Examples with Visitor org.apache.hadoop.hbase.MetaTableAccessor.Visitor used on opensource projects

Example 1 with Visitor

use of org.apache.hadoop.hbase.MetaTableAccessor.Visitor in project hbase by apache.

the class TestMasterOperationsForRegionReplicas method validateNumberOfRowsInMeta.

private void validateNumberOfRowsInMeta(final TableName table, int numRegions, Connection connection) throws IOException {
    assert (ADMIN.tableExists(table));
    final AtomicInteger count = new AtomicInteger();
    Visitor visitor = new Visitor() {

        @Override
        public boolean visit(Result r) throws IOException {
            if (MetaTableAccessor.getHRegionInfo(r).getTable().equals(table))
                count.incrementAndGet();
            return true;
        }
    };
    MetaTableAccessor.fullScanRegions(connection, visitor);
    assert (count.get() == numRegions);
}

Example 2 with Visitor

use of org.apache.hadoop.hbase.MetaTableAccessor.Visitor in project hbase by apache.

the class SnapshotOfRegionAssignmentFromMeta method initialize.

/**
   * Initialize the region assignment snapshot by scanning the hbase:meta table
   * @throws IOException
   */
public void initialize() throws IOException {
    LOG.info("Start to scan the hbase:meta for the current region assignment " + "snappshot");
    // TODO: at some point this code could live in the MetaTableAccessor
    Visitor v = new Visitor() {

        @Override
        public boolean visit(Result result) throws IOException {
            try {
                if (result == null || result.isEmpty())
                    return true;
                RegionLocations rl = MetaTableAccessor.getRegionLocations(result);
                if (rl == null)
                    return true;
                HRegionInfo hri = rl.getRegionLocation(0).getRegionInfo();
                if (hri == null)
                    return true;
                if (hri.getTable() == null)
                    return true;
                if (disabledTables.contains(hri.getTable())) {
                    return true;
                }
                // Are we to include split parents in the list?
                if (excludeOfflinedSplitParents && hri.isSplit())
                    return true;
                HRegionLocation[] hrls = rl.getRegionLocations();
                // Add the current assignment to the snapshot for all replicas
                for (int i = 0; i < hrls.length; i++) {
                    if (hrls[i] == null)
                        continue;
                    hri = hrls[i].getRegionInfo();
                    if (hri == null)
                        continue;
                    addAssignment(hri, hrls[i].getServerName());
                    addRegion(hri);
                }
                hri = rl.getRegionLocation(0).getRegionInfo();
                // the code below is to handle favored nodes
                byte[] favoredNodes = result.getValue(HConstants.CATALOG_FAMILY, FavoredNodeAssignmentHelper.FAVOREDNODES_QUALIFIER);
                if (favoredNodes == null)
                    return true;
                // Add the favored nodes into assignment plan
                ServerName[] favoredServerList = FavoredNodeAssignmentHelper.getFavoredNodesList(favoredNodes);
                // Add the favored nodes into assignment plan
                existingAssignmentPlan.updateFavoredNodesMap(hri, Arrays.asList(favoredServerList));
                /*
           * Typically there should be FAVORED_NODES_NUM favored nodes for a region in meta. If
           * there is less than FAVORED_NODES_NUM, lets use as much as we can but log a warning.
           */
                if (favoredServerList.length != FavoredNodeAssignmentHelper.FAVORED_NODES_NUM) {
                    LOG.warn("Insufficient favored nodes for region " + hri + " fn: " + Arrays.toString(favoredServerList));
                }
                for (int i = 0; i < favoredServerList.length; i++) {
                    if (i == PRIMARY.ordinal())
                        addPrimaryAssignment(hri, favoredServerList[i]);
                    if (i == SECONDARY.ordinal())
                        addSecondaryAssignment(hri, favoredServerList[i]);
                    if (i == TERTIARY.ordinal())
                        addTeritiaryAssignment(hri, favoredServerList[i]);
                }
                return true;
            } catch (RuntimeException e) {
                LOG.error("Catche remote exception " + e.getMessage() + " when processing" + result);
                throw e;
            }
        }
    };
    // Scan hbase:meta to pick up user regions
    MetaTableAccessor.fullScanRegions(connection, v);
    //regionToRegionServerMap = regions;
    LOG.info("Finished to scan the hbase:meta for the current region assignment" + "snapshot");
}