Examples of org.apache.hadoop.hbase.regionserver.HRegion.flushcache()

Package org.apache.hadoop.hbase.regionserver

Class org.apache.hadoop.hbase.regionserver.HRegion

Examples of org.apache.hadoop.hbase.regionserver.HRegion.flushcache()

org.apache.hadoop.hbase.regionserver.HRegion.flushcache()
Flush the cache. When this method is called the cache will be flushed unless:
1. the cache is empty
2. the region is closed.
3. a flush is already in progress
4. writes are disabled
This method may block for some time, so it should not be called from a time-sensitive thread. @return true if cache was flushed @throws IOException general io exceptions @throws DroppedSnapshotException Thrown when replay of hlog is requiredbecause a Snapshot was not properly persisted.

    Result result = region.get(g, null);
    assertEquals(countPerFamily * htd.getFamilies().size(),
      result.size());


    // Let us flush the region
    region.flushcache();
    region.close(true);
    wal.close();


    // delete the store files in the second column family to simulate a failure
    // in between the flushcache();

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    assertEquals(writtenRowCount, getScannedCount(scanner));


    // Let us flush the region
    throwExceptionWhenFlushing.set(true);
    try {
      region.flushcache();
      fail("Injected exception hasn't been thrown");
    } catch (Throwable t) {
      LOG.info("Expected simulated exception when flushing region,"
          + t.getMessage());
      // simulated to abort server

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    }
    writtenRowCount += moreRow;
    // call flush again
    throwExceptionWhenFlushing.set(false);
    try {
      region.flushcache();
    } catch (IOException t) {
      LOG.info("Expected exception when flushing region because server is stopped,"
          + t.getMessage());
    }

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    // get the seq no after first set of entries.
    long sequenceNumber = wal.getSequenceNumber();


    // Let us flush the region
    // But this time completeflushcache is not yet done
    region.flushcache();
    for (HColumnDescriptor hcd : htd.getFamilies()) {
      addRegionEdits(rowName, hcd.getName(), 5, this.ee, region, "x");
    }
    long lastestSeqNumber = wal.getSequenceNumber();
    // get the current seq no

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    boolean first = true;
    for (HColumnDescriptor hcd: htd.getFamilies()) {
      addRegionEdits(rowName, hcd.getName(), countPerFamily, this.ee, region, "x");
      if (first ) {
        // If first, so we have at least one family w/ different seqid to rest.
        region.flushcache();
        first = false;
      }
    }
    // Now assert edits made it in.
    final Get g = new Get(rowName);

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    put4.add(HConstants.CATALOG_FAMILY, null, four);
    table.put(put1);
    table.put(put2);
    table.put(put3);
    table.put(put4);
    region.flushcache();
    Result result = null;


    // Test before first that null is returned
    result = table.getRowOrBefore(beforeFirstRow, HConstants.CATALOG_FAMILY);
    assertTrue(result == null);

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    assertEquals(startBlockCount, cache.getBlockCount());
    assertEquals(startBlockHits, cache.getStats().getHitCount());
    assertEquals(startBlockMiss, cache.getStats().getMissCount());
    // flush the data
    System.out.println("Flushing cache");
    region.flushcache();
    // expect one more block in cache, no change in hits/misses
    long expectedBlockCount = startBlockCount + 1;
    long expectedBlockHits = startBlockHits;
    long expectedBlockMiss = startBlockMiss;
    assertEquals(expectedBlockCount, cache.getBlockCount());

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    assertEquals(expectedBlockCount, cache.getBlockCount());
    assertEquals(++expectedBlockHits, cache.getStats().getHitCount());
    assertEquals(expectedBlockMiss, cache.getStats().getMissCount());
    // flush, one new block
    System.out.println("Flushing cache");
    region.flushcache();
    assertEquals(++expectedBlockCount, cache.getBlockCount());
    assertEquals(expectedBlockHits, cache.getStats().getHitCount());
    assertEquals(expectedBlockMiss, cache.getStats().getMissCount());
    // compact, net minus two blocks, two hits, no misses
    System.out.println("Compacting");

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                Bytes.toBytes(valueStr));
          }
        }
        region.put(p);
      }
      region.flushcache();
    }
    LruBlockCache blockCache =
        (LruBlockCache) new CacheConfig(conf).getBlockCache();
    blockCache.clearCache();
    assertEquals(0, blockCache.getBlockTypeCountsForTest().size());

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    assertEquals(startBlockCount, cache.getBlockCount());
    assertEquals(startBlockHits, cache.getStats().getHitCount());
    assertEquals(startBlockMiss, cache.getStats().getMissCount());
    // flush the data
    System.out.println("Flushing cache");
    region.flushcache();
    // expect one more block in cache, no change in hits/misses
    long expectedBlockCount = startBlockCount + 1;
    long expectedBlockHits = startBlockHits;
    long expectedBlockMiss = startBlockMiss;
    assertEquals(expectedBlockCount, cache.getBlockCount());

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