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.

    HRegion region = initHRegion(tableName, getName(), hc,
      new Class<?>[]{}, families);


    for (int i = 0; i < 3; i++) {
      addContent(region, fam3);
      region.flushcache();
    }


    region.compactStores();


    byte [] splitRow = region.checkSplit();

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    Configuration hc = initSplit();
    HRegion region = initHRegion(tableName, getName(), hc,
      new Class<?>[]{CoprocessorImpl.class}, families);
    for (int i = 0; i < 3; i++) {
      addContent(region, fam3);
      region.flushcache();
    }


    region.compactStores();


    byte [] splitRow = region.checkSplit();

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    // put a row and flush it to disk
    Put put = new Put(ROW);
    put.add(A, A, A);
    region.put(put);
    region.flushcache();
    Get get = new Get(ROW);
    Result r = region.get(get);
    assertNull(
      "Got an unexpected number of rows - no data should be returned with the NoDataFromScan coprocessor. Found: "
          + r, r.list());

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          put.add(FAMILY_BYTES, Bytes.toBytes("col" + iCol),
              ts + version, Bytes.toBytes("value" + iFile + "_" + iRow + "_" + iCol));
        }
        region.put(put);
      }
      region.flushcache();
      version++;
    }


    Scan scan = new Scan();
    scan.setMaxVersions(Integer.MAX_VALUE);

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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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    Result result = region.get(g);
    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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      put.setWriteToWAL(false);
      put.add(COLUMN_NAME, null,  VALUE);
      region.put(put);
      if (i % 10000 == 0) {
        LOG.info("Flushing write #" + i);
        region.flushcache();
      }
    }
    HRegion.closeHRegion(region);
    return region;
  }

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