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Posted to commits@mesos.apache.org by zh...@apache.org on 2018/06/12 21:06:05 UTC
[1/3] mesos git commit: Unmounted any mount points in gc paths.
Repository: mesos
Updated Branches:
refs/heads/master 8d2cebe5e -> d733b1031
Unmounted any mount points in gc paths.
In various corner cases, agent may not get chance to properly unmount
persistent volumes mounted inside an executor's sandbox. When GC later
gets to these sandbox directories, permanent data loss can happen (see
MESOS-8830).
Currently, the only mounts in the host mount namespace under the sandbox
directories are persistent volumes, so this diff added protection to
unmount any dangling mount points before calling `rmdir` on the
directory.
NOTE: this means agent will not garbage collect any path if it cannot
read its own `mountinfo` table.
Review: https://reviews.apache.org/r/67264
Project: http://git-wip-us.apache.org/repos/asf/mesos/repo
Commit: http://git-wip-us.apache.org/repos/asf/mesos/commit/db2d1c2c
Tree: http://git-wip-us.apache.org/repos/asf/mesos/tree/db2d1c2c
Diff: http://git-wip-us.apache.org/repos/asf/mesos/diff/db2d1c2c
Branch: refs/heads/master
Commit: db2d1c2c41a07cc7c47afcf86d509d96ea2c04d3
Parents: 8d2cebe
Author: Zhitao Li <zh...@gmail.com>
Authored: Tue May 22 10:55:50 2018 -0700
Committer: Zhitao Li <zh...@gmail.com>
Committed: Tue Jun 12 13:17:54 2018 -0700
----------------------------------------------------------------------
src/local/local.cpp | 2 +-
src/slave/gc.cpp | 74 ++++++++++++++++++++++++++++++++++++++----
src/slave/gc.hpp | 2 +-
src/slave/gc_process.hpp | 7 ++--
src/slave/main.cpp | 2 +-
src/tests/cluster.cpp | 2 +-
src/tests/gc_tests.cpp | 6 ++--
src/tests/mesos.cpp | 3 +-
src/tests/mesos.hpp | 2 +-
src/tests/slave_tests.cpp | 6 ++--
10 files changed, 85 insertions(+), 21 deletions(-)
----------------------------------------------------------------------
http://git-wip-us.apache.org/repos/asf/mesos/blob/db2d1c2c/src/local/local.cpp
----------------------------------------------------------------------
diff --git a/src/local/local.cpp b/src/local/local.cpp
index afff546..5b7bb59 100644
--- a/src/local/local.cpp
+++ b/src/local/local.cpp
@@ -427,7 +427,7 @@ PID<Master> launch(const Flags& flags, Allocator* _allocator)
<< slaveFlags.runtime_dir << "': " << mkdir.error();
}
- garbageCollectors->push_back(new GarbageCollector());
+ garbageCollectors->push_back(new GarbageCollector(slaveFlags.work_dir));
taskStatusUpdateManagers->push_back(
new TaskStatusUpdateManager(slaveFlags));
fetchers->push_back(new Fetcher(slaveFlags));
http://git-wip-us.apache.org/repos/asf/mesos/blob/db2d1c2c/src/slave/gc.cpp
----------------------------------------------------------------------
diff --git a/src/slave/gc.cpp b/src/slave/gc.cpp
index 390b35e..8770d88 100644
--- a/src/slave/gc.cpp
+++ b/src/slave/gc.cpp
@@ -25,6 +25,7 @@
#include <process/metrics/metrics.hpp>
+#include <stout/adaptor.hpp>
#include <stout/foreach.hpp>
#include <stout/lambda.hpp>
@@ -32,6 +33,10 @@
#include "logging/logging.hpp"
+#ifdef __linux__
+#include "linux/fs.hpp"
+#endif
+
#include "slave/gc_process.hpp"
using namespace process;
@@ -193,12 +198,69 @@ void GarbageCollectorProcess::remove(const Timeout& removalTime)
Counter _succeeded = metrics.path_removals_succeeded;
Counter _failed = metrics.path_removals_failed;
+ const string _workDir = workDir;
- auto rmdirs = [_succeeded, _failed, infos]() {
+ auto rmdirs =
+ [_succeeded, _failed, _workDir, infos]() mutable -> Future<Nothing> {
// Make mutable copies of the counters to work around MESOS-7907.
Counter succeeded = _succeeded;
Counter failed = _failed;
+#ifdef __linux__
+ // Clear any possible persistent volume mount points in `infos`. See
+ // MESOS-8830.
+ Try<fs::MountInfoTable> mountTable = fs::MountInfoTable::read();
+ if (mountTable.isError()) {
+ LOG(ERROR) << "Skipping any path deletion because of failure on read "
+ "MountInfoTable for agent process: "
+ << mountTable.error();
+
+ foreach (const Owned<PathInfo>& info, infos) {
+ info->promise.fail(mountTable.error());
+ ++failed;
+ }
+
+ return Failure(mountTable.error());
+ }
+
+ foreach (const fs::MountInfoTable::Entry& entry,
+ adaptor::reverse(mountTable->entries)) {
+ // Ignore mounts whose targets are not under `workDir`.
+ if (!strings::startsWith(
+ path::join(entry.target, ""),
+ path::join(_workDir, ""))) {
+ continue;
+ }
+
+ for (auto it = infos.begin(); it != infos.end(); ) {
+ const Owned<PathInfo>& info = *it;
+ // TODO(zhitao): Validate that both `info->path` and `workDir` are
+ // real paths.
+ if (strings::startsWith(
+ path::join(entry.target, ""), path::join(info->path, ""))) {
+ LOG(WARNING)
+ << "Unmounting dangling mount point '" << entry.target
+ << "' of persistent volume '" << entry.root
+ << "' inside garbage collected path '" << info->path << "'";
+
+ Try<Nothing> unmount = fs::unmount(entry.target);
+ if (unmount.isError()) {
+ LOG(WARNING) << "Skipping deletion of '"
+ << info->path << "' because unmount failed on '"
+ << entry.target << "': " << unmount.error();
+
+ info->promise.fail(unmount.error());
+ ++failed;
+ it = infos.erase(it);
+ continue;
+ }
+ }
+
+ it++;
+ }
+ }
+#endif // __linux__
+
foreach (const Owned<PathInfo>& info, infos) {
// Run the removal operation with 'continueOnError = true'.
// It's possible for tasks and isolators to lay down files
@@ -241,11 +303,9 @@ void GarbageCollectorProcess::remove(const Timeout& removalTime)
}
-void GarbageCollectorProcess::_remove(const Future<Nothing>& result,
- const list<Owned<PathInfo>> infos)
+void GarbageCollectorProcess::_remove(const Future<Nothing>& result,
+ const list<Owned<PathInfo>> infos)
{
- CHECK_READY(result);
-
// Remove path records from `paths` and `timeouts` data structures.
foreach (const Owned<PathInfo>& info, infos) {
CHECK(paths.remove(timeouts[info->path], info));
@@ -268,9 +328,9 @@ void GarbageCollectorProcess::prune(const Duration& d)
}
-GarbageCollector::GarbageCollector()
+GarbageCollector::GarbageCollector(const string& workDir)
{
- process = new GarbageCollectorProcess();
+ process = new GarbageCollectorProcess(workDir);
spawn(process);
}
http://git-wip-us.apache.org/repos/asf/mesos/blob/db2d1c2c/src/slave/gc.hpp
----------------------------------------------------------------------
diff --git a/src/slave/gc.hpp b/src/slave/gc.hpp
index df40165..0275c73 100644
--- a/src/slave/gc.hpp
+++ b/src/slave/gc.hpp
@@ -42,7 +42,7 @@ class GarbageCollectorProcess;
class GarbageCollector
{
public:
- GarbageCollector();
+ explicit GarbageCollector(const std::string& workDir);
virtual ~GarbageCollector();
// Schedules the specified path for removal after the specified
http://git-wip-us.apache.org/repos/asf/mesos/blob/db2d1c2c/src/slave/gc_process.hpp
----------------------------------------------------------------------
diff --git a/src/slave/gc_process.hpp b/src/slave/gc_process.hpp
index 20374ad..84c83d3 100644
--- a/src/slave/gc_process.hpp
+++ b/src/slave/gc_process.hpp
@@ -45,9 +45,10 @@ class GarbageCollectorProcess :
public process::Process<GarbageCollectorProcess>
{
public:
- GarbageCollectorProcess()
+ explicit GarbageCollectorProcess(const std::string& _workDir)
: ProcessBase(process::ID::generate("agent-garbage-collector")),
- metrics(this) {}
+ metrics(this),
+ workDir(_workDir) {}
virtual ~GarbageCollectorProcess();
@@ -97,6 +98,8 @@ private:
process::metrics::PullGauge path_removals_pending;
} metrics;
+ const std::string workDir;
+
// Store all the timeouts and corresponding paths to delete.
// NOTE: We are using Multimap here instead of Multihashmap, because
// we need the keys of the map (deletion time) to be sorted.
http://git-wip-us.apache.org/repos/asf/mesos/blob/db2d1c2c/src/slave/main.cpp
----------------------------------------------------------------------
diff --git a/src/slave/main.cpp b/src/slave/main.cpp
index 6461253..489e875 100644
--- a/src/slave/main.cpp
+++ b/src/slave/main.cpp
@@ -539,7 +539,7 @@ int main(int argc, char** argv)
}
Files* files = new Files(READONLY_HTTP_AUTHENTICATION_REALM, authorizer_);
- GarbageCollector* gc = new GarbageCollector();
+ GarbageCollector* gc = new GarbageCollector(flags.work_dir);
TaskStatusUpdateManager* taskStatusUpdateManager =
new TaskStatusUpdateManager(flags);
http://git-wip-us.apache.org/repos/asf/mesos/blob/db2d1c2c/src/tests/cluster.cpp
----------------------------------------------------------------------
diff --git a/src/tests/cluster.cpp b/src/tests/cluster.cpp
index 01eb095..cb7d3f0 100644
--- a/src/tests/cluster.cpp
+++ b/src/tests/cluster.cpp
@@ -505,7 +505,7 @@ Try<process::Owned<Slave>> Slave::create(
// If the garbage collector is not provided, create a default one.
if (gc.isNone()) {
- slave->gc.reset(new slave::GarbageCollector());
+ slave->gc.reset(new slave::GarbageCollector(flags.work_dir));
}
// If the resource estimator is not provided, create a default one.
http://git-wip-us.apache.org/repos/asf/mesos/blob/db2d1c2c/src/tests/gc_tests.cpp
----------------------------------------------------------------------
diff --git a/src/tests/gc_tests.cpp b/src/tests/gc_tests.cpp
index 619ed22..ed0fef3 100644
--- a/src/tests/gc_tests.cpp
+++ b/src/tests/gc_tests.cpp
@@ -96,7 +96,7 @@ class GarbageCollectorTest : public TemporaryDirectoryTest {};
TEST_F(GarbageCollectorTest, Schedule)
{
- GarbageCollector gc;
+ GarbageCollector gc("work_dir");
// Make some temporary files to gc.
const string& file1 = "file1";
@@ -180,7 +180,7 @@ TEST_F(GarbageCollectorTest, Schedule)
TEST_F(GarbageCollectorTest, Unschedule)
{
- GarbageCollector gc;
+ GarbageCollector gc("work_dir");
// Attempt to unschedule a file that is not scheduled.
AWAIT_ASSERT_FALSE(gc.unschedule("bogus"));
@@ -229,7 +229,7 @@ TEST_F(GarbageCollectorTest, Unschedule)
TEST_F(GarbageCollectorTest, Prune)
{
- GarbageCollector gc;
+ GarbageCollector gc("work_dir");
// Make some temporary files to prune.
const string& file1 = "file1";
http://git-wip-us.apache.org/repos/asf/mesos/blob/db2d1c2c/src/tests/mesos.cpp
----------------------------------------------------------------------
diff --git a/src/tests/mesos.cpp b/src/tests/mesos.cpp
index d3c87c2..c0ab2f7 100644
--- a/src/tests/mesos.cpp
+++ b/src/tests/mesos.cpp
@@ -691,7 +691,8 @@ MockAuthorizer::MockAuthorizer()
MockAuthorizer::~MockAuthorizer() {}
-MockGarbageCollector::MockGarbageCollector()
+MockGarbageCollector::MockGarbageCollector(const string& workDir)
+ : slave::GarbageCollector(workDir)
{
EXPECT_CALL(*this, unschedule(_)).WillRepeatedly(Return(true));
}
http://git-wip-us.apache.org/repos/asf/mesos/blob/db2d1c2c/src/tests/mesos.hpp
----------------------------------------------------------------------
diff --git a/src/tests/mesos.hpp b/src/tests/mesos.hpp
index 733344a..8f529fa 100644
--- a/src/tests/mesos.hpp
+++ b/src/tests/mesos.hpp
@@ -3353,7 +3353,7 @@ public:
class MockGarbageCollector : public slave::GarbageCollector
{
public:
- MockGarbageCollector();
+ explicit MockGarbageCollector(const std::string& workDir);
virtual ~MockGarbageCollector();
// The default action is to always return `true`.
http://git-wip-us.apache.org/repos/asf/mesos/blob/db2d1c2c/src/tests/slave_tests.cpp
----------------------------------------------------------------------
diff --git a/src/tests/slave_tests.cpp b/src/tests/slave_tests.cpp
index 3d67511..b46fb8e 100644
--- a/src/tests/slave_tests.cpp
+++ b/src/tests/slave_tests.cpp
@@ -4709,10 +4709,10 @@ TEST_F(SlaveTest, RemoveExecutorUponFailedTaskGroupLaunch)
Owned<MasterDetector> detector = master.get()->createDetector();
- MockGarbageCollector mockGarbageCollector;
-
slave::Flags slaveFlags = CreateSlaveFlags();
+ MockGarbageCollector mockGarbageCollector(slaveFlags.work_dir);
+
// Start a mock slave.
Try<Owned<cluster::Slave>> slave =
StartSlave(detector.get(), &mockGarbageCollector, slaveFlags, true);
@@ -4867,8 +4867,8 @@ TEST_F(SlaveTest, LaunchTasksReorderUnscheduleGC)
ASSERT_SOME(master);
Owned<MasterDetector> detector = master.get()->createDetector();
- MockGarbageCollector mockGarbageCollector;
slave::Flags slaveFlags = CreateSlaveFlags();
+ MockGarbageCollector mockGarbageCollector(slaveFlags.work_dir);
// Start a mock slave.
Try<Owned<cluster::Slave>> slave =
[3/3] mesos git commit: Rewrote the `ROOT_BusyMountPoint` test to
reflect updated behavior.
Posted by zh...@apache.org.
Rewrote the `ROOT_BusyMountPoint` test to reflect updated behavior.
The current `ROOT_BusyMountPoint` test would fail because we added
support for unmounting dangling mount points in directory to gc. This
patch rewrote this test to reflect that after unmounting, the gc
succeeded, directory was gone and metrics were correctly reported.
Review: https://reviews.apache.org/r/67421
Project: http://git-wip-us.apache.org/repos/asf/mesos/repo
Commit: http://git-wip-us.apache.org/repos/asf/mesos/commit/d733b103
Tree: http://git-wip-us.apache.org/repos/asf/mesos/tree/d733b103
Diff: http://git-wip-us.apache.org/repos/asf/mesos/diff/d733b103
Branch: refs/heads/master
Commit: d733b1031350e03bce443aa287044eb4eee1053a
Parents: 644ffc8
Author: Zhitao Li <zh...@gmail.com>
Authored: Fri Jun 1 16:58:34 2018 -0700
Committer: Zhitao Li <zh...@gmail.com>
Committed: Tue Jun 12 13:20:46 2018 -0700
----------------------------------------------------------------------
src/tests/gc_tests.cpp | 90 ++++++++++++++++++++++++++++-----------------
1 file changed, 57 insertions(+), 33 deletions(-)
----------------------------------------------------------------------
http://git-wip-us.apache.org/repos/asf/mesos/blob/d733b103/src/tests/gc_tests.cpp
----------------------------------------------------------------------
diff --git a/src/tests/gc_tests.cpp b/src/tests/gc_tests.cpp
index ed0fef3..4f288cf 100644
--- a/src/tests/gc_tests.cpp
+++ b/src/tests/gc_tests.cpp
@@ -899,25 +899,29 @@ TEST_F(GarbageCollectorIntegrationTest, Unschedule)
#ifdef __linux__
-// In Mesos it's possible for tasks and isolators to lay down files
-// that are not deletable by GC. This test runs a task that creates a busy
-// mount point which is not directly deletable by GC. We verify that
-// GC deletes all files that it's able to delete in the face of such errors.
-TEST_F(GarbageCollectorIntegrationTest, ROOT_BusyMountPoint)
+// This test creates a persistent volume and runs a task which mounts the volume
+// inside the sandbox, to simulate a dangling mount which agent failed to
+// clean up (see MESOS-8830). We verify that GC process will unmount the
+// dangling mount point successfully and report success in metrics.
+TEST_F(GarbageCollectorIntegrationTest, ROOT_DanglingMount)
{
Try<Owned<cluster::Master>> master = StartMaster();
ASSERT_SOME(master);
slave::Flags flags = CreateSlaveFlags();
+ flags.resources = strings::format("disk(%s):1024", DEFAULT_TEST_ROLE).get();
+
Owned<MasterDetector> detector = master.get()->createDetector();
Try<Owned<cluster::Slave>> slave = StartSlave(detector.get(), flags);
ASSERT_SOME(slave);
+ FrameworkInfo frameworkInfo = DEFAULT_FRAMEWORK_INFO;
+ frameworkInfo.set_roles(0, DEFAULT_TEST_ROLE);
MockScheduler sched;
MesosSchedulerDriver driver(
&sched,
- DEFAULT_FRAMEWORK_INFO,
+ frameworkInfo,
master.get()->pid,
DEFAULT_CREDENTIAL);
@@ -936,21 +940,33 @@ TEST_F(GarbageCollectorIntegrationTest, ROOT_BusyMountPoint)
AWAIT_READY(offers);
ASSERT_FALSE(offers->empty());
- const Offer& offer = offers.get()[0];
- const SlaveID& slaveId = offer.slave_id();
+ const Offer& offer = offers->at(0);
+
+ string persistenceId = "persistence-id";
+ string containerPath = "path";
+
+ Resource volume = createPersistentVolume(
+ Megabytes(1024),
+ DEFAULT_TEST_ROLE,
+ persistenceId,
+ containerPath,
+ None(),
+ None(),
+ frameworkInfo.principal());
+
+ string mountPoint = "dangling";
+
+ string hostPath = slave::paths::getPersistentVolumePath(
+ flags.work_dir, DEFAULT_TEST_ROLE, persistenceId);
- // The busy mount point goes before the regular file in GC's
- // directory traversal due to their names. This makes sure that
- // an error occurs before all deletable files are GCed.
- string mountPoint = "test1";
- string regularFile = "test2.txt";
+ string fileInVolume = "foo.txt";
TaskInfo task = createTask(
- slaveId,
- Resources::parse("cpus:1;mem:128;disk:1").get(),
- "touch "+ regularFile + "; "
+ offer.slave_id(),
+ Resources(volume),
+ "touch "+ path::join(containerPath, fileInVolume) + "; "
"mkdir " + mountPoint + "; "
- "mount --bind " + mountPoint + " " + mountPoint,
+ "mount --bind " + hostPath + " " + mountPoint,
None(),
"test-task123",
"test-task123");
@@ -966,7 +982,15 @@ TEST_F(GarbageCollectorIntegrationTest, ROOT_BusyMountPoint)
Future<Nothing> schedule = FUTURE_DISPATCH(
_, &GarbageCollectorProcess::schedule);
- driver.launchTasks(offer.id(), {task});
+ Future<Nothing> ack1 =
+ FUTURE_DISPATCH(_, &Slave::_statusUpdateAcknowledgement);
+
+ Future<Nothing> ack2 =
+ FUTURE_DISPATCH(_, &Slave::_statusUpdateAcknowledgement);
+
+ driver.acceptOffers(
+ {offer.id()},
+ {CREATE(volume), LAUNCH({task})});
AWAIT_READY(status0);
EXPECT_EQ(task.task_id(), status0->task_id());
@@ -980,23 +1004,21 @@ TEST_F(GarbageCollectorIntegrationTest, ROOT_BusyMountPoint)
executorId.set_value("test-task123");
Result<string> _sandbox = os::realpath(slave::paths::getExecutorLatestRunPath(
flags.work_dir,
- slaveId,
+ offer.slave_id(),
frameworkId.get(),
executorId));
ASSERT_SOME(_sandbox);
string sandbox = _sandbox.get();
EXPECT_TRUE(os::exists(sandbox));
- // Wait for the task to create these paths.
+ // Wait for the task to create the dangling mount point.
Timeout timeout = Timeout::in(process::TEST_AWAIT_TIMEOUT);
while (!os::exists(path::join(sandbox, mountPoint)) ||
- !os::exists(path::join(sandbox, regularFile)) ||
!timeout.expired()) {
os::sleep(Milliseconds(10));
}
ASSERT_TRUE(os::exists(path::join(sandbox, mountPoint)));
- ASSERT_TRUE(os::exists(path::join(sandbox, regularFile)));
AWAIT_READY(status2);
ASSERT_EQ(task.task_id(), status2->task_id());
@@ -1004,15 +1026,16 @@ TEST_F(GarbageCollectorIntegrationTest, ROOT_BusyMountPoint)
AWAIT_READY(schedule);
+ ASSERT_TRUE(os::exists(path::join(sandbox, mountPoint)));
+ ASSERT_TRUE(os::exists(path::join(hostPath, fileInVolume)));
+
+ AWAIT_READY(schedule);
+
Clock::pause();
Clock::advance(flags.gc_delay);
Clock::settle();
- EXPECT_TRUE(os::exists(sandbox));
- EXPECT_TRUE(os::exists(path::join(sandbox, mountPoint)));
- EXPECT_FALSE(os::exists(path::join(sandbox, regularFile)));
-
- // Verify that GC metrics show that a path removal failed.
+ // Verify that GC metrics showes no failure.
JSON::Object metrics = Metrics();
ASSERT_EQ(1u, metrics.values.count("gc/path_removals_pending"));
@@ -1022,18 +1045,19 @@ TEST_F(GarbageCollectorIntegrationTest, ROOT_BusyMountPoint)
EXPECT_SOME_EQ(
0u,
metrics.at<JSON::Number>("gc/path_removals_pending"));
+
EXPECT_SOME_EQ(
0u,
- metrics.at<JSON::Number>("gc/path_removals_succeeded"));
+ metrics.at<JSON::Number>("gc/path_removals_failed"));
- // The sandbox path removal failure will cascade to cause failures to
- // remove the executor and framework directories. For testing purposes
- // it is sufficient to verify that some failure was detected.
- ASSERT_SOME(metrics.at<JSON::Number>("gc/path_removals_failed"));
+ ASSERT_SOME(metrics.at<JSON::Number>("gc/path_removals_succeeded"));
EXPECT_GT(
- metrics.at<JSON::Number>("gc/path_removals_failed")->as<unsigned>(),
+ metrics.at<JSON::Number>("gc/path_removals_succeeded")->as<unsigned>(),
0u);
+ ASSERT_FALSE(os::exists(path::join(sandbox, mountPoint)));
+ ASSERT_TRUE(os::exists(path::join(hostPath, fileInVolume)));
+
Clock::resume();
driver.stop();
driver.join();
[2/3] mesos git commit: Skipped metric for non existing paths in gc.
Posted by zh...@apache.org.
Skipped metric for non existing paths in gc.
Previously, agent gc would increment the "failed" counter if the path
does not exist, but this should not be an issue. This patch skipped such
paths in both "failed" and "succeeded" counters.
Review: https://reviews.apache.org/r/67423
Project: http://git-wip-us.apache.org/repos/asf/mesos/repo
Commit: http://git-wip-us.apache.org/repos/asf/mesos/commit/644ffc8e
Tree: http://git-wip-us.apache.org/repos/asf/mesos/tree/644ffc8e
Diff: http://git-wip-us.apache.org/repos/asf/mesos/diff/644ffc8e
Branch: refs/heads/master
Commit: 644ffc8e4b273afc0cdcb4053d8efa82d112d1b4
Parents: db2d1c2
Author: Zhitao Li <zh...@gmail.com>
Authored: Fri Jun 1 22:09:11 2018 -0700
Committer: Zhitao Li <zh...@gmail.com>
Committed: Tue Jun 12 13:20:02 2018 -0700
----------------------------------------------------------------------
src/slave/gc.cpp | 16 +++++++++++-----
1 file changed, 11 insertions(+), 5 deletions(-)
----------------------------------------------------------------------
http://git-wip-us.apache.org/repos/asf/mesos/blob/644ffc8e/src/slave/gc.cpp
----------------------------------------------------------------------
diff --git a/src/slave/gc.cpp b/src/slave/gc.cpp
index 8770d88..407f6b2 100644
--- a/src/slave/gc.cpp
+++ b/src/slave/gc.cpp
@@ -271,11 +271,17 @@ void GarbageCollectorProcess::remove(const Timeout& removalTime)
Try<Nothing> rmdir = os::rmdir(info->path, true, true, true);
if (rmdir.isError()) {
- LOG(WARNING) << "Failed to delete '" << info->path << "': "
- << rmdir.error();
- info->promise.fail(rmdir.error());
-
- ++failed;
+ // TODO(zhitao): Change return value type of `rmdir` to
+ // `Try<Nothing, ErrnoError>` and check error type instead.
+ if (rmdir.error() == ErrnoError(ENOENT).message) {
+ LOG(INFO) << "Skipped '" << info->path << "' which does not exist";
+ } else {
+ LOG(WARNING) << "Failed to delete '" << info->path << "': "
+ << rmdir.error();
+ info->promise.fail(rmdir.error());
+
+ ++failed;
+ }
} else {
LOG(INFO) << "Deleted '" << info->path << "'";
info->promise.set(rmdir.get());