|
| 1 | +import logging |
| 2 | +import time |
| 3 | +import pytest |
| 4 | +import re |
| 5 | + |
| 6 | +from cassandra import InvalidRequest |
| 7 | + |
| 8 | +from dtest import Tester, create_ks |
| 9 | +from tools.assertions import assert_one |
| 10 | + |
| 11 | +since = pytest.mark.since |
| 12 | +logger = logging.getLogger(__name__) |
| 13 | + |
| 14 | +class BaseGuardrailsTester(Tester): |
| 15 | + |
| 16 | + def prepare(self, rf=1, options=None, nodes=3, install_byteman=False, extra_jvm_args=None, **kwargs): |
| 17 | + if options is None: |
| 18 | + options = {} |
| 19 | + |
| 20 | + if extra_jvm_args is None: |
| 21 | + extra_jvm_args = [] |
| 22 | + |
| 23 | + cluster = self.cluster |
| 24 | + cluster.set_log_level('TRACE') |
| 25 | + cluster.populate(nodes, install_byteman=install_byteman) |
| 26 | + if options: |
| 27 | + cluster.set_configuration_options(values=options) |
| 28 | + |
| 29 | + cluster.start(jvm_args=extra_jvm_args) |
| 30 | + node1 = cluster.nodelist()[0] |
| 31 | + |
| 32 | + session = self.patient_cql_connection(node1, **kwargs) |
| 33 | + create_ks(session, 'ks', rf) |
| 34 | + |
| 35 | + return session |
| 36 | + |
| 37 | + |
| 38 | +@since('4.0') |
| 39 | +class TestGuardrails(BaseGuardrailsTester): |
| 40 | + |
| 41 | + def test_disk_usage_guardrail(self): |
| 42 | + """ |
| 43 | + Test disk usage guardrail will warn if exceeds warn threshold and reject writes if exceeds failure threshold |
| 44 | + """ |
| 45 | + |
| 46 | + self.fixture_dtest_setup.ignore_log_patterns = ["Write request failed because disk usage exceeds failure threshold"] |
| 47 | + guardrails_config = {'guardrails': {'disk_usage_percentage_warn_threshold': 98, |
| 48 | + 'disk_usage_percentage_failure_threshold': 99}} |
| 49 | + |
| 50 | + logger.debug("prepare 2-node cluster with rf=1 and guardrails enabled") |
| 51 | + session = self.prepare(rf=1, nodes=2, options=guardrails_config, extra_jvm_args=['-Dcassandra.disk_usage.monitor_interval_ms=100'], install_byteman=True) |
| 52 | + node1, node2 = self.cluster.nodelist() |
| 53 | + session.execute("CREATE TABLE t (id int PRIMARY KEY, v int)") |
| 54 | + |
| 55 | + logger.debug("Inject FULL to node1, expect log on node1 and node2 rejects writes") |
| 56 | + mark = node1.mark_log() |
| 57 | + self.disk_usage_injection(node1, "full", False) |
| 58 | + node1.watch_log_for("Adding state DISK_USAGE: FULL", filename='debug.log', from_mark=mark, timeout=10) |
| 59 | + |
| 60 | + # verify node2 will reject writes if node1 is the replica |
| 61 | + session2 = self.patient_exclusive_cql_connection(node2, keyspace="ks") |
| 62 | + rows = 100 |
| 63 | + failed = 0 |
| 64 | + for x in range(rows): |
| 65 | + try: |
| 66 | + session2.execute("INSERT INTO t(id, v) VALUES({v}, {v})".format(v=x)) |
| 67 | + except InvalidRequest as e: |
| 68 | + assert re.search("Write request failed because disk usage exceeds failure threshold", str(e)) |
| 69 | + failed = failed + 1 |
| 70 | + |
| 71 | + assert rows != failed, "Expect node2 rejects some writes, but rejected all" |
| 72 | + assert 0 != failed, "Expect node2 rejects some writes, but rejected nothing" |
| 73 | + assert_one(session2, "SELECT COUNT(*) FROM t", [rows - failed]) |
| 74 | + |
| 75 | + logger.debug("Inject STUFFED to node1, node2 should warn client") |
| 76 | + session2.execute("TRUNCATE t") |
| 77 | + mark = node1.mark_log() |
| 78 | + self.disk_usage_injection(node1, "stuffed") |
| 79 | + node1.watch_log_for("Adding state DISK_USAGE: STUFFED", filename='debug.log', from_mark=mark, timeout=10) |
| 80 | + |
| 81 | + warnings = 0 |
| 82 | + for x in range(rows): |
| 83 | + fut = session2.execute_async("INSERT INTO t(id, v) VALUES({v}, {v})".format(v=x)) |
| 84 | + fut.result() |
| 85 | + if fut.warnings: |
| 86 | + assert ["Replica disk usage exceeds warn threshold"] == fut.warnings |
| 87 | + warnings = warnings + 1 |
| 88 | + |
| 89 | + assert rows != warnings,"Expect node2 emits some warnings, but got all warnings" |
| 90 | + assert 0 != warnings,"Expect node2 emits some warnings, but got no warnings" |
| 91 | + assert_one(session2, "SELECT COUNT(*) FROM t", [rows]) |
| 92 | + |
| 93 | + session.cluster.shutdown() |
| 94 | + session2.cluster.shutdown() |
| 95 | + |
| 96 | + def disk_usage_injection(self, node, state, clear_byteman=True): |
| 97 | + if clear_byteman: |
| 98 | + node.byteman_submit(['-u']) |
| 99 | + node.byteman_submit(["./byteman/guardrails/disk_usage_{}.btm".format(state)]) |
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