[
https://issues.apache.org/jira/browse/RATIS-1674?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Song Ziyang updated RATIS-1674:
-------------------------------
Description:
*After grpc 1.48.1 release, we packaged ratis with master branch and thirdparty
1.0.2 and test whether out of direct memory issue is fixed. Unfortunately, this
error is again reproduced.*
*See the error stack:*
2022-08-16 15:28:45,962
[172.20.70.24_40010@group-000100000001->172.20.70.23_40010-GrpcLogAppender-LogAppenderDaemon]
ERROR o.a.r.s.l.LogAppenderDaemon:86 -
172.20.70.24_40010@group-000100000001->172.20.70.23_40010-GrpcLogAppender-LogAppenderDaemon
failed
org.apache.ratis.thirdparty.io.netty.util.internal.OutOfDirectMemoryError:
failed to allocate 2097152 byte(s) of direct memory (used: 17177772311, max:
17179869184)
at
org.apache.ratis.thirdparty.io.netty.util.internal.PlatformDependent.incrementMemoryCounter(PlatformDependent.java:806)
at
org.apache.ratis.thirdparty.io.netty.util.internal.PlatformDependent.allocateDirectNoCleaner(PlatformDependent.java:735)
at
org.apache.ratis.thirdparty.io.netty.buffer.PoolArena$DirectArena.allocateDirect(PoolArena.java:649)
at
org.apache.ratis.thirdparty.io.netty.buffer.PoolArena$DirectArena.newChunk(PoolArena.java:624)
at
org.apache.ratis.thirdparty.io.netty.buffer.PoolArena.allocateNormal(PoolArena.java:203)
at
org.apache.ratis.thirdparty.io.netty.buffer.PoolArena.tcacheAllocateNormal(PoolArena.java:187)
at
org.apache.ratis.thirdparty.io.netty.buffer.PoolArena.allocate(PoolArena.java:136)
at
org.apache.ratis.thirdparty.io.netty.buffer.PoolArena.allocate(PoolArena.java:126)
at
org.apache.ratis.thirdparty.io.netty.buffer.PooledByteBufAllocator.newDirectBuffer(PooledByteBufAllocator.java:396)
at
org.apache.ratis.thirdparty.io.netty.buffer.AbstractByteBufAllocator.directBuffer(AbstractByteBufAllocator.java:188)
at
org.apache.ratis.thirdparty.io.netty.buffer.AbstractByteBufAllocator.buffer(AbstractByteBufAllocator.java:124)
at
org.apache.ratis.thirdparty.io.grpc.netty.NettyWritableBufferAllocator.allocate(NettyWritableBufferAllocator.java:51)
at
org.apache.ratis.thirdparty.io.grpc.internal.MessageFramer.writeRaw(MessageFramer.java:285)
at
org.apache.ratis.thirdparty.io.grpc.internal.MessageFramer.access$400(MessageFramer.java:43)
at
org.apache.ratis.thirdparty.io.grpc.internal.MessageFramer$OutputStreamAdapter.write(MessageFramer.java:375)
at
org.apache.ratis.thirdparty.com.google.protobuf.CodedOutputStream$OutputStreamEncoder.write(CodedOutputStream.java:3005)
at
org.apache.ratis.thirdparty.com.google.protobuf.CodedOutputStream$OutputStreamEncoder.writeLazy(CodedOutputStream.java:3013)
at
org.apache.ratis.thirdparty.com.google.protobuf.ByteString$LiteralByteString.writeTo(ByteString.java:1411)
at
org.apache.ratis.thirdparty.com.google.protobuf.CodedOutputStream$OutputStreamEncoder.writeBytesNoTag(CodedOutputStream.java:2801)
at
org.apache.ratis.thirdparty.com.google.protobuf.CodedOutputStream$OutputStreamEncoder.writeBytes(CodedOutputStream.java:2775)
at
org.apache.ratis.proto.RaftProtos$StateMachineLogEntryProto.writeTo(RaftProtos.java:7869)
at
org.apache.ratis.thirdparty.com.google.protobuf.CodedOutputStream$OutputStreamEncoder.writeMessageNoTag(CodedOutputStream.java:2855)
at
org.apache.ratis.thirdparty.com.google.protobuf.CodedOutputStream$OutputStreamEncoder.writeMessage(CodedOutputStream.java:2824)
at
org.apache.ratis.proto.RaftProtos$LogEntryProto.writeTo(RaftProtos.java:9503)
at
org.apache.ratis.thirdparty.com.google.protobuf.CodedOutputStream$OutputStreamEncoder.writeMessageNoTag(CodedOutputStream.java:2855)
at
org.apache.ratis.thirdparty.com.google.protobuf.CodedOutputStream$OutputStreamEncoder.writeMessage(CodedOutputStream.java:2824)
at
org.apache.ratis.proto.RaftProtos$AppendEntriesRequestProto.writeTo(RaftProtos.java:17799)
at
org.apache.ratis.thirdparty.com.google.protobuf.AbstractMessageLite.writeTo(AbstractMessageLite.java:83)
at
org.apache.ratis.thirdparty.io.grpc.protobuf.lite.ProtoInputStream.drainTo(ProtoInputStream.java:52)
at
org.apache.ratis.thirdparty.io.grpc.internal.MessageFramer.writeToOutputStream(MessageFramer.java:267)
at
org.apache.ratis.thirdparty.io.grpc.internal.MessageFramer.writeKnownLengthUncompressed(MessageFramer.java:229)
at
org.apache.ratis.thirdparty.io.grpc.internal.MessageFramer.writeUncompressed(MessageFramer.java:168)
at
org.apache.ratis.thirdparty.io.grpc.internal.MessageFramer.writePayload(MessageFramer.java:141)
at
org.apache.ratis.thirdparty.io.grpc.internal.AbstractStream.writeMessage(AbstractStream.java:65)
at
org.apache.ratis.thirdparty.io.grpc.internal.ForwardingClientStream.writeMessage(ForwardingClientStream.java:37)
at
org.apache.ratis.thirdparty.io.grpc.internal.RetriableStream.sendMessage(RetriableStream.java:545)
at
org.apache.ratis.thirdparty.io.grpc.internal.ClientCallImpl.sendMessageInternal(ClientCallImpl.java:520)
at
org.apache.ratis.thirdparty.io.grpc.internal.ClientCallImpl.sendMessage(ClientCallImpl.java:506)
at
org.apache.ratis.thirdparty.io.grpc.stub.ClientCalls$CallToStreamObserverAdapter.onNext(ClientCalls.java:374)
at
org.apache.ratis.grpc.server.GrpcLogAppender$StreamObservers.onNext(GrpcLogAppender.java:236)
at
org.apache.ratis.grpc.server.GrpcLogAppender.lambda$sendRequest$1(GrpcLogAppender.java:285)
at java.util.Optional.map(Optional.java:215)
at
org.apache.ratis.grpc.server.GrpcLogAppender.sendRequest(GrpcLogAppender.java:284)
at
org.apache.ratis.grpc.server.GrpcLogAppender.appendLog(GrpcLogAppender.java:276)
at
org.apache.ratis.grpc.server.GrpcLogAppender.run(GrpcLogAppender.java:160)
at
org.apache.ratis.server.leader.LogAppenderDaemon.run(LogAppenderDaemon.java:77)
at java.lang.Thread.run(Thread.java:748)
2022-08-16 15:28:45,963 [grpc-default-executor-2] WARN
o.a.ratis.util.LogUtils:122 -
172.20.70.24_40010@group-000100000001->172.20.70.23_40010-AppendLogResponseHandler:
Failed appendEntries:
org.apache.ratis.thirdparty.io.grpc.StatusRuntimeException: CANCELLED: Client
sendMessage() failed with Error
2022-08-16 15:28:45,963
[172.20.70.24_40010@group-000100000001->172.20.70.23_40010-GrpcLogAppender-LogAppenderDaemon]
INFO o.a.r.s.i.LeaderStateImpl:531 -
172.20.70.24_40010@group-000100000001-LeaderStateImpl: Restarting
GrpcLogAppender for 172.20.70.24_40010@group-000100000001->172.20.70.23_40010
{color:#ff0000}*However, we discover some other abnormalities.* {color}
*That is, one follower often report that it receives inconsistent AppendEntries
from leader as the first entry in AE already exists locally. After some
complaining on "inconsistent appendEntry", this follower can still write logs
to RaftLog from time to time. The "inconsistent AE" and "success log write" are
interleaved. See follower log:*
2022-08-16 15:25:43,253
[172.20.70.23_40010@group-000100000001-SegmentedRaftLogWorker] INFO
o.a.r.s.r.s.SegmentedRaftLogWorker$StartLogSegment:629 -
172.20.70.23_40010@group-000100000001-SegmentedRaftLogWorker: created new log
segment
/data/cluster/first-rest-test/DataNode/apache-iotdb/datanode/sbin/../data/consensus/data_region/47474747-4747-4747-4747-000100000001/current/log_inprogress_1376
2022-08-16 15:25:43,345 [172.20.70.23_40010-server-thread2] INFO
o.a.r.s.i.RaftServerImpl:1475 - 172.20.70.23_40010@group-000100000001: Failed
appendEntries as the first entry (index 1283) already exists (snapshotIndex:
-1, commitIndex: 1393)
2022-08-16 15:25:43,345 [172.20.70.23_40010-server-thread2] INFO
o.a.r.s.i.RaftServerImpl:1455 - 172.20.70.23_40010@group-000100000001:
inconsistency entries.
Reply:172.20.70.24_40010<-172.20.70.23_40010#2960:FAIL-t1,INCONSISTENCY,nextIndex=1394,followerCommit=1393,matchIndex=-1
2022-08-16 15:25:43,358 [172.20.70.23_40010-server-thread2] INFO
o.a.r.s.i.RaftServerImpl:1475 - 172.20.70.23_40010@group-000100000001: Failed
appendEntries as the first entry (index 1287) already exists (snapshotIndex:
-1, commitIndex: 1393)
2022-08-16 15:25:43,359 [172.20.70.23_40010-server-thread2] INFO
o.a.r.s.i.RaftServerImpl:1455 - 172.20.70.23_40010@group-000100000001:
inconsistency entries.
Reply:172.20.70.24_40010<-172.20.70.23_40010#2961:FAIL-t1,INCONSISTENCY,nextIndex=1394,followerCommit=1393,matchIndex=-1
2022-08-16 15:25:43,374 [172.20.70.23_40010-server-thread2] INFO
o.a.r.s.i.RaftServerImpl:1475 - 172.20.70.23_40010@group-000100000001: Failed
appendEntries as the first entry (index 1290) already exists (snapshotIndex:
-1, commitIndex: 1393)
2022-08-16 15:25:43,374 [172.20.70.23_40010-server-thread2] INFO
o.a.r.s.i.RaftServerImpl:1455 - 172.20.70.23_40010@group-000100000001:
inconsistency entries.
Reply:172.20.70.24_40010<-172.20.70.23_40010#2962:FAIL-t1,INCONSISTENCY,nextIndex=1394,followerCommit=1393,matchIndex=-1
2022-08-16 15:25:43,387 [172.20.70.23_40010-server-thread2] INFO
o.a.r.s.i.RaftServerImpl:1475 - 172.20.70.23_40010@group-000100000001: Failed
appendEntries as the first entry (index 1294) already exists (snapshotIndex:
-1, commitIndex: 1393)
2022-08-16 15:25:43,387 [172.20.70.23_40010-server-thread2] INFO
o.a.r.s.i.RaftServerImpl:1455 - 172.20.70.23_40010@group-000100000001:
inconsistency entries.
Reply:172.20.70.24_40010<-172.20.70.23_40010#2963:FAIL-t1,INCONSISTENCY,nextIndex=1394,followerCommit=1393,matchIndex=-1
2022-08-16 15:25:43,983 [172.20.70.23_40010-server-thread2] INFO
o.a.r.s.i.RaftServerImpl:1475 - 172.20.70.23_40010@group-000100000001: Failed
appendEntries as the first entry (index 1297) already exists (snapshotIndex:
-1, commitIndex: 1393)
2022-08-16 15:25:43,984 [172.20.70.23_40010-server-thread2] INFO
o.a.r.s.i.RaftServerImpl:1455 - 172.20.70.23_40010@group-000100000001:
inconsistency entries.
Reply:172.20.70.24_40010<-172.20.70.23_40010#2964:FAIL-t1,INCONSISTENCY,nextIndex=1394,followerCommit=1393,matchIndex=-1
{color:#0747a6}(successfully write after some inconsistency AE){color}
{color:#0747a6}2022-08-16 15:25:44,011 [172.20.70.23_40010-server-thread2] INFO
o.a.r.s.r.s.SegmentedRaftLogWorker:430 -
172.20.70.23_40010@group-000100000001-SegmentedRaftLogWorker: Rolling segment
log-1376_1394 to index:1394{color}
{color:#0747a6}2022-08-16 15:25:44,017
[172.20.70.23_40010@group-000100000001-SegmentedRaftLogWorker] INFO
o.a.r.s.r.s.SegmentedRaftLogWorker$FinalizeLogSegment:586 -
172.20.70.23_40010@group-000100000001-SegmentedRaftLogWorker: Rolled log
segment from
/data/cluster/first-rest-test/DataNode/apache-iotdb/datanode/sbin/../data/consensus/data_region/47474747-4747-4747-4747-000100000001/current/log_inprogress_1376
to
/data/cluster/first-rest-test/DataNode/apache-iotdb/datanode/sbin/../data/consensus/data_region/47474747-4747-4747-4747-000100000001/current/log_1376-1394{color}
{color:#0747a6}2022-08-16 15:25:44,028
[172.20.70.23_40010@group-000100000001-SegmentedRaftLogWorker] INFO
o.a.r.s.r.s.SegmentedRaftLogWorker$StartLogSegment:629 -
172.20.70.23_40010@group-000100000001-SegmentedRaftLogWorker: created new log
segment
/data/cluster/first-rest-test/DataNode/apache-iotdb/datanode/sbin/../data/consensus/data_region/47474747-4747-4747-4747-000100000001/current/log_inprogress_1395{color}
2022-08-16 15:25:44,137 [172.20.70.23_40010-server-thread2] INFO
o.a.r.s.i.RaftServerImpl:1475 - 172.20.70.23_40010@group-000100000001: Failed
appendEntries as the first entry (index 1394) already exists (snapshotIndex:
-1, commitIndex: 1395)
2022-08-16 15:25:44,137 [172.20.70.23_40010-server-thread2] INFO
o.a.r.s.i.RaftServerImpl:1455 - 172.20.70.23_40010@group-000100000001:
inconsistency entries.
Reply:172.20.70.24_40010<-172.20.70.23_40010#2966:FAIL-t1,INCONSISTENCY,nextIndex=1396,followerCommit=1395,matchIndex=-1
2022-08-16 15:25:44,158 [172.20.70.23_40010-server-thread2] INFO
o.a.r.s.i.RaftServerImpl:1475 - 172.20.70.23_40010@group-000100000001: Failed
appendEntries as the first entry (index 1394) already exists (snapshotIndex:
-1, commitIndex: 1395)
2022-08-16 15:25:44,158 [172.20.70.23_40010-server-thread2] INFO
o.a.r.s.i.RaftServerImpl:1455 - 172.20.70.23_40010@group-000100000001:
inconsistency entries.
Reply:172.20.70.24_40010<-172.20.70.23_40010#2967:FAIL-t1,INCONSISTENCY,nextIndex=1396,followerCommit=1395,matchIndex=-1
2022-08-16 15:25:44,229 [172.20.70.23_40010-server-thread2] INFO
o.a.r.s.r.s.SegmentedRaftLogWorker:430 -
172.20.70.23_40010@group-000100000001-SegmentedRaftLogWorker: Rolling segment
log-1395_1411 to index:1411
2022-08-16 15:25:44,247 [172.20.70.23_40010-server-thread2] INFO
o.a.r.s.i.RaftServerImpl:1475 - 172.20.70.23_40010@group-000100000001: Failed
appendEntries as the first entry (index 1394) already exists (snapshotIndex:
-1, commitIndex: 1403)
2022-08-16 15:25:44,248 [172.20.70.23_40010-server-thread2] INFO
o.a.r.s.i.RaftServerImpl:1455 - 172.20.70.23_40010@group-000100000001:
inconsistency entries.
Reply:172.20.70.24_40010<-172.20.70.23_40010#2980:FAIL-t1,INCONSISTENCY,nextIndex=1404,followerCommit=1403,matchIndex=-1
*Meanwhile, the leader keeps reporting changing this follower's nextIndex*
2022-08-16 15:25:44,612 [grpc-default-executor-2] INFO
o.a.r.s.i.FollowerInfoImpl:48 -
172.20.70.24_40010@group-000100000001->172.20.70.23_40010: nextIndex:
updateUnconditionally 1403 -> 1403
2022-08-16 15:25:44,649 [grpc-default-executor-2] INFO
o.a.r.s.i.FollowerInfoImpl:48 -
172.20.70.24_40010@group-000100000001->172.20.70.23_40010: nextIndex:
updateUnconditionally 1405 -> 1403
*{color:#ff0000}I looked back at previous directOOM logs and discovered this
similar log pattern. Since these "inconsistent AppendEntries" are sent from
leader almost with 0 waiting time (according to follower reply timestamp), I
guess directOOM may related to continuous Leader "inconsistent AppendEntries",
which consumes lots of direct memory for network transimission.{color}*
{*}Through, I'm confused why a follower will report inconsistent from time to
time while still can successfully append logs between these "inconsistent
AppendEntries"{*}{*}, why leader keeps sending “inconsistent AE" with zero
waiting time{*}{*}. There is no obvious network congestion.{*}
*FYI, I've set RaftLog forceFlush to false. {color:#172b4d}I'm not sure whether
this async disk flush strategy is the cause for above abnormalities.{color}*
*{color:#172b4d}I'll be grateful if anyone can help me with this issue. Thanks
in advance!{color}*
was:
*After grpc 1.48.1 release, we packaged ratis with master branch and thirdparty
1.0.2 and test whether out of direct memory issue is fixed. Unfortunately, this
error is again reproduced.*
*See the error stack:*
2022-08-16 15:28:45,962
[172.20.70.24_40010@group-000100000001->172.20.70.23_40010-GrpcLogAppender-LogAppenderDaemon]
ERROR o.a.r.s.l.LogAppenderDaemon:86 -
172.20.70.24_40010@group-000100000001->172.20.70.23_40010-GrpcLogAppender-LogAppenderDaemon
failed
org.apache.ratis.thirdparty.io.netty.util.internal.OutOfDirectMemoryError:
failed to allocate 2097152 byte(s) of direct memory (used: 17177772311, max:
17179869184)
at
org.apache.ratis.thirdparty.io.netty.util.internal.PlatformDependent.incrementMemoryCounter(PlatformDependent.java:806)
at
org.apache.ratis.thirdparty.io.netty.util.internal.PlatformDependent.allocateDirectNoCleaner(PlatformDependent.java:735)
at
org.apache.ratis.thirdparty.io.netty.buffer.PoolArena$DirectArena.allocateDirect(PoolArena.java:649)
at
org.apache.ratis.thirdparty.io.netty.buffer.PoolArena$DirectArena.newChunk(PoolArena.java:624)
at
org.apache.ratis.thirdparty.io.netty.buffer.PoolArena.allocateNormal(PoolArena.java:203)
at
org.apache.ratis.thirdparty.io.netty.buffer.PoolArena.tcacheAllocateNormal(PoolArena.java:187)
at
org.apache.ratis.thirdparty.io.netty.buffer.PoolArena.allocate(PoolArena.java:136)
at
org.apache.ratis.thirdparty.io.netty.buffer.PoolArena.allocate(PoolArena.java:126)
at
org.apache.ratis.thirdparty.io.netty.buffer.PooledByteBufAllocator.newDirectBuffer(PooledByteBufAllocator.java:396)
at
org.apache.ratis.thirdparty.io.netty.buffer.AbstractByteBufAllocator.directBuffer(AbstractByteBufAllocator.java:188)
at
org.apache.ratis.thirdparty.io.netty.buffer.AbstractByteBufAllocator.buffer(AbstractByteBufAllocator.java:124)
at
org.apache.ratis.thirdparty.io.grpc.netty.NettyWritableBufferAllocator.allocate(NettyWritableBufferAllocator.java:51)
at
org.apache.ratis.thirdparty.io.grpc.internal.MessageFramer.writeRaw(MessageFramer.java:285)
at
org.apache.ratis.thirdparty.io.grpc.internal.MessageFramer.access$400(MessageFramer.java:43)
at
org.apache.ratis.thirdparty.io.grpc.internal.MessageFramer$OutputStreamAdapter.write(MessageFramer.java:375)
at
org.apache.ratis.thirdparty.com.google.protobuf.CodedOutputStream$OutputStreamEncoder.write(CodedOutputStream.java:3005)
at
org.apache.ratis.thirdparty.com.google.protobuf.CodedOutputStream$OutputStreamEncoder.writeLazy(CodedOutputStream.java:3013)
at
org.apache.ratis.thirdparty.com.google.protobuf.ByteString$LiteralByteString.writeTo(ByteString.java:1411)
at
org.apache.ratis.thirdparty.com.google.protobuf.CodedOutputStream$OutputStreamEncoder.writeBytesNoTag(CodedOutputStream.java:2801)
at
org.apache.ratis.thirdparty.com.google.protobuf.CodedOutputStream$OutputStreamEncoder.writeBytes(CodedOutputStream.java:2775)
at
org.apache.ratis.proto.RaftProtos$StateMachineLogEntryProto.writeTo(RaftProtos.java:7869)
at
org.apache.ratis.thirdparty.com.google.protobuf.CodedOutputStream$OutputStreamEncoder.writeMessageNoTag(CodedOutputStream.java:2855)
at
org.apache.ratis.thirdparty.com.google.protobuf.CodedOutputStream$OutputStreamEncoder.writeMessage(CodedOutputStream.java:2824)
at
org.apache.ratis.proto.RaftProtos$LogEntryProto.writeTo(RaftProtos.java:9503)
at
org.apache.ratis.thirdparty.com.google.protobuf.CodedOutputStream$OutputStreamEncoder.writeMessageNoTag(CodedOutputStream.java:2855)
at
org.apache.ratis.thirdparty.com.google.protobuf.CodedOutputStream$OutputStreamEncoder.writeMessage(CodedOutputStream.java:2824)
at
org.apache.ratis.proto.RaftProtos$AppendEntriesRequestProto.writeTo(RaftProtos.java:17799)
at
org.apache.ratis.thirdparty.com.google.protobuf.AbstractMessageLite.writeTo(AbstractMessageLite.java:83)
at
org.apache.ratis.thirdparty.io.grpc.protobuf.lite.ProtoInputStream.drainTo(ProtoInputStream.java:52)
at
org.apache.ratis.thirdparty.io.grpc.internal.MessageFramer.writeToOutputStream(MessageFramer.java:267)
at
org.apache.ratis.thirdparty.io.grpc.internal.MessageFramer.writeKnownLengthUncompressed(MessageFramer.java:229)
at
org.apache.ratis.thirdparty.io.grpc.internal.MessageFramer.writeUncompressed(MessageFramer.java:168)
at
org.apache.ratis.thirdparty.io.grpc.internal.MessageFramer.writePayload(MessageFramer.java:141)
at
org.apache.ratis.thirdparty.io.grpc.internal.AbstractStream.writeMessage(AbstractStream.java:65)
at
org.apache.ratis.thirdparty.io.grpc.internal.ForwardingClientStream.writeMessage(ForwardingClientStream.java:37)
at
org.apache.ratis.thirdparty.io.grpc.internal.RetriableStream.sendMessage(RetriableStream.java:545)
at
org.apache.ratis.thirdparty.io.grpc.internal.ClientCallImpl.sendMessageInternal(ClientCallImpl.java:520)
at
org.apache.ratis.thirdparty.io.grpc.internal.ClientCallImpl.sendMessage(ClientCallImpl.java:506)
at
org.apache.ratis.thirdparty.io.grpc.stub.ClientCalls$CallToStreamObserverAdapter.onNext(ClientCalls.java:374)
at
org.apache.ratis.grpc.server.GrpcLogAppender$StreamObservers.onNext(GrpcLogAppender.java:236)
at
org.apache.ratis.grpc.server.GrpcLogAppender.lambda$sendRequest$1(GrpcLogAppender.java:285)
at java.util.Optional.map(Optional.java:215)
at
org.apache.ratis.grpc.server.GrpcLogAppender.sendRequest(GrpcLogAppender.java:284)
at
org.apache.ratis.grpc.server.GrpcLogAppender.appendLog(GrpcLogAppender.java:276)
at
org.apache.ratis.grpc.server.GrpcLogAppender.run(GrpcLogAppender.java:160)
at
org.apache.ratis.server.leader.LogAppenderDaemon.run(LogAppenderDaemon.java:77)
at java.lang.Thread.run(Thread.java:748)
2022-08-16 15:28:45,963 [grpc-default-executor-2] WARN
o.a.ratis.util.LogUtils:122 -
172.20.70.24_40010@group-000100000001->172.20.70.23_40010-AppendLogResponseHandler:
Failed appendEntries:
org.apache.ratis.thirdparty.io.grpc.StatusRuntimeException: CANCELLED: Client
sendMessage() failed with Error
2022-08-16 15:28:45,963
[172.20.70.24_40010@group-000100000001->172.20.70.23_40010-GrpcLogAppender-LogAppenderDaemon]
INFO o.a.r.s.i.LeaderStateImpl:531 -
172.20.70.24_40010@group-000100000001-LeaderStateImpl: Restarting
GrpcLogAppender for 172.20.70.24_40010@group-000100000001->172.20.70.23_40010
{color:#ff0000}*However, we discover some other abnormalities.* {color}
*That is, one follower often report that it receives inconsistent AppendEntries
from leader as the first entry in AE already exists locally. After some
complaining on "inconsistent appendEntry", this follower can still write logs
to RaftLog from time to time. The "inconsistent AE" and "success log write" are
interleaved. See follower log:*
2022-08-16 15:25:43,253
[172.20.70.23_40010@group-000100000001-SegmentedRaftLogWorker] INFO
o.a.r.s.r.s.SegmentedRaftLogWorker$StartLogSegment:629 -
172.20.70.23_40010@group-000100000001-SegmentedRaftLogWorker: created new log
segment
/data/cluster/first-rest-test/DataNode/apache-iotdb/datanode/sbin/../data/consensus/data_region/47474747-4747-4747-4747-000100000001/current/log_inprogress_1376
2022-08-16 15:25:43,345 [172.20.70.23_40010-server-thread2] INFO
o.a.r.s.i.RaftServerImpl:1475 - 172.20.70.23_40010@group-000100000001: Failed
appendEntries as the first entry (index 1283) already exists (snapshotIndex:
-1, commitIndex: 1393)
2022-08-16 15:25:43,345 [172.20.70.23_40010-server-thread2] INFO
o.a.r.s.i.RaftServerImpl:1455 - 172.20.70.23_40010@group-000100000001:
inconsistency entries.
Reply:172.20.70.24_40010<-172.20.70.23_40010#2960:FAIL-t1,INCONSISTENCY,nextIndex=1394,followerCommit=1393,matchIndex=-1
2022-08-16 15:25:43,358 [172.20.70.23_40010-server-thread2] INFO
o.a.r.s.i.RaftServerImpl:1475 - 172.20.70.23_40010@group-000100000001: Failed
appendEntries as the first entry (index 1287) already exists (snapshotIndex:
-1, commitIndex: 1393)
2022-08-16 15:25:43,359 [172.20.70.23_40010-server-thread2] INFO
o.a.r.s.i.RaftServerImpl:1455 - 172.20.70.23_40010@group-000100000001:
inconsistency entries.
Reply:172.20.70.24_40010<-172.20.70.23_40010#2961:FAIL-t1,INCONSISTENCY,nextIndex=1394,followerCommit=1393,matchIndex=-1
2022-08-16 15:25:43,374 [172.20.70.23_40010-server-thread2] INFO
o.a.r.s.i.RaftServerImpl:1475 - 172.20.70.23_40010@group-000100000001: Failed
appendEntries as the first entry (index 1290) already exists (snapshotIndex:
-1, commitIndex: 1393)
2022-08-16 15:25:43,374 [172.20.70.23_40010-server-thread2] INFO
o.a.r.s.i.RaftServerImpl:1455 - 172.20.70.23_40010@group-000100000001:
inconsistency entries.
Reply:172.20.70.24_40010<-172.20.70.23_40010#2962:FAIL-t1,INCONSISTENCY,nextIndex=1394,followerCommit=1393,matchIndex=-1
2022-08-16 15:25:43,387 [172.20.70.23_40010-server-thread2] INFO
o.a.r.s.i.RaftServerImpl:1475 - 172.20.70.23_40010@group-000100000001: Failed
appendEntries as the first entry (index 1294) already exists (snapshotIndex:
-1, commitIndex: 1393)
2022-08-16 15:25:43,387 [172.20.70.23_40010-server-thread2] INFO
o.a.r.s.i.RaftServerImpl:1455 - 172.20.70.23_40010@group-000100000001:
inconsistency entries.
Reply:172.20.70.24_40010<-172.20.70.23_40010#2963:FAIL-t1,INCONSISTENCY,nextIndex=1394,followerCommit=1393,matchIndex=-1
2022-08-16 15:25:43,983 [172.20.70.23_40010-server-thread2] INFO
o.a.r.s.i.RaftServerImpl:1475 - 172.20.70.23_40010@group-000100000001: Failed
appendEntries as the first entry (index 1297) already exists (snapshotIndex:
-1, commitIndex: 1393)
2022-08-16 15:25:43,984 [172.20.70.23_40010-server-thread2] INFO
o.a.r.s.i.RaftServerImpl:1455 - 172.20.70.23_40010@group-000100000001:
inconsistency entries.
Reply:172.20.70.24_40010<-172.20.70.23_40010#2964:FAIL-t1,INCONSISTENCY,nextIndex=1394,followerCommit=1393,matchIndex=-1
{color:#0747a6}(successfully write after some inconsistency AE){color}
{color:#0747a6}2022-08-16 15:25:44,011 [172.20.70.23_40010-server-thread2] INFO
o.a.r.s.r.s.SegmentedRaftLogWorker:430 -
172.20.70.23_40010@group-000100000001-SegmentedRaftLogWorker: Rolling segment
log-1376_1394 to index:1394{color}
{color:#0747a6}2022-08-16 15:25:44,017
[172.20.70.23_40010@group-000100000001-SegmentedRaftLogWorker] INFO
o.a.r.s.r.s.SegmentedRaftLogWorker$FinalizeLogSegment:586 -
172.20.70.23_40010@group-000100000001-SegmentedRaftLogWorker: Rolled log
segment from
/data/cluster/first-rest-test/DataNode/apache-iotdb/datanode/sbin/../data/consensus/data_region/47474747-4747-4747-4747-000100000001/current/log_inprogress_1376
to
/data/cluster/first-rest-test/DataNode/apache-iotdb/datanode/sbin/../data/consensus/data_region/47474747-4747-4747-4747-000100000001/current/log_1376-1394{color}
{color:#0747a6}2022-08-16 15:25:44,028
[172.20.70.23_40010@group-000100000001-SegmentedRaftLogWorker] INFO
o.a.r.s.r.s.SegmentedRaftLogWorker$StartLogSegment:629 -
172.20.70.23_40010@group-000100000001-SegmentedRaftLogWorker: created new log
segment
/data/cluster/first-rest-test/DataNode/apache-iotdb/datanode/sbin/../data/consensus/data_region/47474747-4747-4747-4747-000100000001/current/log_inprogress_1395{color}
2022-08-16 15:25:44,137 [172.20.70.23_40010-server-thread2] INFO
o.a.r.s.i.RaftServerImpl:1475 - 172.20.70.23_40010@group-000100000001: Failed
appendEntries as the first entry (index 1394) already exists (snapshotIndex:
-1, commitIndex: 1395)
2022-08-16 15:25:44,137 [172.20.70.23_40010-server-thread2] INFO
o.a.r.s.i.RaftServerImpl:1455 - 172.20.70.23_40010@group-000100000001:
inconsistency entries.
Reply:172.20.70.24_40010<-172.20.70.23_40010#2966:FAIL-t1,INCONSISTENCY,nextIndex=1396,followerCommit=1395,matchIndex=-1
2022-08-16 15:25:44,158 [172.20.70.23_40010-server-thread2] INFO
o.a.r.s.i.RaftServerImpl:1475 - 172.20.70.23_40010@group-000100000001: Failed
appendEntries as the first entry (index 1394) already exists (snapshotIndex:
-1, commitIndex: 1395)
2022-08-16 15:25:44,158 [172.20.70.23_40010-server-thread2] INFO
o.a.r.s.i.RaftServerImpl:1455 - 172.20.70.23_40010@group-000100000001:
inconsistency entries.
Reply:172.20.70.24_40010<-172.20.70.23_40010#2967:FAIL-t1,INCONSISTENCY,nextIndex=1396,followerCommit=1395,matchIndex=-1
2022-08-16 15:25:44,229 [172.20.70.23_40010-server-thread2] INFO
o.a.r.s.r.s.SegmentedRaftLogWorker:430 -
172.20.70.23_40010@group-000100000001-SegmentedRaftLogWorker: Rolling segment
log-1395_1411 to index:1411
2022-08-16 15:25:44,247 [172.20.70.23_40010-server-thread2] INFO
o.a.r.s.i.RaftServerImpl:1475 - 172.20.70.23_40010@group-000100000001: Failed
appendEntries as the first entry (index 1394) already exists (snapshotIndex:
-1, commitIndex: 1403)
2022-08-16 15:25:44,248 [172.20.70.23_40010-server-thread2] INFO
o.a.r.s.i.RaftServerImpl:1455 - 172.20.70.23_40010@group-000100000001:
inconsistency entries.
Reply:172.20.70.24_40010<-172.20.70.23_40010#2980:FAIL-t1,INCONSISTENCY,nextIndex=1404,followerCommit=1403,matchIndex=-1
*Meanwhile, the leader keeps reporting changing this follower's nextIndex*
2022-08-16 15:25:44,612 [grpc-default-executor-2] INFO
o.a.r.s.i.FollowerInfoImpl:48 -
172.20.70.24_40010@group-000100000001->172.20.70.23_40010: nextIndex:
updateUnconditionally 1403 -> 1403
2022-08-16 15:25:44,649 [grpc-default-executor-2] INFO
o.a.r.s.i.FollowerInfoImpl:48 -
172.20.70.24_40010@group-000100000001->172.20.70.23_40010: nextIndex:
updateUnconditionally 1405 -> 1403
{*}{color:#ff0000}I looked back at previous directOOM logs and discovered this
similar log pattern. Since these "inconsistent AppendEntries" are sent from
leader almost with 0 waiting time (according to follower reply timestamp), I
guess directOOM may related to continuous Leader "inconsistent AppendEntries",
which consumes lots of direct memory for network transimission.{color}{*}
*Through, I'm confused why a follower will report inconsistent from time to
time while still can successfully append logs between these "inconsistent
AppendEntries". There is no obvious network congestion. However, I've set
RaftLog forceFlush to false. {color:#172b4d}I'm not sure whether this async
disk flush strategy is the cause for above abnormalities.{color}*
*{color:#172b4d}I'll be grateful if anyone can help me with this issue. Thanks
in advance!{color}*
> Frequent inconsistency entries during normal operations
> -------------------------------------------------------
>
> Key: RATIS-1674
> URL: https://issues.apache.org/jira/browse/RATIS-1674
> Project: Ratis
> Issue Type: Bug
> Reporter: Song Ziyang
> Priority: Major
>
> *After grpc 1.48.1 release, we packaged ratis with master branch and
> thirdparty 1.0.2 and test whether out of direct memory issue is fixed.
> Unfortunately, this error is again reproduced.*
> *See the error stack:*
> 2022-08-16 15:28:45,962
> [172.20.70.24_40010@group-000100000001->172.20.70.23_40010-GrpcLogAppender-LogAppenderDaemon]
> ERROR o.a.r.s.l.LogAppenderDaemon:86 -
> 172.20.70.24_40010@group-000100000001->172.20.70.23_40010-GrpcLogAppender-LogAppenderDaemon
> failed
> org.apache.ratis.thirdparty.io.netty.util.internal.OutOfDirectMemoryError:
> failed to allocate 2097152 byte(s) of direct memory (used: 17177772311, max:
> 17179869184)
> at
> org.apache.ratis.thirdparty.io.netty.util.internal.PlatformDependent.incrementMemoryCounter(PlatformDependent.java:806)
> at
> org.apache.ratis.thirdparty.io.netty.util.internal.PlatformDependent.allocateDirectNoCleaner(PlatformDependent.java:735)
> at
> org.apache.ratis.thirdparty.io.netty.buffer.PoolArena$DirectArena.allocateDirect(PoolArena.java:649)
> at
> org.apache.ratis.thirdparty.io.netty.buffer.PoolArena$DirectArena.newChunk(PoolArena.java:624)
> at
> org.apache.ratis.thirdparty.io.netty.buffer.PoolArena.allocateNormal(PoolArena.java:203)
> at
> org.apache.ratis.thirdparty.io.netty.buffer.PoolArena.tcacheAllocateNormal(PoolArena.java:187)
> at
> org.apache.ratis.thirdparty.io.netty.buffer.PoolArena.allocate(PoolArena.java:136)
> at
> org.apache.ratis.thirdparty.io.netty.buffer.PoolArena.allocate(PoolArena.java:126)
> at
> org.apache.ratis.thirdparty.io.netty.buffer.PooledByteBufAllocator.newDirectBuffer(PooledByteBufAllocator.java:396)
> at
> org.apache.ratis.thirdparty.io.netty.buffer.AbstractByteBufAllocator.directBuffer(AbstractByteBufAllocator.java:188)
> at
> org.apache.ratis.thirdparty.io.netty.buffer.AbstractByteBufAllocator.buffer(AbstractByteBufAllocator.java:124)
> at
> org.apache.ratis.thirdparty.io.grpc.netty.NettyWritableBufferAllocator.allocate(NettyWritableBufferAllocator.java:51)
> at
> org.apache.ratis.thirdparty.io.grpc.internal.MessageFramer.writeRaw(MessageFramer.java:285)
> at
> org.apache.ratis.thirdparty.io.grpc.internal.MessageFramer.access$400(MessageFramer.java:43)
> at
> org.apache.ratis.thirdparty.io.grpc.internal.MessageFramer$OutputStreamAdapter.write(MessageFramer.java:375)
> at
> org.apache.ratis.thirdparty.com.google.protobuf.CodedOutputStream$OutputStreamEncoder.write(CodedOutputStream.java:3005)
> at
> org.apache.ratis.thirdparty.com.google.protobuf.CodedOutputStream$OutputStreamEncoder.writeLazy(CodedOutputStream.java:3013)
> at
> org.apache.ratis.thirdparty.com.google.protobuf.ByteString$LiteralByteString.writeTo(ByteString.java:1411)
> at
> org.apache.ratis.thirdparty.com.google.protobuf.CodedOutputStream$OutputStreamEncoder.writeBytesNoTag(CodedOutputStream.java:2801)
> at
> org.apache.ratis.thirdparty.com.google.protobuf.CodedOutputStream$OutputStreamEncoder.writeBytes(CodedOutputStream.java:2775)
> at
> org.apache.ratis.proto.RaftProtos$StateMachineLogEntryProto.writeTo(RaftProtos.java:7869)
> at
> org.apache.ratis.thirdparty.com.google.protobuf.CodedOutputStream$OutputStreamEncoder.writeMessageNoTag(CodedOutputStream.java:2855)
> at
> org.apache.ratis.thirdparty.com.google.protobuf.CodedOutputStream$OutputStreamEncoder.writeMessage(CodedOutputStream.java:2824)
> at
> org.apache.ratis.proto.RaftProtos$LogEntryProto.writeTo(RaftProtos.java:9503)
> at
> org.apache.ratis.thirdparty.com.google.protobuf.CodedOutputStream$OutputStreamEncoder.writeMessageNoTag(CodedOutputStream.java:2855)
> at
> org.apache.ratis.thirdparty.com.google.protobuf.CodedOutputStream$OutputStreamEncoder.writeMessage(CodedOutputStream.java:2824)
> at
> org.apache.ratis.proto.RaftProtos$AppendEntriesRequestProto.writeTo(RaftProtos.java:17799)
> at
> org.apache.ratis.thirdparty.com.google.protobuf.AbstractMessageLite.writeTo(AbstractMessageLite.java:83)
> at
> org.apache.ratis.thirdparty.io.grpc.protobuf.lite.ProtoInputStream.drainTo(ProtoInputStream.java:52)
> at
> org.apache.ratis.thirdparty.io.grpc.internal.MessageFramer.writeToOutputStream(MessageFramer.java:267)
> at
> org.apache.ratis.thirdparty.io.grpc.internal.MessageFramer.writeKnownLengthUncompressed(MessageFramer.java:229)
> at
> org.apache.ratis.thirdparty.io.grpc.internal.MessageFramer.writeUncompressed(MessageFramer.java:168)
> at
> org.apache.ratis.thirdparty.io.grpc.internal.MessageFramer.writePayload(MessageFramer.java:141)
> at
> org.apache.ratis.thirdparty.io.grpc.internal.AbstractStream.writeMessage(AbstractStream.java:65)
> at
> org.apache.ratis.thirdparty.io.grpc.internal.ForwardingClientStream.writeMessage(ForwardingClientStream.java:37)
> at
> org.apache.ratis.thirdparty.io.grpc.internal.RetriableStream.sendMessage(RetriableStream.java:545)
> at
> org.apache.ratis.thirdparty.io.grpc.internal.ClientCallImpl.sendMessageInternal(ClientCallImpl.java:520)
> at
> org.apache.ratis.thirdparty.io.grpc.internal.ClientCallImpl.sendMessage(ClientCallImpl.java:506)
> at
> org.apache.ratis.thirdparty.io.grpc.stub.ClientCalls$CallToStreamObserverAdapter.onNext(ClientCalls.java:374)
> at
> org.apache.ratis.grpc.server.GrpcLogAppender$StreamObservers.onNext(GrpcLogAppender.java:236)
> at
> org.apache.ratis.grpc.server.GrpcLogAppender.lambda$sendRequest$1(GrpcLogAppender.java:285)
> at java.util.Optional.map(Optional.java:215)
> at
> org.apache.ratis.grpc.server.GrpcLogAppender.sendRequest(GrpcLogAppender.java:284)
> at
> org.apache.ratis.grpc.server.GrpcLogAppender.appendLog(GrpcLogAppender.java:276)
> at
> org.apache.ratis.grpc.server.GrpcLogAppender.run(GrpcLogAppender.java:160)
> at
> org.apache.ratis.server.leader.LogAppenderDaemon.run(LogAppenderDaemon.java:77)
> at java.lang.Thread.run(Thread.java:748)
> 2022-08-16 15:28:45,963 [grpc-default-executor-2] WARN
> o.a.ratis.util.LogUtils:122 -
> 172.20.70.24_40010@group-000100000001->172.20.70.23_40010-AppendLogResponseHandler:
> Failed appendEntries:
> org.apache.ratis.thirdparty.io.grpc.StatusRuntimeException: CANCELLED: Client
> sendMessage() failed with Error
> 2022-08-16 15:28:45,963
> [172.20.70.24_40010@group-000100000001->172.20.70.23_40010-GrpcLogAppender-LogAppenderDaemon]
> INFO o.a.r.s.i.LeaderStateImpl:531 -
> 172.20.70.24_40010@group-000100000001-LeaderStateImpl: Restarting
> GrpcLogAppender for 172.20.70.24_40010@group-000100000001->172.20.70.23_40010
>
> {color:#ff0000}*However, we discover some other abnormalities.* {color}
> *That is, one follower often report that it receives inconsistent
> AppendEntries from leader as the first entry in AE already exists locally.
> After some complaining on "inconsistent appendEntry", this follower can still
> write logs to RaftLog from time to time. The "inconsistent AE" and "success
> log write" are interleaved. See follower log:*
> 2022-08-16 15:25:43,253
> [172.20.70.23_40010@group-000100000001-SegmentedRaftLogWorker] INFO
> o.a.r.s.r.s.SegmentedRaftLogWorker$StartLogSegment:629 -
> 172.20.70.23_40010@group-000100000001-SegmentedRaftLogWorker: created new log
> segment
> /data/cluster/first-rest-test/DataNode/apache-iotdb/datanode/sbin/../data/consensus/data_region/47474747-4747-4747-4747-000100000001/current/log_inprogress_1376
> 2022-08-16 15:25:43,345 [172.20.70.23_40010-server-thread2] INFO
> o.a.r.s.i.RaftServerImpl:1475 - 172.20.70.23_40010@group-000100000001: Failed
> appendEntries as the first entry (index 1283) already exists (snapshotIndex:
> -1, commitIndex: 1393)
> 2022-08-16 15:25:43,345 [172.20.70.23_40010-server-thread2] INFO
> o.a.r.s.i.RaftServerImpl:1455 - 172.20.70.23_40010@group-000100000001:
> inconsistency entries.
> Reply:172.20.70.24_40010<-172.20.70.23_40010#2960:FAIL-t1,INCONSISTENCY,nextIndex=1394,followerCommit=1393,matchIndex=-1
> 2022-08-16 15:25:43,358 [172.20.70.23_40010-server-thread2] INFO
> o.a.r.s.i.RaftServerImpl:1475 - 172.20.70.23_40010@group-000100000001: Failed
> appendEntries as the first entry (index 1287) already exists (snapshotIndex:
> -1, commitIndex: 1393)
> 2022-08-16 15:25:43,359 [172.20.70.23_40010-server-thread2] INFO
> o.a.r.s.i.RaftServerImpl:1455 - 172.20.70.23_40010@group-000100000001:
> inconsistency entries.
> Reply:172.20.70.24_40010<-172.20.70.23_40010#2961:FAIL-t1,INCONSISTENCY,nextIndex=1394,followerCommit=1393,matchIndex=-1
> 2022-08-16 15:25:43,374 [172.20.70.23_40010-server-thread2] INFO
> o.a.r.s.i.RaftServerImpl:1475 - 172.20.70.23_40010@group-000100000001: Failed
> appendEntries as the first entry (index 1290) already exists (snapshotIndex:
> -1, commitIndex: 1393)
> 2022-08-16 15:25:43,374 [172.20.70.23_40010-server-thread2] INFO
> o.a.r.s.i.RaftServerImpl:1455 - 172.20.70.23_40010@group-000100000001:
> inconsistency entries.
> Reply:172.20.70.24_40010<-172.20.70.23_40010#2962:FAIL-t1,INCONSISTENCY,nextIndex=1394,followerCommit=1393,matchIndex=-1
> 2022-08-16 15:25:43,387 [172.20.70.23_40010-server-thread2] INFO
> o.a.r.s.i.RaftServerImpl:1475 - 172.20.70.23_40010@group-000100000001: Failed
> appendEntries as the first entry (index 1294) already exists (snapshotIndex:
> -1, commitIndex: 1393)
> 2022-08-16 15:25:43,387 [172.20.70.23_40010-server-thread2] INFO
> o.a.r.s.i.RaftServerImpl:1455 - 172.20.70.23_40010@group-000100000001:
> inconsistency entries.
> Reply:172.20.70.24_40010<-172.20.70.23_40010#2963:FAIL-t1,INCONSISTENCY,nextIndex=1394,followerCommit=1393,matchIndex=-1
> 2022-08-16 15:25:43,983 [172.20.70.23_40010-server-thread2] INFO
> o.a.r.s.i.RaftServerImpl:1475 - 172.20.70.23_40010@group-000100000001: Failed
> appendEntries as the first entry (index 1297) already exists (snapshotIndex:
> -1, commitIndex: 1393)
> 2022-08-16 15:25:43,984 [172.20.70.23_40010-server-thread2] INFO
> o.a.r.s.i.RaftServerImpl:1455 - 172.20.70.23_40010@group-000100000001:
> inconsistency entries.
> Reply:172.20.70.24_40010<-172.20.70.23_40010#2964:FAIL-t1,INCONSISTENCY,nextIndex=1394,followerCommit=1393,matchIndex=-1
> {color:#0747a6}(successfully write after some inconsistency AE){color}
> {color:#0747a6}2022-08-16 15:25:44,011 [172.20.70.23_40010-server-thread2]
> INFO o.a.r.s.r.s.SegmentedRaftLogWorker:430 -
> 172.20.70.23_40010@group-000100000001-SegmentedRaftLogWorker: Rolling segment
> log-1376_1394 to index:1394{color}
> {color:#0747a6}2022-08-16 15:25:44,017
> [172.20.70.23_40010@group-000100000001-SegmentedRaftLogWorker] INFO
> o.a.r.s.r.s.SegmentedRaftLogWorker$FinalizeLogSegment:586 -
> 172.20.70.23_40010@group-000100000001-SegmentedRaftLogWorker: Rolled log
> segment from
> /data/cluster/first-rest-test/DataNode/apache-iotdb/datanode/sbin/../data/consensus/data_region/47474747-4747-4747-4747-000100000001/current/log_inprogress_1376
> to
> /data/cluster/first-rest-test/DataNode/apache-iotdb/datanode/sbin/../data/consensus/data_region/47474747-4747-4747-4747-000100000001/current/log_1376-1394{color}
> {color:#0747a6}2022-08-16 15:25:44,028
> [172.20.70.23_40010@group-000100000001-SegmentedRaftLogWorker] INFO
> o.a.r.s.r.s.SegmentedRaftLogWorker$StartLogSegment:629 -
> 172.20.70.23_40010@group-000100000001-SegmentedRaftLogWorker: created new log
> segment
> /data/cluster/first-rest-test/DataNode/apache-iotdb/datanode/sbin/../data/consensus/data_region/47474747-4747-4747-4747-000100000001/current/log_inprogress_1395{color}
> 2022-08-16 15:25:44,137 [172.20.70.23_40010-server-thread2] INFO
> o.a.r.s.i.RaftServerImpl:1475 - 172.20.70.23_40010@group-000100000001: Failed
> appendEntries as the first entry (index 1394) already exists (snapshotIndex:
> -1, commitIndex: 1395)
> 2022-08-16 15:25:44,137 [172.20.70.23_40010-server-thread2] INFO
> o.a.r.s.i.RaftServerImpl:1455 - 172.20.70.23_40010@group-000100000001:
> inconsistency entries.
> Reply:172.20.70.24_40010<-172.20.70.23_40010#2966:FAIL-t1,INCONSISTENCY,nextIndex=1396,followerCommit=1395,matchIndex=-1
> 2022-08-16 15:25:44,158 [172.20.70.23_40010-server-thread2] INFO
> o.a.r.s.i.RaftServerImpl:1475 - 172.20.70.23_40010@group-000100000001: Failed
> appendEntries as the first entry (index 1394) already exists (snapshotIndex:
> -1, commitIndex: 1395)
> 2022-08-16 15:25:44,158 [172.20.70.23_40010-server-thread2] INFO
> o.a.r.s.i.RaftServerImpl:1455 - 172.20.70.23_40010@group-000100000001:
> inconsistency entries.
> Reply:172.20.70.24_40010<-172.20.70.23_40010#2967:FAIL-t1,INCONSISTENCY,nextIndex=1396,followerCommit=1395,matchIndex=-1
> 2022-08-16 15:25:44,229 [172.20.70.23_40010-server-thread2] INFO
> o.a.r.s.r.s.SegmentedRaftLogWorker:430 -
> 172.20.70.23_40010@group-000100000001-SegmentedRaftLogWorker: Rolling segment
> log-1395_1411 to index:1411
> 2022-08-16 15:25:44,247 [172.20.70.23_40010-server-thread2] INFO
> o.a.r.s.i.RaftServerImpl:1475 - 172.20.70.23_40010@group-000100000001: Failed
> appendEntries as the first entry (index 1394) already exists (snapshotIndex:
> -1, commitIndex: 1403)
> 2022-08-16 15:25:44,248 [172.20.70.23_40010-server-thread2] INFO
> o.a.r.s.i.RaftServerImpl:1455 - 172.20.70.23_40010@group-000100000001:
> inconsistency entries.
> Reply:172.20.70.24_40010<-172.20.70.23_40010#2980:FAIL-t1,INCONSISTENCY,nextIndex=1404,followerCommit=1403,matchIndex=-1
>
> *Meanwhile, the leader keeps reporting changing this follower's nextIndex*
> 2022-08-16 15:25:44,612 [grpc-default-executor-2] INFO
> o.a.r.s.i.FollowerInfoImpl:48 -
> 172.20.70.24_40010@group-000100000001->172.20.70.23_40010: nextIndex:
> updateUnconditionally 1403 -> 1403
> 2022-08-16 15:25:44,649 [grpc-default-executor-2] INFO
> o.a.r.s.i.FollowerInfoImpl:48 -
> 172.20.70.24_40010@group-000100000001->172.20.70.23_40010: nextIndex:
> updateUnconditionally 1405 -> 1403
>
> *{color:#ff0000}I looked back at previous directOOM logs and discovered this
> similar log pattern. Since these "inconsistent AppendEntries" are sent from
> leader almost with 0 waiting time (according to follower reply timestamp), I
> guess directOOM may related to continuous Leader "inconsistent
> AppendEntries", which consumes lots of direct memory for network
> transimission.{color}*
> {*}Through, I'm confused why a follower will report inconsistent from time to
> time while still can successfully append logs between these "inconsistent
> AppendEntries"{*}{*}, why leader keeps sending “inconsistent AE" with zero
> waiting time{*}{*}. There is no obvious network congestion.{*}
> *FYI, I've set RaftLog forceFlush to false. {color:#172b4d}I'm not sure
> whether this async disk flush strategy is the cause for above
> abnormalities.{color}*
> *{color:#172b4d}I'll be grateful if anyone can help me with this issue.
> Thanks in advance!{color}*
>
>
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