Examples with RowLock org.apache.accumulo.tserver.RowLocks.RowLock used on opensource projects

Example 1 with RowLock

use of org.apache.accumulo.tserver.RowLocks.RowLock in project accumulo by apache.

the class ThriftClientHandler method conditionalUpdate.

private Map<KeyExtent, List<ServerConditionalMutation>> conditionalUpdate(ConditionalSession cs, Map<KeyExtent, List<ServerConditionalMutation>> updates, ArrayList<TCMResult> results, List<String> symbols) throws IOException {
    // sort each list of mutations, this is done to avoid deadlock and doing seeks in order is
    // more efficient and detect duplicate rows.
    ConditionalMutationSet.sortConditionalMutations(updates);
    Map<KeyExtent, List<ServerConditionalMutation>> deferred = new HashMap<>();
    // can not process two mutations for the same row, because one will not see what the other
    // writes
    ConditionalMutationSet.deferDuplicatesRows(updates, deferred);
    // get as many locks as possible w/o blocking... defer any rows that are locked
    List<RowLock> locks = rowLocks.acquireRowlocks(updates, deferred);
    try {
        Span span = TraceUtil.startSpan(this.getClass(), "conditionalUpdate::Check conditions");
        try (Scope scope = span.makeCurrent()) {
            checkConditions(updates, results, cs, symbols);
        } catch (Exception e) {
            TraceUtil.setException(span, e, true);
            throw e;
        } finally {
            span.end();
        }
        Span span2 = TraceUtil.startSpan(this.getClass(), "conditionalUpdate::apply conditional mutations");
        try (Scope scope = span2.makeCurrent()) {
            writeConditionalMutations(updates, results, cs);
        } catch (Exception e) {
            TraceUtil.setException(span2, e, true);
            throw e;
        } finally {
            span2.end();
        }
    } finally {
        rowLocks.releaseRowLocks(locks);
    }
    return deferred;
}