Always attempt retry of job trace read when file is missing

In https://gitlab.com/gitlab-org/gitlab/-/merge_requests/40075, we added
a check for the write lock to determine whether to retry reading a
missing, archived build log. However, in production, it appears this
issue is still happening about 1000 times a day, so let's always retry
to see if this reduces that incident rate.

This reverts commit f09bbb5808d1d9a3b57822233124a6ee6b9b10c8.

changelogs/unreleased/sh-always-retry-read-build-logs.yml

+---
+title: Always attempt retry of job trace read when file is missing
+merge_request: 40516
+author:
+type: fixed

lib/gitlab/ci/trace.rb

@@ -79,9 +79,7 @@ module Gitlab
         job.trace_chunks.any? || current_path.present? || old_trace.present?
       end
 
-      def read(&block)
-        should_retry = true if lock_taken?(lock_key)
-
+      def read(should_retry: true, &block)
         read_stream(&block)
       rescue Errno::ENOENT
         raise unless should_retry
@@ -195,13 +193,10 @@ module Gitlab
       end
 
       def in_write_lock(&blk)
+        lock_key = "trace:write:lock:#{job.id}"
         in_lock(lock_key, ttl: LOCK_TTL, retries: LOCK_RETRIES, sleep_sec: LOCK_SLEEP, &blk)
       end
 
-      def lock_key
-        "trace:write:lock:#{job.id}"
-      end
-
       def archive_stream!(stream)
         clone_file!(stream, JobArtifactUploader.workhorse_upload_path) do |clone_path|
           create_build_trace!(job, clone_path)

lib/gitlab/exclusive_lease_helpers.rb

@@ -39,10 +39,5 @@ module Gitlab
     ensure
       lease&.cancel
     end
-
-    def lock_taken?(key)
-      lease = Gitlab::ExclusiveLease.new(key, timeout: 0)
-      lease.exists?
-    end
   end
 end

spec/lib/gitlab/ci/trace_spec.rb

@@ -23,17 +23,6 @@ RSpec.describe Gitlab::Ci::Trace, :clean_gitlab_redis_shared_state do
       artifact1.file.migrate!(ObjectStorage::Store::REMOTE)
     end
 
-    context 'when write lock is not present' do
-      it 'raises an exception' do
-        expect { artifact2.job.trace.raw }.to raise_error(Errno::ENOENT)
-      end
-    end
-
-    context 'when write lock is present', :clean_gitlab_redis_shared_state do
-      before do
-        Gitlab::ExclusiveLease.new("trace:write:lock:#{job.id}", timeout: 10.seconds).try_obtain
-      end
-
     it 'reloads the trace after is it migrated' do
       stub_const('Gitlab::HttpIO::BUFFER_SIZE', test_data.length)
 
@@ -44,7 +33,6 @@ RSpec.describe Gitlab::Ci::Trace, :clean_gitlab_redis_shared_state do
       expect(artifact2.job.trace.raw).to eq(test_data)
     end
   end
-  end
 
   context 'when live trace feature is disabled' do
     before do

spec/lib/gitlab/exclusive_lease_helpers_spec.rb

@@ -111,14 +111,4 @@ RSpec.describe Gitlab::ExclusiveLeaseHelpers, :clean_gitlab_redis_shared_state d
       end
     end
   end
-
-  describe '#lock_taken?' do
-    it 'returns true when lock has been taken' do
-      expect(class_instance.lock_taken?(unique_key)).to be false
-
-      class_instance.in_lock(unique_key) do
-        expect(class_instance.lock_taken?(unique_key)).to be true
-      end
-    end
-  end
 end