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Posted to commits@hbase.apache.org by gi...@apache.org on 2018/09/11 14:54:13 UTC

[09/25] hbase-site git commit: Published site at 2ab8122a24eb8444c2804b7f980bf008f395933d.

http://git-wip-us.apache.org/repos/asf/hbase-site/blob/dcc97e01/testdevapidocs/src-html/org/apache/hadoop/hbase/regionserver/TestHRegion.FlushThread.html
----------------------------------------------------------------------
diff --git a/testdevapidocs/src-html/org/apache/hadoop/hbase/regionserver/TestHRegion.FlushThread.html b/testdevapidocs/src-html/org/apache/hadoop/hbase/regionserver/TestHRegion.FlushThread.html
index f2a9072..d2de828 100644
--- a/testdevapidocs/src-html/org/apache/hadoop/hbase/regionserver/TestHRegion.FlushThread.html
+++ b/testdevapidocs/src-html/org/apache/hadoop/hbase/regionserver/TestHRegion.FlushThread.html
@@ -274,7 +274,7 @@
 <span class="sourceLineNo">266</span>    assertEquals(HConstants.NO_SEQNUM, region.getMaxFlushedSeqId());<a name="line.266"></a>
 <span class="sourceLineNo">267</span>    // Weird. This returns 0 if no store files or no edits. Afraid to change it.<a name="line.267"></a>
 <span class="sourceLineNo">268</span>    assertEquals(0, (long)region.getMaxStoreSeqId().get(COLUMN_FAMILY_BYTES));<a name="line.268"></a>
-<span class="sourceLineNo">269</span>    region.close();<a name="line.269"></a>
+<span class="sourceLineNo">269</span>    HBaseTestingUtility.closeRegionAndWAL(this.region);<a name="line.269"></a>
 <span class="sourceLineNo">270</span>    assertEquals(HConstants.NO_SEQNUM, region.getMaxFlushedSeqId());<a name="line.270"></a>
 <span class="sourceLineNo">271</span>    assertEquals(0, (long)region.getMaxStoreSeqId().get(COLUMN_FAMILY_BYTES));<a name="line.271"></a>
 <span class="sourceLineNo">272</span>    // Open region again.<a name="line.272"></a>
@@ -289,6035 +289,6038 @@
 <span class="sourceLineNo">281</span>    assertEquals(0, (long)region.getMaxStoreSeqId().get(COLUMN_FAMILY_BYTES));<a name="line.281"></a>
 <span class="sourceLineNo">282</span>    region.flush(true);<a name="line.282"></a>
 <span class="sourceLineNo">283</span>    long max = region.getMaxFlushedSeqId();<a name="line.283"></a>
-<span class="sourceLineNo">284</span>    region.close();<a name="line.284"></a>
+<span class="sourceLineNo">284</span>    HBaseTestingUtility.closeRegionAndWAL(this.region);<a name="line.284"></a>
 <span class="sourceLineNo">285</span>    assertEquals(max, region.getMaxFlushedSeqId());<a name="line.285"></a>
-<span class="sourceLineNo">286</span>  }<a name="line.286"></a>
-<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>   * Test for Bug 2 of HBASE-10466.<a name="line.289"></a>
-<span class="sourceLineNo">290</span>   * "Bug 2: Conditions for the first flush of region close (so-called pre-flush) If memstoreSize<a name="line.290"></a>
-<span class="sourceLineNo">291</span>   * is smaller than a certain value, or when region close starts a flush is ongoing, the first<a name="line.291"></a>
-<span class="sourceLineNo">292</span>   * flush is skipped and only the second flush takes place. However, two flushes are required in<a name="line.292"></a>
-<span class="sourceLineNo">293</span>   * case previous flush fails and leaves some data in snapshot. The bug could cause loss of data<a name="line.293"></a>
-<span class="sourceLineNo">294</span>   * in current memstore. The fix is removing all conditions except abort check so we ensure 2<a name="line.294"></a>
-<span class="sourceLineNo">295</span>   * flushes for region close."<a name="line.295"></a>
-<span class="sourceLineNo">296</span>   * @throws IOException<a name="line.296"></a>
-<span class="sourceLineNo">297</span>   */<a name="line.297"></a>
-<span class="sourceLineNo">298</span>  @Test<a name="line.298"></a>
-<span class="sourceLineNo">299</span>  public void testCloseCarryingSnapshot() throws IOException {<a name="line.299"></a>
-<span class="sourceLineNo">300</span>    region = initHRegion(tableName, method, CONF, COLUMN_FAMILY_BYTES);<a name="line.300"></a>
-<span class="sourceLineNo">301</span>    HStore store = region.getStore(COLUMN_FAMILY_BYTES);<a name="line.301"></a>
-<span class="sourceLineNo">302</span>    // Get some random bytes.<a name="line.302"></a>
-<span class="sourceLineNo">303</span>    byte [] value = Bytes.toBytes(method);<a name="line.303"></a>
-<span class="sourceLineNo">304</span>    // Make a random put against our cf.<a name="line.304"></a>
-<span class="sourceLineNo">305</span>    Put put = new Put(value);<a name="line.305"></a>
-<span class="sourceLineNo">306</span>    put.addColumn(COLUMN_FAMILY_BYTES, null, value);<a name="line.306"></a>
-<span class="sourceLineNo">307</span>    // First put something in current memstore, which will be in snapshot after flusher.prepare()<a name="line.307"></a>
-<span class="sourceLineNo">308</span>    region.put(put);<a name="line.308"></a>
-<span class="sourceLineNo">309</span>    StoreFlushContext storeFlushCtx = store.createFlushContext(12345, FlushLifeCycleTracker.DUMMY);<a name="line.309"></a>
-<span class="sourceLineNo">310</span>    storeFlushCtx.prepare();<a name="line.310"></a>
-<span class="sourceLineNo">311</span>    // Second put something in current memstore<a name="line.311"></a>
-<span class="sourceLineNo">312</span>    put.addColumn(COLUMN_FAMILY_BYTES, Bytes.toBytes("abc"), value);<a name="line.312"></a>
-<span class="sourceLineNo">313</span>    region.put(put);<a name="line.313"></a>
-<span class="sourceLineNo">314</span>    // Close with something in memstore and something in the snapshot.  Make sure all is cleared.<a name="line.314"></a>
-<span class="sourceLineNo">315</span>    region.close();<a name="line.315"></a>
-<span class="sourceLineNo">316</span>    assertEquals(0, region.getMemStoreDataSize());<a name="line.316"></a>
-<span class="sourceLineNo">317</span>    HBaseTestingUtility.closeRegionAndWAL(region);<a name="line.317"></a>
-<span class="sourceLineNo">318</span>  }<a name="line.318"></a>
-<span class="sourceLineNo">319</span><a name="line.319"></a>
-<span class="sourceLineNo">320</span>  /*<a name="line.320"></a>
-<span class="sourceLineNo">321</span>   * This test is for verifying memstore snapshot size is correctly updated in case of rollback<a name="line.321"></a>
-<span class="sourceLineNo">322</span>   * See HBASE-10845<a name="line.322"></a>
-<span class="sourceLineNo">323</span>   */<a name="line.323"></a>
-<span class="sourceLineNo">324</span>  @Test<a name="line.324"></a>
-<span class="sourceLineNo">325</span>  public void testMemstoreSnapshotSize() throws IOException {<a name="line.325"></a>
-<span class="sourceLineNo">326</span>    class MyFaultyFSLog extends FaultyFSLog {<a name="line.326"></a>
-<span class="sourceLineNo">327</span>      StoreFlushContext storeFlushCtx;<a name="line.327"></a>
-<span class="sourceLineNo">328</span>      public MyFaultyFSLog(FileSystem fs, Path rootDir, String logName, Configuration conf)<a name="line.328"></a>
-<span class="sourceLineNo">329</span>          throws IOException {<a name="line.329"></a>
-<span class="sourceLineNo">330</span>        super(fs, rootDir, logName, conf);<a name="line.330"></a>
-<span class="sourceLineNo">331</span>      }<a name="line.331"></a>
-<span class="sourceLineNo">332</span><a name="line.332"></a>
-<span class="sourceLineNo">333</span>      void setStoreFlushCtx(StoreFlushContext storeFlushCtx) {<a name="line.333"></a>
-<span class="sourceLineNo">334</span>        this.storeFlushCtx = storeFlushCtx;<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>      @Override<a name="line.337"></a>
-<span class="sourceLineNo">338</span>      public void sync(long txid) throws IOException {<a name="line.338"></a>
-<span class="sourceLineNo">339</span>        storeFlushCtx.prepare();<a name="line.339"></a>
-<span class="sourceLineNo">340</span>        super.sync(txid);<a name="line.340"></a>
-<span class="sourceLineNo">341</span>      }<a name="line.341"></a>
-<span class="sourceLineNo">342</span>    }<a name="line.342"></a>
-<span class="sourceLineNo">343</span><a name="line.343"></a>
-<span class="sourceLineNo">344</span>    FileSystem fs = FileSystem.get(CONF);<a name="line.344"></a>
-<span class="sourceLineNo">345</span>    Path rootDir = new Path(dir + "testMemstoreSnapshotSize");<a name="line.345"></a>
-<span class="sourceLineNo">346</span>    MyFaultyFSLog faultyLog = new MyFaultyFSLog(fs, rootDir, "testMemstoreSnapshotSize", CONF);<a name="line.346"></a>
-<span class="sourceLineNo">347</span>    faultyLog.init();<a name="line.347"></a>
-<span class="sourceLineNo">348</span>    region = initHRegion(tableName, null, null, false, Durability.SYNC_WAL, faultyLog,<a name="line.348"></a>
-<span class="sourceLineNo">349</span>        COLUMN_FAMILY_BYTES);<a name="line.349"></a>
-<span class="sourceLineNo">350</span><a name="line.350"></a>
-<span class="sourceLineNo">351</span>    HStore store = region.getStore(COLUMN_FAMILY_BYTES);<a name="line.351"></a>
-<span class="sourceLineNo">352</span>    // Get some random bytes.<a name="line.352"></a>
-<span class="sourceLineNo">353</span>    byte [] value = Bytes.toBytes(method);<a name="line.353"></a>
-<span class="sourceLineNo">354</span>    faultyLog.setStoreFlushCtx(store.createFlushContext(12345, FlushLifeCycleTracker.DUMMY));<a name="line.354"></a>
-<span class="sourceLineNo">355</span><a name="line.355"></a>
-<span class="sourceLineNo">356</span>    Put put = new Put(value);<a name="line.356"></a>
-<span class="sourceLineNo">357</span>    put.addColumn(COLUMN_FAMILY_BYTES, Bytes.toBytes("abc"), value);<a name="line.357"></a>
-<span class="sourceLineNo">358</span>    faultyLog.setFailureType(FaultyFSLog.FailureType.SYNC);<a name="line.358"></a>
-<span class="sourceLineNo">359</span>    boolean threwIOE = false;<a name="line.359"></a>
-<span class="sourceLineNo">360</span>    try {<a name="line.360"></a>
-<span class="sourceLineNo">361</span>      region.put(put);<a name="line.361"></a>
-<span class="sourceLineNo">362</span>    } catch (IOException ioe) {<a name="line.362"></a>
-<span class="sourceLineNo">363</span>      threwIOE = true;<a name="line.363"></a>
-<span class="sourceLineNo">364</span>    } finally {<a name="line.364"></a>
-<span class="sourceLineNo">365</span>      assertTrue("The regionserver should have thrown an exception", threwIOE);<a name="line.365"></a>
-<span class="sourceLineNo">366</span>    }<a name="line.366"></a>
-<span class="sourceLineNo">367</span>    MemStoreSize mss = store.getFlushableSize();<a name="line.367"></a>
-<span class="sourceLineNo">368</span>    assertTrue("flushable size should be zero, but it is " + mss,<a name="line.368"></a>
-<span class="sourceLineNo">369</span>        mss.getDataSize() == 0);<a name="line.369"></a>
-<span class="sourceLineNo">370</span>  }<a name="line.370"></a>
-<span class="sourceLineNo">371</span><a name="line.371"></a>
-<span class="sourceLineNo">372</span>  /**<a name="line.372"></a>
-<span class="sourceLineNo">373</span>   * Create a WAL outside of the usual helper in<a name="line.373"></a>
-<span class="sourceLineNo">374</span>   * {@link HBaseTestingUtility#createWal(Configuration, Path, RegionInfo)} because that method<a name="line.374"></a>
-<span class="sourceLineNo">375</span>   * doesn't play nicely with FaultyFileSystem. Call this method before overriding<a name="line.375"></a>
-<span class="sourceLineNo">376</span>   * {@code fs.file.impl}.<a name="line.376"></a>
-<span class="sourceLineNo">377</span>   * @param callingMethod a unique component for the path, probably the name of the test method.<a name="line.377"></a>
-<span class="sourceLineNo">378</span>   */<a name="line.378"></a>
-<span class="sourceLineNo">379</span>  private static WAL createWALCompatibleWithFaultyFileSystem(String callingMethod,<a name="line.379"></a>
-<span class="sourceLineNo">380</span>      Configuration conf, TableName tableName) throws IOException {<a name="line.380"></a>
-<span class="sourceLineNo">381</span>    final Path logDir = TEST_UTIL.getDataTestDirOnTestFS(callingMethod + ".log");<a name="line.381"></a>
-<span class="sourceLineNo">382</span>    final Configuration walConf = new Configuration(conf);<a name="line.382"></a>
-<span class="sourceLineNo">383</span>    FSUtils.setRootDir(walConf, logDir);<a name="line.383"></a>
-<span class="sourceLineNo">384</span>    return new WALFactory(walConf, callingMethod)<a name="line.384"></a>
-<span class="sourceLineNo">385</span>        .getWAL(RegionInfoBuilder.newBuilder(tableName).build());<a name="line.385"></a>
-<span class="sourceLineNo">386</span>  }<a name="line.386"></a>
-<span class="sourceLineNo">387</span><a name="line.387"></a>
-<span class="sourceLineNo">388</span>  @Test<a name="line.388"></a>
-<span class="sourceLineNo">389</span>  public void testMemstoreSizeAccountingWithFailedPostBatchMutate() throws IOException {<a name="line.389"></a>
-<span class="sourceLineNo">390</span>    String testName = "testMemstoreSizeAccountingWithFailedPostBatchMutate";<a name="line.390"></a>
-<span class="sourceLineNo">391</span>    FileSystem fs = FileSystem.get(CONF);<a name="line.391"></a>
-<span class="sourceLineNo">392</span>    Path rootDir = new Path(dir + testName);<a name="line.392"></a>
-<span class="sourceLineNo">393</span>    FSHLog hLog = new FSHLog(fs, rootDir, testName, CONF);<a name="line.393"></a>
-<span class="sourceLineNo">394</span>    hLog.init();<a name="line.394"></a>
-<span class="sourceLineNo">395</span>    region = initHRegion(tableName, null, null, false, Durability.SYNC_WAL, hLog,<a name="line.395"></a>
-<span class="sourceLineNo">396</span>        COLUMN_FAMILY_BYTES);<a name="line.396"></a>
-<span class="sourceLineNo">397</span>    HStore store = region.getStore(COLUMN_FAMILY_BYTES);<a name="line.397"></a>
-<span class="sourceLineNo">398</span>    assertEquals(0, region.getMemStoreDataSize());<a name="line.398"></a>
-<span class="sourceLineNo">399</span><a name="line.399"></a>
-<span class="sourceLineNo">400</span>    // Put one value<a name="line.400"></a>
-<span class="sourceLineNo">401</span>    byte [] value = Bytes.toBytes(method);<a name="line.401"></a>
-<span class="sourceLineNo">402</span>    Put put = new Put(value);<a name="line.402"></a>
-<span class="sourceLineNo">403</span>    put.addColumn(COLUMN_FAMILY_BYTES, Bytes.toBytes("abc"), value);<a name="line.403"></a>
-<span class="sourceLineNo">404</span>    region.put(put);<a name="line.404"></a>
-<span class="sourceLineNo">405</span>    long onePutSize = region.getMemStoreDataSize();<a name="line.405"></a>
-<span class="sourceLineNo">406</span>    assertTrue(onePutSize &gt; 0);<a name="line.406"></a>
-<span class="sourceLineNo">407</span><a name="line.407"></a>
-<span class="sourceLineNo">408</span>    RegionCoprocessorHost mockedCPHost = Mockito.mock(RegionCoprocessorHost.class);<a name="line.408"></a>
-<span class="sourceLineNo">409</span>    doThrow(new IOException())<a name="line.409"></a>
-<span class="sourceLineNo">410</span>       .when(mockedCPHost).postBatchMutate(Mockito.&lt;MiniBatchOperationInProgress&lt;Mutation&gt;&gt;any());<a name="line.410"></a>
-<span class="sourceLineNo">411</span>    region.setCoprocessorHost(mockedCPHost);<a name="line.411"></a>
-<span class="sourceLineNo">412</span><a name="line.412"></a>
-<span class="sourceLineNo">413</span>    put = new Put(value);<a name="line.413"></a>
-<span class="sourceLineNo">414</span>    put.addColumn(COLUMN_FAMILY_BYTES, Bytes.toBytes("dfg"), value);<a name="line.414"></a>
-<span class="sourceLineNo">415</span>    try {<a name="line.415"></a>
-<span class="sourceLineNo">416</span>      region.put(put);<a name="line.416"></a>
-<span class="sourceLineNo">417</span>      fail("Should have failed with IOException");<a name="line.417"></a>
-<span class="sourceLineNo">418</span>    } catch (IOException expected) {<a name="line.418"></a>
-<span class="sourceLineNo">419</span>    }<a name="line.419"></a>
-<span class="sourceLineNo">420</span>    long expectedSize = onePutSize * 2;<a name="line.420"></a>
-<span class="sourceLineNo">421</span>    assertEquals("memstoreSize should be incremented",<a name="line.421"></a>
-<span class="sourceLineNo">422</span>        expectedSize, region.getMemStoreDataSize());<a name="line.422"></a>
-<span class="sourceLineNo">423</span>    assertEquals("flushable size should be incremented",<a name="line.423"></a>
-<span class="sourceLineNo">424</span>        expectedSize, store.getFlushableSize().getDataSize());<a name="line.424"></a>
-<span class="sourceLineNo">425</span><a name="line.425"></a>
-<span class="sourceLineNo">426</span>    region.setCoprocessorHost(null);<a name="line.426"></a>
-<span class="sourceLineNo">427</span>  }<a name="line.427"></a>
-<span class="sourceLineNo">428</span><a name="line.428"></a>
-<span class="sourceLineNo">429</span>  /**<a name="line.429"></a>
-<span class="sourceLineNo">430</span>   * A test case of HBASE-21041<a name="line.430"></a>
-<span class="sourceLineNo">431</span>   * @throws Exception Exception<a name="line.431"></a>
-<span class="sourceLineNo">432</span>   */<a name="line.432"></a>
-<span class="sourceLineNo">433</span>  @Test<a name="line.433"></a>
-<span class="sourceLineNo">434</span>  public void testFlushAndMemstoreSizeCounting() throws Exception {<a name="line.434"></a>
-<span class="sourceLineNo">435</span>    byte[] family = Bytes.toBytes("family");<a name="line.435"></a>
-<span class="sourceLineNo">436</span>    this.region = initHRegion(tableName, method, CONF, family);<a name="line.436"></a>
-<span class="sourceLineNo">437</span>    final WALFactory wals = new WALFactory(CONF, method);<a name="line.437"></a>
-<span class="sourceLineNo">438</span>    try {<a name="line.438"></a>
-<span class="sourceLineNo">439</span>      for (byte[] row : HBaseTestingUtility.ROWS) {<a name="line.439"></a>
-<span class="sourceLineNo">440</span>        Put put = new Put(row);<a name="line.440"></a>
-<span class="sourceLineNo">441</span>        put.addColumn(family, family, row);<a name="line.441"></a>
-<span class="sourceLineNo">442</span>        region.put(put);<a name="line.442"></a>
-<span class="sourceLineNo">443</span>      }<a name="line.443"></a>
-<span class="sourceLineNo">444</span>      region.flush(true);<a name="line.444"></a>
-<span class="sourceLineNo">445</span>      // After flush, data size should be zero<a name="line.445"></a>
-<span class="sourceLineNo">446</span>      assertEquals(0, region.getMemStoreDataSize());<a name="line.446"></a>
-<span class="sourceLineNo">447</span>      // After flush, a new active mutable segment is created, so the heap size<a name="line.447"></a>
-<span class="sourceLineNo">448</span>      // should equal to MutableSegment.DEEP_OVERHEAD<a name="line.448"></a>
-<span class="sourceLineNo">449</span>      assertEquals(MutableSegment.DEEP_OVERHEAD, region.getMemStoreHeapSize());<a name="line.449"></a>
-<span class="sourceLineNo">450</span>      // After flush, offheap should be zero<a name="line.450"></a>
-<span class="sourceLineNo">451</span>      assertEquals(0, region.getMemStoreOffHeapSize());<a name="line.451"></a>
-<span class="sourceLineNo">452</span>    } finally {<a name="line.452"></a>
-<span class="sourceLineNo">453</span>      HBaseTestingUtility.closeRegionAndWAL(this.region);<a name="line.453"></a>
-<span class="sourceLineNo">454</span>      this.region = null;<a name="line.454"></a>
-<span class="sourceLineNo">455</span>      wals.close();<a name="line.455"></a>
-<span class="sourceLineNo">456</span>    }<a name="line.456"></a>
-<span class="sourceLineNo">457</span>  }<a name="line.457"></a>
-<span class="sourceLineNo">458</span><a name="line.458"></a>
-<span class="sourceLineNo">459</span>  /**<a name="line.459"></a>
-<span class="sourceLineNo">460</span>   * Test we do not lose data if we fail a flush and then close.<a name="line.460"></a>
-<span class="sourceLineNo">461</span>   * Part of HBase-10466.  Tests the following from the issue description:<a name="line.461"></a>
-<span class="sourceLineNo">462</span>   * "Bug 1: Wrong calculation of HRegion.memstoreSize: When a flush fails, data to be flushed is<a name="line.462"></a>
-<span class="sourceLineNo">463</span>   * kept in each MemStore's snapshot and wait for next flush attempt to continue on it. But when<a name="line.463"></a>
-<span class="sourceLineNo">464</span>   * the next flush succeeds, the counter of total memstore size in HRegion is always deduced by<a name="line.464"></a>
-<span class="sourceLineNo">465</span>   * the sum of current memstore sizes instead of snapshots left from previous failed flush. This<a name="line.465"></a>
-<span class="sourceLineNo">466</span>   * calculation is problematic that almost every time there is failed flush, HRegion.memstoreSize<a name="line.466"></a>
-<span class="sourceLineNo">467</span>   * gets reduced by a wrong value. If region flush could not proceed for a couple cycles, the size<a name="line.467"></a>
-<span class="sourceLineNo">468</span>   * in current memstore could be much larger than the snapshot. It's likely to drift memstoreSize<a name="line.468"></a>
-<span class="sourceLineNo">469</span>   * much smaller than expected. In extreme case, if the error accumulates to even bigger than<a name="line.469"></a>
-<span class="sourceLineNo">470</span>   * HRegion's memstore size limit, any further flush is skipped because flush does not do anything<a name="line.470"></a>
-<span class="sourceLineNo">471</span>   * if memstoreSize is not larger than 0."<a name="line.471"></a>
-<span class="sourceLineNo">472</span>   * @throws Exception<a name="line.472"></a>
-<span class="sourceLineNo">473</span>   */<a name="line.473"></a>
-<span class="sourceLineNo">474</span>  @Test<a name="line.474"></a>
-<span class="sourceLineNo">475</span>  public void testFlushSizeAccounting() throws Exception {<a name="line.475"></a>
-<span class="sourceLineNo">476</span>    final Configuration conf = HBaseConfiguration.create(CONF);<a name="line.476"></a>
-<span class="sourceLineNo">477</span>    final WAL wal = createWALCompatibleWithFaultyFileSystem(method, conf, tableName);<a name="line.477"></a>
-<span class="sourceLineNo">478</span>    // Only retry once.<a name="line.478"></a>
-<span class="sourceLineNo">479</span>    conf.setInt("hbase.hstore.flush.retries.number", 1);<a name="line.479"></a>
-<span class="sourceLineNo">480</span>    final User user =<a name="line.480"></a>
-<span class="sourceLineNo">481</span>      User.createUserForTesting(conf, method, new String[]{"foo"});<a name="line.481"></a>
-<span class="sourceLineNo">482</span>    // Inject our faulty LocalFileSystem<a name="line.482"></a>
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