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Example 1 with WAITING

use of org.apache.hadoop.hive.metastore.api.LockState.WAITING in project presto by prestodb.

the class ThriftHiveMetastore method lock.

@Override
public long lock(MetastoreContext metastoreContext, String databaseName, String tableName) {
    try {
        final LockComponent lockComponent = new LockComponent(EXCLUSIVE, LockLevel.TABLE, databaseName);
        lockComponent.setTablename(tableName);
        final LockRequest lockRequest = new LockRequest(Lists.newArrayList(lockComponent), metastoreContext.getUsername(), InetAddress.getLocalHost().getHostName());
        LockResponse lockResponse = stats.getLock().wrap(() -> getMetastoreClientThenCall(metastoreContext, client -> client.lock(lockRequest))).call();
        LockState state = lockResponse.getState();
        long lockId = lockResponse.getLockid();
        final AtomicBoolean acquired = new AtomicBoolean(state.equals(ACQUIRED));
        try {
            if (state.equals(WAITING)) {
                retry().maxAttempts(Integer.MAX_VALUE - 100).stopOnIllegalExceptions().exceptionMapper(e -> {
                    if (e instanceof WaitingForLockException) {
                        // only retry on waiting for lock exception
                        return e;
                    } else {
                        return new IllegalStateException(e.getMessage(), e);
                    }
                }).run("lock", stats.getLock().wrap(() -> getMetastoreClientThenCall(metastoreContext, client -> {
                    LockResponse response = client.checkLock(new CheckLockRequest(lockId));
                    LockState newState = response.getState();
                    if (newState.equals(WAITING)) {
                        throw new WaitingForLockException("Waiting for lock.");
                    } else if (newState.equals(ACQUIRED)) {
                        acquired.set(true);
                    } else {
                        throw new RuntimeException(String.format("Failed to acquire lock: %s", newState.name()));
                    }
                    return null;
                })));
            }
        } finally {
            if (!acquired.get()) {
                unlock(metastoreContext, lockId);
            }
        }
        if (!acquired.get()) {
            throw new RuntimeException("Failed to acquire lock");
        }
        return lockId;
    } catch (TException e) {
        throw new PrestoException(HIVE_METASTORE_ERROR, e);
    } catch (Exception e) {
        throw propagate(e);
    }
}
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