Examples with NoServerForRegionException org.apache.hadoop.hbase.client.NoServerForRegionException used on opensource projects

Example 1 with NoServerForRegionException

use of org.apache.hadoop.hbase.client.NoServerForRegionException in project hbase by apache.

the class RegionSplitter method splitScan.

static LinkedList<Pair<byte[], byte[]>> splitScan(LinkedList<Pair<byte[], byte[]>> regionList, final Connection connection, final TableName tableName, SplitAlgorithm splitAlgo) throws IOException, InterruptedException {
    LinkedList<Pair<byte[], byte[]>> finished = Lists.newLinkedList();
    LinkedList<Pair<byte[], byte[]>> logicalSplitting = Lists.newLinkedList();
    LinkedList<Pair<byte[], byte[]>> physicalSplitting = Lists.newLinkedList();
    // Get table info
    Pair<Path, Path> tableDirAndSplitFile = getTableDirAndSplitFile(connection.getConfiguration(), tableName);
    Path tableDir = tableDirAndSplitFile.getFirst();
    FileSystem fs = tableDir.getFileSystem(connection.getConfiguration());
    // Clear the cache to forcibly refresh region information
    ((ClusterConnection) connection).clearRegionCache();
    HTableDescriptor htd = null;
    try (Table table = connection.getTable(tableName)) {
        htd = table.getTableDescriptor();
    }
    try (RegionLocator regionLocator = connection.getRegionLocator(tableName)) {
        // for every region that hasn't been verified as a finished split
        for (Pair<byte[], byte[]> region : regionList) {
            byte[] start = region.getFirst();
            byte[] split = region.getSecond();
            // see if the new split daughter region has come online
            try {
                HRegionInfo dri = regionLocator.getRegionLocation(split).getRegionInfo();
                if (dri.isOffline() || !Bytes.equals(dri.getStartKey(), split)) {
                    logicalSplitting.add(region);
                    continue;
                }
            } catch (NoServerForRegionException nsfre) {
                // NSFRE will occur if the old hbase:meta entry has no server assigned
                LOG.info(nsfre);
                logicalSplitting.add(region);
                continue;
            }
            try {
                // when a daughter region is opened, a compaction is triggered
                // wait until compaction completes for both daughter regions
                LinkedList<HRegionInfo> check = Lists.newLinkedList();
                check.add(regionLocator.getRegionLocation(start).getRegionInfo());
                check.add(regionLocator.getRegionLocation(split).getRegionInfo());
                for (HRegionInfo hri : check.toArray(new HRegionInfo[check.size()])) {
                    byte[] sk = hri.getStartKey();
                    if (sk.length == 0)
                        sk = splitAlgo.firstRow();
                    HRegionFileSystem regionFs = HRegionFileSystem.openRegionFromFileSystem(connection.getConfiguration(), fs, tableDir, hri, true);
                    // Check every Column Family for that region -- check does not have references.
                    boolean refFound = false;
                    for (HColumnDescriptor c : htd.getFamilies()) {
                        if ((refFound = regionFs.hasReferences(c.getNameAsString()))) {
                            break;
                        }
                    }
                    // compaction is completed when all reference files are gone
                    if (!refFound) {
                        check.remove(hri);
                    }
                }
                if (check.isEmpty()) {
                    finished.add(region);
                } else {
                    physicalSplitting.add(region);
                }
            } catch (NoServerForRegionException nsfre) {
                LOG.debug("No Server Exception thrown for: " + splitAlgo.rowToStr(start));
                physicalSplitting.add(region);
                ((ClusterConnection) connection).clearRegionCache();
            }
        }
        LOG.debug("Split Scan: " + finished.size() + " finished / " + logicalSplitting.size() + " split wait / " + physicalSplitting.size() + " reference wait");
        return finished;
    }
}