Examples with SnapshotExistsException org.apache.hadoop.hbase.snapshot.SnapshotExistsException used on opensource projects

Example 1 with SnapshotExistsException

use of org.apache.hadoop.hbase.snapshot.SnapshotExistsException in project hbase by apache.

the class SnapshotManager method takeSnapshot.

/**
   * Take a snapshot based on the enabled/disabled state of the table.
   *
   * @param snapshot
   * @throws HBaseSnapshotException when a snapshot specific exception occurs.
   * @throws IOException when some sort of generic IO exception occurs.
   */
public void takeSnapshot(SnapshotDescription snapshot) throws IOException {
    // check to see if we already completed the snapshot
    if (isSnapshotCompleted(snapshot)) {
        throw new SnapshotExistsException("Snapshot '" + snapshot.getName() + "' already stored on the filesystem.", ProtobufUtil.createSnapshotDesc(snapshot));
    }
    LOG.debug("No existing snapshot, attempting snapshot...");
    // stop tracking "abandoned" handlers
    cleanupSentinels();
    // check to see if the table exists
    HTableDescriptor desc = null;
    try {
        desc = master.getTableDescriptors().get(TableName.valueOf(snapshot.getTable()));
    } catch (FileNotFoundException e) {
        String msg = "Table:" + snapshot.getTable() + " info doesn't exist!";
        LOG.error(msg);
        throw new SnapshotCreationException(msg, e, ProtobufUtil.createSnapshotDesc(snapshot));
    } catch (IOException e) {
        throw new SnapshotCreationException("Error while geting table description for table " + snapshot.getTable(), e, ProtobufUtil.createSnapshotDesc(snapshot));
    }
    if (desc == null) {
        throw new SnapshotCreationException("Table '" + snapshot.getTable() + "' doesn't exist, can't take snapshot.", ProtobufUtil.createSnapshotDesc(snapshot));
    }
    SnapshotDescription.Builder builder = snapshot.toBuilder();
    // if not specified, set the snapshot format
    if (!snapshot.hasVersion()) {
        builder.setVersion(SnapshotDescriptionUtils.SNAPSHOT_LAYOUT_VERSION);
    }
    User user = RpcServer.getRequestUser();
    if (User.isHBaseSecurityEnabled(master.getConfiguration()) && user != null) {
        builder.setOwner(user.getShortName());
    }
    snapshot = builder.build();
    // call pre coproc hook
    MasterCoprocessorHost cpHost = master.getMasterCoprocessorHost();
    if (cpHost != null) {
        cpHost.preSnapshot(snapshot, desc);
    }
    // if the table is enabled, then have the RS run actually the snapshot work
    TableName snapshotTable = TableName.valueOf(snapshot.getTable());
    if (master.getTableStateManager().isTableState(snapshotTable, TableState.State.ENABLED)) {
        LOG.debug("Table enabled, starting distributed snapshot.");
        snapshotEnabledTable(snapshot);
        LOG.debug("Started snapshot: " + ClientSnapshotDescriptionUtils.toString(snapshot));
    } else // For disabled table, snapshot is created by the master
    if (master.getTableStateManager().isTableState(snapshotTable, TableState.State.DISABLED)) {
        LOG.debug("Table is disabled, running snapshot entirely on master.");
        snapshotDisabledTable(snapshot);
        LOG.debug("Started snapshot: " + ClientSnapshotDescriptionUtils.toString(snapshot));
    } else {
        LOG.error("Can't snapshot table '" + snapshot.getTable() + "', isn't open or closed, we don't know what to do!");
        TablePartiallyOpenException tpoe = new TablePartiallyOpenException(snapshot.getTable() + " isn't fully open.");
        throw new SnapshotCreationException("Table is not entirely open or closed", tpoe, ProtobufUtil.createSnapshotDesc(snapshot));
    }
    // call post coproc hook
    if (cpHost != null) {
        cpHost.postSnapshot(snapshot, desc);
    }
}