">495</span><a name="line.495"></a>
+<span class="sourceLineNo">496</span> /**<a name="line.496"></a>
+<span class="sourceLineNo">497</span> * This is a convenience method that computes a new filename with a given file-number.<a name="line.497"></a>
+<span class="sourceLineNo">498</span> * @param filenum to use<a name="line.498"></a>
+<span class="sourceLineNo">499</span> * @return Path<a name="line.499"></a>
+<span class="sourceLineNo">500</span> */<a name="line.500"></a>
+<span class="sourceLineNo">501</span> protected Path computeFilename(final long filenum) {<a name="line.501"></a>
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+<span class="sourceLineNo">503</span> throw new RuntimeException("WAL file number can't be < 0");<a name="line.503"></a>
+<span class="sourceLineNo">504</span> }<a name="line.504"></a>
+<span class="sourceLineNo">505</span> String child = walFilePrefix + WAL_FILE_NAME_DELIMITER + filenum + walFileSuffix;<a name="line.505"></a>
+<span class="sourceLineNo">506</span> return new Path(walDir, child);<a name="line.506"></a>
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+<span class="sourceLineNo">508</span><a name="line.508"></a>
+<span class="sourceLineNo">509</span> /**<a name="line.509"></a>
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+<span class="sourceLineNo">511</span> * file-number<a name="line.511"></a>
+<span class="sourceLineNo">512</span> * @return Path<a name="line.512"></a>
+<span class="sourceLineNo">513</span> */<a name="line.513"></a>
+<span class="sourceLineNo">514</span> public Path getCurrentFileName() {<a name="line.514"></a>
+<span class="sourceLineNo">515</span> return computeFilename(this.filenum.get());<a name="line.515"></a>
+<span class="sourceLineNo">516</span> }<a name="line.516"></a>
+<span class="sourceLineNo">517</span><a name="line.517"></a>
+<span class="sourceLineNo">518</span> /**<a name="line.518"></a>
+<span class="sourceLineNo">519</span> * retrieve the next path to use for writing. Increments the internal filenum.<a name="line.519"></a>
+<span class="sourceLineNo">520</span> */<a name="line.520"></a>
+<span class="sourceLineNo">521</span> private Path getNewPath() throws IOException {<a name="line.521"></a>
+<span class="sourceLineNo">522</span> this.filenum.set(System.currentTimeMillis());<a name="line.522"></a>
+<span class="sourceLineNo">523</span> Path newPath = getCurrentFileName();<a name="line.523"></a>
+<span class="sourceLineNo">524</span> while (fs.exists(newPath)) {<a name="line.524"></a>
+<span class="sourceLineNo">525</span> this.filenum.incrementAndGet();<a name="line.525"></a>
+<span class="sourceLineNo">526</span> newPath = getCurrentFileName();<a name="line.526"></a>
+<span class="sourceLineNo">527</span> }<a name="line.527"></a>
+<span class="sourceLineNo">528</span> return newPath;<a name="line.528"></a>
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+<span class="sourceLineNo">530</span><a name="line.530"></a>
+<span class="sourceLineNo">531</span> @VisibleForTesting<a name="line.531"></a>
+<span class="sourceLineNo">532</span> Path getOldPath() {<a name="line.532"></a>
+<span class="sourceLineNo">533</span> long currentFilenum = this.filenum.get();<a name="line.533"></a>
+<span class="sourceLineNo">534</span> Path oldPath = null;<a name="line.534"></a>
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+<span class="sourceLineNo">536</span> // ComputeFilename will take care of meta wal filename<a name="line.536"></a>
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+<span class="sourceLineNo">538</span> } // I presume if currentFilenum is <= 0, this is first file and null for oldPath if fine?<a name="line.538"></a>
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+<span class="sourceLineNo">541</span><a name="line.541"></a>
+<span class="sourceLineNo">542</span> /**<a name="line.542"></a>
+<span class="sourceLineNo">543</span> * Tell listeners about pre log roll.<a name="line.543"></a>
+<span class="sourceLineNo">544</span> */<a name="line.544"></a>
+<span class="sourceLineNo">545</span> private void tellListenersAboutPreLogRoll(final Path oldPath, final Path newPath)<a name="line.545"></a>
+<span class="sourceLineNo">546</span> throws IOException {<a name="line.546"></a>
+<span class="sourceLineNo">547</span> coprocessorHost.preWALRoll(oldPath, newPath);<a name="line.547"></a>
+<span class="sourceLineNo">548</span><a name="line.548"></a>
+<span class="sourceLineNo">549</span> if (!this.listeners.isEmpty()) {<a name="line.549"></a>
+<span class="sourceLineNo">550</span> for (WALActionsListener i : this.listeners) {<a name="line.550"></a>
+<span class="sourceLineNo">551</span> i.preLogRoll(oldPath, newPath);<a name="line.551"></a>
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+<span class="sourceLineNo">553</span> }<a name="line.553"></a>
+<span class="sourceLineNo">554</span> }<a name="line.554"></a>
+<span class="sourceLineNo">555</span><a name="line.555"></a>
+<span class="sourceLineNo">556</span> /**<a name="line.556"></a>
+<span class="sourceLineNo">557</span> * Tell listeners about post log roll.<a name="line.557"></a>
+<span class="sourceLineNo">558</span> */<a name="line.558"></a>
+<span class="sourceLineNo">559</span> private void tellListenersAboutPostLogRoll(final Path oldPath, final Path newPath)<a name="line.559"></a>
+<span class="sourceLineNo">560</span> throws IOException {<a name="line.560"></a>
+<span class="sourceLineNo">561</span> if (!this.listeners.isEmpty()) {<a name="line.561"></a>
+<span class="sourceLineNo">562</span> for (WALActionsListener i : this.listeners) {<a name="line.562"></a>
+<span class="sourceLineNo">563</span> i.postLogRoll(oldPath, newPath);<a name="line.563"></a>
+<span class="sourceLineNo">564</span> }<a name="line.564"></a>
+<span class="sourceLineNo">565</span> }<a name="line.565"></a>
+<span class="sourceLineNo">566</span><a name="line.566"></a>
+<span class="sourceLineNo">567</span> coprocessorHost.postWALRoll(oldPath, newPath);<a name="line.567"></a>
+<span class="sourceLineNo">568</span> }<a name="line.568"></a>
+<span class="sourceLineNo">569</span><a name="line.569"></a>
+<span class="sourceLineNo">570</span> // public only until class moves to o.a.h.h.wal<a name="line.570"></a>
+<span class="sourceLineNo">571</span> /** @return the number of rolled log files */<a name="line.571"></a>
+<span class="sourceLineNo">572</span> public int getNumRolledLogFiles() {<a name="line.572"></a>
+<span class="sourceLineNo">573</span> return walFile2Props.size();<a name="line.573"></a>
+<span class="sourceLineNo">574</span> }<a name="line.574"></a>
+<span class="sourceLineNo">575</span><a name="line.575"></a>
+<span class="sourceLineNo">576</span> // public only until class moves to o.a.h.h.wal<a name="line.576"></a>
+<span class="sourceLineNo">577</span> /** @return the number of log files in use */<a name="line.577"></a>
+<span class="sourceLineNo">578</span> public int getNumLogFiles() {<a name="line.578"></a>
+<span class="sourceLineNo">579</span> // +1 for current use log<a name="line.579"></a>
+<span class="sourceLineNo">580</span> return getNumRolledLogFiles() + 1;<a name="line.580"></a>
+<span class="sourceLineNo">581</span> }<a name="line.581"></a>
+<span class="sourceLineNo">582</span><a name="line.582"></a>
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+<span class="sourceLineNo">586</span> * archived.<a name="line.586"></a>
+<span class="sourceLineNo">587</span> * @return regions (encodedRegionNames) to flush in order to archive oldest WAL file.<a name="line.587"></a>
+<span class="sourceLineNo">588</span> */<a name="line.588"></a>
+<span class="sourceLineNo">589</span> byte[][] findRegionsToForceFlush() throws IOException {<a name="line.589"></a>
+<span class="sourceLineNo">590</span> byte[][] regions = null;<a name="line.590"></a>
+<span class="sourceLineNo">591</span> int logCount = getNumRolledLogFiles();<a name="line.591"></a>
+<span class="sourceLineNo">592</span> if (logCount > this.maxLogs && logCount > 0) {<a name="line.592"></a>
+<span class="sourceLineNo">593</span> Map.Entry<Path, WalProps> firstWALEntry = this.walFile2Props.firstEntry();<a name="line.593"></a>
+<span class="sourceLineNo">594</span> regions =<a name="line.594"></a>
+<span class="sourceLineNo">595</span> this.sequenceIdAccounting.findLower(firstWALEntry.getValue().encodedName2HighestSequenceId);<a name="line.595"></a>
+<span class="sourceLineNo">596</span> }<a name="line.596"></a>
+<span class="sourceLineNo">597</span> if (regions != null) {<a name="line.597"></a>
+<span class="sourceLineNo">598</span> StringBuilder sb = new StringBuilder();<a name="line.598"></a>
+<span class="sourceLineNo">599</span> for (int i = 0; i < regions.length; i++) {<a name="line.599"></a>
+<span class="sourceLineNo">600</span> if (i > 0) {<a name="line.600"></a>
+<span class="sourceLineNo">601</span> sb.append(", ");<a name="line.601"></a>
+<span class="sourceLineNo">602</span> }<a name="line.602"></a>
+<span class="sourceLineNo">603</span> sb.append(Bytes.toStringBinary(regions[i]));<a name="line.603"></a>
+<span class="sourceLineNo">604</span> }<a name="line.604"></a>
+<span class="sourceLineNo">605</span> LOG.info("Too many WALs; count=" + logCount + ", max=" + this.maxLogs +<a name="line.605"></a>
+<span class="sourceLineNo">606</span> "; forcing flush of " + regions.length + " regions(s): " + sb.toString());<a name="line.606"></a>
+<span class="sourceLineNo">607</span> }<a name="line.607"></a>
+<span class="sourceLineNo">608</span> return regions;<a name="line.608"></a>
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+<span class="sourceLineNo">610</span><a name="line.610"></a>
+<span class="sourceLineNo">611</span> /**<a name="line.611"></a>
+<span class="sourceLineNo">612</span> * Archive old logs. A WAL is eligible for archiving if all its WALEdits have been flushed.<a nam
<TRUNCATED>