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Posted to commits@hbase.apache.org by gi...@apache.org on 2018/03/20 14:53:45 UTC
[13/18] hbase-site git commit: Published site at
2a3f4a0a4eb7bb67985050b0e007576c468f217e.
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+<span class="sourceLineNo">171</span> */<a name="line.171"></a>
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+<span class="sourceLineNo">176</span> if (host.equals(currentHost)) {<a name="line.176"></a>
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+<span class="sourceLineNo">178</span> }<a name="line.178"></a>
+<span class="sourceLineNo">179</span> topHosts.add(host);<a name="line.179"></a>
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+<span class="sourceLineNo">183</span><a name="line.183"></a>
+<span class="sourceLineNo">184</span> /**<a name="line.184"></a>
+<span class="sourceLineNo">185</span> * Returns an ordered list of hosts that are hosting the blocks for this<a name="line.185"></a>
+<span class="sourceLineNo">186</span> * region. The weight of each host is the sum of the block lengths of all<a name="line.186"></a>
+<span class="sourceLineNo">187</span> * files on that host, so the first host in the list is the server which holds<a name="line.187"></a>
+<span class="sourceLineNo">188</span> * the most bytes of the given region's HFiles.<a name="line.188"></a>
+<span class="sourceLineNo">189</span> *<a name="line.189"></a>
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+<span class="sourceLineNo">195</span> TableDescriptor tableDescriptor = getTableDescriptor(region.getTable());<a name="line.195"></a>
+<span class="sourceLineNo">196</span> if (tableDescriptor != null) {<a name="line.196"></a>
+<span class="sourceLineNo">197</span> HDFSBlocksDistribution blocksDistribution =<a name="line.197"></a>
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+<span class="sourceLineNo">201</span> } catch (IOException ioe) {<a name="line.201"></a>
+<span class="sourceLineNo">202</span> LOG.warn("IOException during HDFSBlocksDistribution computation. for " + "region = "<a name="line.202"></a>
+<span class="sourceLineNo">203</span> + region.getEncodedName(), ioe);<a name="line.203"></a>
+<span class="sourceLineNo">204</span> }<a name="line.204"></a>
+<span class="sourceLineNo">205</span><a name="line.205"></a>
+<span class="sourceLineNo">206</span> return EMPTY_BLOCK_DISTRIBUTION;<a name="line.206"></a>
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+<span class="sourceLineNo">208</span><a name="line.208"></a>
+<span class="sourceLineNo">209</span> /**<a name="line.209"></a>
+<span class="sourceLineNo">210</span> * return TableDescriptor for a given tableName<a name="line.210"></a>
+<span class="sourceLineNo">211</span> *<a name="line.211"></a>
+<span class="sourceLineNo">212</span> * @param tableName the table name<a name="line.212"></a>
+<span class="sourceLineNo">213</span> * @return TableDescriptor<a name="line.213"></a>
+<span class="sourceLineNo">214</span> * @throws IOException<a name="line.214"></a>
+<span class="sourceLineNo">215</span> */<a name="line.215"></a>
+<span class="sourceLineNo">216</span> protected TableDescriptor getTableDescriptor(TableName tableName) throws IOException {<a name="line.216"></a>
+<span class="sourceLineNo">217</span> TableDescriptor tableDescriptor = null;<a name="line.217"></a>
+<span class="sourceLineNo">218</span> try {<a name="line.218"></a>
+<span class="sourceLineNo">219</span> if (this.services != null && this.services.getTableDescriptors() != null) {<a name="line.219"></a>
+<span class="sourceLineNo">220</span> tableDescriptor = this.services.getTableDescriptors().get(tableName);<a name="line.220"></a>
+<span class="sourceLineNo">221</span> }<a name="line.221"></a>
+<span class="sourceLineNo">222</span> } catch (FileNotFoundException fnfe) {<a name="line.222"></a>
+<span class="sourceLineNo">223</span> LOG.debug("FileNotFoundException during getTableDescriptors." + " Current table name = "<a name="line.223"></a>
+<span class="sourceLineNo">224</span> + tableName, fnfe);<a name="line.224"></a>
+<span class="sourceLineNo">225</span> }<a name="line.225"></a>
+<span class="sourceLineNo">226</span><a name="line.226"></a>
+<span class="sourceLineNo">227</span> return tableDescriptor;<a name="line.227"></a>
+<span class="sourceLineNo">228</span> }<a name="line.228"></a>
+<span class="sourceLineNo">229</span><a name="line.229"></a>
+<span class="sourceLineNo">230</span> /**<a name="line.230"></a>
+<span class="sourceLineNo">231</span> * Map hostname to ServerName, The output ServerName list will have the same<a name="line.231"></a>
+<span class="sourceLineNo">232</span> * order as input hosts.<a name="line.232"></a>
+<span class="sourceLineNo">233</span> *<a name="line.233"></a>
+<span class="sourceLineNo">234</span> * @param hosts the list of hosts<a name="line.234"></a>
+<span class="sourceLineNo">235</span> * @return ServerName list<a name="line.235"></a>
+<span class="sourceLineNo">236</span> */<a name="line.236"></a>
+<span class="sourceLineNo">237</span> protected List<ServerName> mapHostNameToServerName(List<String> hosts) {<a name="line.237"></a>
+<span class="sourceLineNo">238</span> if (hosts == null || status == null) {<a name="line.238"></a>
+<span class="sourceLineNo">239</span> if (hosts == null) {<a name="line.239"></a>
+<span class="sourceLineNo">240</span> LOG.warn("RegionLocationFinder top hosts is null");<a name="line.240"></a>
+<span class="sourceLineNo">241</span> }<a name="line.241"></a>
+<span class="sourceLineNo">242</span> return Lists.newArrayList();<a name="line.242"></a>
+<span class="sourceLineNo">243</span> }<a name="line.243"></a>
+<span class="sourceLineNo">244</span><a name="line.244"></a>
+<span class="sourceLineNo">245</span> List<ServerName> topServerNames = new ArrayList<>();<a name="line.245"></a>
+<span class="sourceLineNo">246</span> Collection<ServerName> regionServers = status.getLiveServerMetrics().keySet();<a name="line.246"></a>
+<span class="sourceLineNo">247</span><a name="line.247"></a>
+<span class="sourceLineNo">248</span> // create a mapping from hostname to ServerName for fast lookup<a name="line.248"></a>
+<span class="sourceLineNo">249</span> HashMap<String, List<ServerName>> hostToServerName = new HashMap<>();<a name="line.249"></a>
+<span class="sourceLineNo">250</span> for (ServerName sn : regionServers) {<a name="line.250"></a>
+<span class="sourceLineNo">251</span> String host = sn.getHostname();<a name="line.251"></a>
+<span class="sourceLineNo">252</span> if (!hostToServerName.containsKey(host)) {<a name="line.252"></a>
+<span class="sourceLineNo">253</span> hostToServerName.put(host, new ArrayList<>());<a name="line.253"></a>
+<span class="sourceLineNo">254</span> }<a name="line.254"></a>
+<span class="sourceLineNo">255</span> hostToServerName.get(host).add(sn);<a name="line.255"></a>
+<span class="sourceLineNo">256</span> }<a name="line.256"></a>
+<span class="sourceLineNo">257</span><a name="line.257"></a>
+<span class="sourceLineNo">258</span> for (String host : hosts) {<a name="line.258"></a>
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+<span class="sourceLineNo">260</span> continue;<a name="line.260"></a>
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+<span class="sourceLineNo">264</span> // but RS is down ( thus sn is null )<a name="line.264"></a>
+<span class="sourceLineNo">265</span> if (sn != null) {<a name="line.265"></a>
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+<span class="sourceLineNo">267</span> }<a name="line.267"></a>
+<span class="sourceLineNo">268</span> }<a name="line.268"></a>
+<span class="sourceLineNo">269</span> }<a name="line.269"></a>
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+<span class="sourceLineNo">271</span> }<a name="line.271"></a>
+<span class="sourceLineNo">272</span><a name="line.272"></a>
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+<span class="sourceLineNo">275</span> try {<a name="line.275"></a>
+<span class="sourceLineNo">276</span> if (cache.asMap().containsKey(hri)) {<a name="line.276"></a>
+<span class="sourceLineNo">277</span> blockDistbn = cache.get(hri);<a name="line.277"></a>
+<span class="sourceLineNo">278</span> return blockDistbn;<a name="line.278"></a>
+<span class="sourceLineNo">279</span> } else {<a name="line.279"></a>
+<span class="sourceLineNo">280</span> LOG.debug("HDFSBlocksDistribution not found in cache for region "<a name="line.280"></a>
+<span class="sourceLineNo">281</span> + hri.getRegionNameAsString());<a name="line.281"></a>
+<span class="sourceLineNo">282</span> blockDistbn = internalGetTopBlockLocation(hri);<a name="line.282"></a>
+<span class="sourceLineNo">283</span> cache.put(hri, blockDistbn);<a name="line.283"></a>
+<span class="sourceLineNo">284</span> return blockDistbn;<a name="line.284"></a>
+<span class="sourceLineNo">285</span> }<a name="line.285"></a>
+<span class="sourceLineNo">286</span> } catch (ExecutionException e) {<a name="line.286"></a>
+<span class="sourceLineNo">287</span> LOG.warn("Error while fetching cache entry ", e);<a name="line.287"></a>
+<span class="sourceLineNo">288</span> blockDistbn = internalGetTopBlockLocation(hri);<a name="line.288"></a>
+<span class="sourceLineNo">289</span> cache.put(hri, blockDistbn);<a name="line.289"></a>
+<span class="sourceLineNo">290</span> return blockDistbn;<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> private ListenableFuture<HDFSBlocksDistribution> asyncGetBlockDistribution(<a name="line.294"></a>
+<span class="sourceLineNo">295</span> RegionInfo hri) {<a name="line.295"></a>
+<span class="sourceLineNo">296</span> try {<a name="line.296"></a>
+<span class="sourceLineNo">297</span> return loader.reload(hri, EMPTY_BLOCK_DISTRIBUTION);<a name="line.297"></a>
+<span class="sourceLineNo">298</span> } catch (Exception e) {<a name="line.298"></a>
+<span class="sourceLineNo">299</span> return Futures.immediateFuture(EMPTY_BLOCK_DISTRIBUTION);<a name="line.299"></a>
+<span class="sourceLineNo">300</span> }<a name="line.300"></a>
+<span class="sourceLineNo">301</span> }<a name="line.301"></a>
+<span class="sourceLineNo">302</span><a name="line.302"></a>
+<span class="sourceLineNo">303</span> public void refreshAndWait(Collection<RegionInfo> hris) {<a name="line.303"></a>
+<span class="sourceLineNo">304</span> ArrayList<ListenableFuture<HDFSBlocksDistribution>> regionLocationFutures = new ArrayList<>(hris.size());<a name="line.304"></a>
+<span class="sourceLineNo">305</span> for (RegionInfo hregionInfo : hris) {<a name="line.305"></a>
+<span class="sourceLineNo">306</span> regionLocationFutures.add(asyncGetBlockDistribution(hregionInfo));<a name="line.306"></a>
+<span class="sourceLineNo">307</span> }<a name="line.307"></a>
+<span class="sourceLineNo">308</span> int index = 0;<a name="line.308"></a>
+<span class="sourceLineNo">309</span> for (RegionInfo hregionInfo : hris) {<a name="line.309"></a>
+<span class="sourceLineNo">310</span> ListenableFuture<HDFSBlocksDistribution> future = regionLocationFutures<a name="line.310"></a>
+<span class="sourceLineNo">311</span> .get(index);<a name="line.311"></a>
+<span class="sourceLineNo">312</span> try {<a name="line.312"></a>
+<span class="sourceLineNo">313</span> cache.put(hregionInfo, future.get());<a name="line.313"></a>
+<span class="sourceLineNo">314</span> } catch (InterruptedException ite) {<a name="line.314"></a>
+<span class="sourceLineNo">315</span> Thread.currentThread().interrupt();<a name="line.315"></a>
+<span class="sourceLineNo">316</span> } catch (ExecutionException ee) {<a name="line.316"></a>
+<span class="sourceLineNo">317</span> LOG.debug(<a name="line.317"></a>
+<span class="sourceLineNo">318</span> "ExecutionException during HDFSBlocksDistribution computation. for region = "<a name="line.318"></a>
+<span class="sourceLineNo">319</span> + hregionInfo.getEncodedName(), ee);<a name="line.319"></a>
+<span class="sourceLineNo">320</span> }<a name="line.320"></a>
+<span class="sourceLineNo">321</span> index++;<a name="line.321"></a>
+<span class="sourceLineNo">322</span> }<a name="line.322"></a>
+<span class="sourceLineNo">323</span> }<a name="line.323"></a>
+<span class="sourceLineNo">324</span><a name="line.324"></a>
+<span class="sourceLineNo">325</span> // For test<a name="line.325"></a>
+<span class="sourceLineNo">326</span> LoadingCache<RegionInfo, HDFSBlocksDistribution> getCache() {<a name="line.326"></a>
+<span class="sourceLineNo">327</span> return cache;<a name="line.327"></a>
+<span class="sourceLineNo">328</span> }<a name="line.328"></a>
+<span class="sourceLineNo">329</span>}<a name="line.329"></a>