Home > Others

Neo4j Problem Series-JVM

Source: Internet
Author: User
Developer on Alibaba Coud: Build your first app with APIs, SDKs, and tutorials on the Alibaba Cloud. Read more ＞

The system of a project has gone wrong, early in the morning the engineer sent over the problem log and,
The problem is very strange, find the source code of NEO4J, in the code: Channelpool = new Resourcepool<triplet<channel, Channelbuffer, bytebuffer>> ( Maxunusedchannels,
New ResourcePool.CheckStrategy.TimeoutCheckStrategy (Resourcepool.default_check_interval,
Clock.real_clock),
New Loggingresourcepoolmonitor (Msglog))
{
@Override
Protected Triplet<channel, Channelbuffer, bytebuffer> Create ()
{
Channelfuture channelfuture = bootstrap.connect (address);
channelfuture.awaituninterruptibly (5, timeunit.seconds);
Triplet<channel, Channelbuffer, bytebuffer> Channel = null;
if (channelfuture.issuccess ())
{
Channel = Triplet.of (Channelfuture.getchannel (),
Channelbuffers.dynamicbuffer (),
Bytebuffer.allocate (1024 * 1024));
Msglog.logmessage ("opened a new channel to" + address, true);
return channel;
}

String msg = Client.this.getClass (). Getsimplename () + "Could not connect to" + address;
Msglog.logmessage (msg, true);
COMException exception = new COMException (msg);
Connectionlosthandler.handle (Exception);
Throw exception;
}
The Red Word section is the NEO4J cluster timeout detection strategy, where the code to write dead is 5 seconds to connect once, if you do not get the results will not connect to other nodes. Combine the GC logs of the JVM:
838848.0 838848.0 393256.3 0.0 6710912.0 4034318.3 2477168.0 1260112.9 262144.0 93696.5 280 144.570 53 100.630 245.201
838848.0 838848.0 393256.3 0.0 6710912.0 4047794.2 2477168.0 1260112.9 262144.0 93696.5 280 144.570 53 100.630 245.201
838848.0 838848.0 393256.3 0.0 6710912.0 4065917.6 2477168.0 1260112.9 262144.0 93696.5 280 144.570 53 100.630 245.201
838848.0 838848.0 393256.3 0.0 6710912.0 4096465.2 2477168.0 1260112.9 262144.0 93696.5 280 144.570 53 100.630 245.201
838848.0 838848.0 393256.3 0.0 6710912.0 4109666.1 2477168.0 1260112.9 262144.0 93696.5 280 144.570 53 100.630 245.201
838848.0 838848.0 393256.3 0.0 6710912.0 4122958.8 2477168.0 1260112.9 262144.0 93696.5 280 144.570 53 100.630 245.201
838848.0 838848.0 393256.3 0.0 6710912.0 4140524.4 2477168.0 1260112.9 262144.0 93696.5 280 144.570 53 100.630 245.201
838848.0 838848.0 393256.3 0.0 6710912.0 4153747.1 2477168.0 1260112.9 262144.0 93696.5 280 144.570 53 100.630 245.201
838848.0 838848.0 393256.3 0.0 6710912.0 4192433.5 2477168.0 1260112.9 262144.0 93696.5 280 144.570 53 100.630 245.201
838848.0 838848.0 393256.3 0.0 6710912.0 4209845.7 2477168.0 1260112.9 262144.0 93696.5 280 144.570 53 100.630 245.201
838848.0 838848.0 393256.3 0.0 6710912.0 4222981.6 2477168.0 1260112.9 262144.0 93696.5 280 144.570 53 100.630 245.201
838848.0 838848.0 393256.3 0.0 6710912.0 4236453.5 2477168.0 1260112.9 262144.0 93696.5 280 144.570 53 100.630 245.201
838848.0 838848.0 393256.3 0.0 6710912.0 4249570.1 2477168.0 1260112.9 262144.0 93696.5 280 144.570 53 100.630 245.201
838848.0 838848.0 393256.3 0.0 6710912.0 4262667.9 2477168.0 1260112.9 262144.0 93696.5 280 144.570 53 100.630 245.201
838848.0 838848.0 393256.3 0.0 6710912.0 4275803.3 2477168.0 1260112.9 262144.0 93696.5 280 144.570 53 100.630 245.201
838848.0 838848.0 393256.3 0.0 6710912.0 4302302.3 2477168.0 1260112.9 262144.0 93696.5 280 144.570 53 100.630 245.201
838848.0 838848.0 393256.3 0.0 6710912.0 4315451.5 2477168.0 1260112.9 262144.0 93696.5 280 144.570 53 100.630 245.201
838848.0 838848.0 393256.3 0.0 6710912.0 4328642.9 2477168.0 1260112.9 262144.0 93696.5 280 144.570 53 100.630 245.201
838848.0 838848.0 393256.3 0.0 6710912.0 4341828.1 2477168.0 1260112.9 262144.0 93696.5 280 144.570 53 100.630 245.201
838848.0 838848.0 393256.3 0.0 6710912.0 4368032.2 2477168.0 1260112.9 262144.0 93696.5 280 144.570 53 100.630 245.201
838848.0 838848.0 393256.3 0.0 6710912.0 4381214.7 2477168.0 1260112.9 262144.0 93696.5 280 144.570 53 100.630 245.201
838848.0 838848.0 393256.3 0.0 6710912.0 4394387.5 2477168.0 1260112.9 262144.0 93696.5 280 144.570 53 100.630 245.201
838848.0 838848.0 393256.3 0.0 6710912.0 4407574.8 2477168.0 1260112.9 262144.0 93696.5 280 144.570 53 100.630 245.201
838848.0 838848.0 393256.3 0.0 6710912.0 4433785.8 2477168.0 1260112.9 262144.0 93696.5 280 144.570 53 100.630 245.201
838848.0 838848.0 393256.3 0.0 6710912.0 4446897.6 2477168.0 1260112.9 262144.0 93696.5 280 144.570 53 100.630 245.201
838848.0 838848.0 393256.3 0.0 6710912.0 4460088.9 2477168.0 1260112.9 262144.0 93696.5 280 144.570 53 100.630 245.201
838848.0 838848.0 393256.3 0.0 6710912.0 4473219.6 2477168.0 1260112.9 262144.0 93696.5 280 144.570 53 100.630 245.201
838848.0 838848.0 393256.3 0.0 6710912.0 4486337.2 2477168.0 1260112.9 262144.0 93696.5 280 144.570 53 100.630 245.201
838848.0 838848.0 393256.3 0.0 6710912.0 4499552.5 2477168.0 1260112.9 262144.0 93696.5 280 144.570 53 100.630 245.201
838848.0 838848.0 393256.3 0.0 6710912.0 4512696.3 2477168.0 1260112.9 262144.0 93696.5 280 144.570 53 100.630 245.201
838848.0 838848.0 393256.3 0.0 6710912.0 4512833.1 2477168.0 1260112.9 262144.0 93696.5 280 144.570 53 100.630 245.201
838848.0 838848.0 393256.3 0.0 6710912.0 4525992.0 2477168.0 1260112.9 262144.0 93696.5 280 144.570 53 100.630 245.201
838848.0 838848.0 393256.3 0.0 6710912.0 4539110.7 2477168.0 1260112.9 262144.0 93696.5 280 144.570 53 100.630 245.201
838848.0 838848.0 393256.3 0.0 6710912.0 4552214.6 2477168.0 1260112.9 262144.0 93696.5 280 144.570 53 100.630 245.201
838848.0 838848.0 393256.3 0.0 6710912.0 4552286.2 2477168.0 1260112.9 262144.0 93696.5 280 144.570 53 100.630 245.201
838848.0 838848.0 393256.3 0.0 6710912.0 4565467.4 2477168.0 1260112.9 262144.0 93696.5 280 144.570 53 100.630 245.201
838848.0 838848.0 393256.3 0.0 6710912.0 4578656.7 2477168.0 1260112.9 262144.0 93696.5 280 144.570 53 100.630 245.201
838848.0 838848.0 393256.3 0.0 6710912.0 4578760.3 2477168.0 1260112.9 262144.0 93696.5 280 144.570 53 100.630 245.201
838848.0 838848.0 393256.3 0.0 6710912.0 4592102.7 2477168.0 1260112.9 262144.0 93696.5 280 144.570 53 100.630 245.201
838848.0 838848.0 393256.3 0.0 6710912.0 4614557.1 2477168.0 1260112.9 262144.0 93696.5 280 144.570 53 100.630 245.201
838848.0 838848.0 393256.3 0.0 6710912.0 4643717.6 2477168.0 1260112.9 262144.0 93696.5 280 144.570 53 100.630 245.201
838848.0 838848.0 393256.3 0.0 6710912.0 4703662.3 2477168.0 1260112.9 262144.0 93696.5 280 144.570 53 100.630 245.201
838848.0 838848.0 393256.3 0.0 6710912.0 4781383.2 2477168.0 1260112.9 262144.0 93696.5 280 144.570 53 100.630 245.201
838848.0 838848.0 393256.3 0.0 6710912.0 4874863.2 2477168.0 1260112.9 262144.0 93696.5 280 144.570 53 100.630 245.201
838848.0 838848.0 393256.3 0.0 6710912.0 4956980.7 2477168.0 1260112.9 262144.0 93696.5 280 144.570 53 100.630 245.201
838848.0 838848.0 393256.3 0.0 6710912.0 5021316.2 2477168.0 1260112.9 262144.0 93696.5 280 144.570 53 100.630 245.201
838848.0 838848.0 393256.3 0.0 6710912.0 5082403.3 2477168.0 1260112.9 262144.0 93696.5 280 144.570 53 100.630 245.201
838848.0 838848.0 393256.3 0.0 6710912.0 5186498.6 2477168.0 1260112.9 262144.0 93696.5 280 144.570 53 100.630 245.201
838848.0 838848.0 393256.3 0.0 6710912.0 5272571.1 2477168.0 1260112.9 262144.0 93696.5 280 144.570 53 100.630 245.201
838848.0 838848.0 393256.3 0.0 6710912.0 5336442.5 2477168.0 1260112.9 262144.0 93696.5 280 144.570 53 100.630 245.201
838848.0 838848.0 393256.3 0.0 6710912.0 5435527.4 2477168.0 1260112.9 262144.0 93696.5 280 144.570 53 100.630 245.201
838848.0 838848.0 393256.3 0.0 6710912.0 5522161.0 2477168.0 1260112.9 262144.0 93696.5 280 144.570 53 100.630 245.201
838848.0 838848.0 393256.3 0.0 6710912.0 5628996.2 2477168.0 1260112.9 262144.0 93696.5 280 144.570 53 100.630 245.201
838848.0 838848.0 393256.3 0.0 6710912.0 5671821.6 2477168.0 1260112.9 262144.0 93696.5 280 144.570 53 100.630 245.201
838848.0 838848.0 393256.3 0.0 6710912.0 5710974.3 2477168.0 1260112.9 262144.0 93696.5 280 144.570 53 100.630 245.201
838848.0 838848.0 393256.3 0.0 6710912.0 5763211.6 2477168.0 1260112.9 262144.0 93696.5 280 144.570 53 100.630 245.201
838848.0 838848.0 393256.3 0.0 6710912.0 5824083.4 2477168.0 1260112.9 262144.0 93696.5 280 144.570 53 100.630 245.201
838848.0 838848.0 393256.3 0.0 6710912.0 5880336.7 2477168.0 1260112.9 262144.0 93696.5 280 144.570 53 100.630 245.201
838848.0 838848.0 393256.3 0.0 6710912.0 5911785.0 2477168.0 1260112.9 262144.0 93696.5 280 144.570 53 100.630 245.201
838848.0 838848.0 393256.3 0.0 6710912.0 5924983.1 2477168.0 1260112.9 262144.0 93696.5 280 144.570 53 100.630 245.201
838848.0 838848.0 393256.3 0.0 6710912.0 5938083.0 2477168.0 1260112.9 262144.0 93696.5 280 144.570 53 100.630 245.201
838848.0 838848.0 393256.3 0.0 6710912.0 5956058.5 2477168.0 1260112.9 262144.0 93696.5 280 144.570 53 100.630 245.201
838848.0 838848.0 393256.3 0.0 6710912.0 5970411.9 2477168.0 1260112.9 262144.0 93696.5 280 144.570 53 100.630 245.201
838848.0 838848.0 393256.3 0.0 6710912.0 5987960.0 2477168.0 1260112.9 262144.0 93696.5 280 144.570 53 100.630 245.201
838848.0 838848.0 393256.3 0.0 6710912.0 6001154.8 2477168.0 1260112.9 262144.0 93696.5 280 144.570 53 100.630 245.201
838848.0 838848.0 393256.3 0.0 6710912.0 6018323.2 2477168.0 1260112.9 262144.0 93696.5 280 144.570 53 100.630 245.201
838848.0 838848.0 393256.3 0.0 6710912.0 6031721.3 2477168.0 1260112.9 262144.0 93696.5 280 144.570 53 100.630 245.201
838848.0 838848.0 393256.3 0.0 6710912.0 6049252.8 2477168.0 1260112.9 262144.0 93696.5 280 144.570 53 100.630 245.201
838848.0 838848.0 393256.3 0.0 6710912.0 6066716.6 2477168.0 1260112.9 262144.0 93696.5 280 144.570 53 100.630 245.201
838848.0 838848.0 393256.3 0.0 6710912.0 6079821.6 2477168.0 1260112.9 262144.0 93696.5 280 144.570 53 100.630 245.201
838848.0 838848.0 393256.3 0.0 6710912.0 6079900.0 2477168.0 1260112.9 262144.0 93696.5 280 144.570 53 100.630 245.201
838848.0 838848.0 393256.3 0.0 6710912.0 6097365.6 2477168.0 1260112.9 262144.0 93696.5 280 144.570 53 100.630 245.201
838848.0 838848.0 393256.3 0.0 6710912.0 6110549.5 2477168.0 1260112.9 262144.0 93696.5 280 144.570 53 100.630 245.201
838848.0 838848.0 393256.3 0.0 6710912.0 6123648.3 2477168.0 1260112.9 262144.0 93696.5 280 144.570 53 100.630 245.201
838848.0 838848.0 393256.3 0.0 6710912.0 6136783.9 2477168.0 1260112.9 262144.0 93696.5 280 144.570 53 100.630 245.201
838848.0 838848.0 393256.3 0.0 6710912.0 6150179.5 2477168.0 1260112.9 262144.0 93696.5 280 144.570 53 100.630 245.201
838848.0 838848.0 393256.3 0.0 6710912.0 6163355.0 2477168.0 1260112.9 262144.0 93696.5 280 144.570 53 100.630 245.201
838848.0 838848.0 393256.3 0.0 6710912.0 6176542.7 2477168.0 1260112.9 262144.0 93696.5 280 144.570 53 100.630 245.201
838848.0 838848.0 393256.3 0.0 6710912.0 6189712.3 2477168.0 1260112.9 262144.0 93696.5 280 144.570 53 100.630 245.201
838848.0 838848.0 393256.3 0.0 6710912.0 6202824.4 2477168.0 1260112.9 262144.0 93696.5 280 144.570 53 100.630 245.201
838848.0 838848.0 393256.3 0.0 6710912.0 6216032.0 2477168.0 1260112.9 262144.0 93696.5 280 144.570 53 100.630 245.201
838848.0 838848.0 393256.3 0.0 6710912.0 6229178.0 2477168.0 1260112.9 262144.0 93696.5 280 144.570 53 100.630 245.201
838848.0 838848.0 393256.3 0.0 6710912.0 6242382.4 2477168.0 1260112.9 262144.0 93696.5 280 144.570 53 100.630 245.201
838848.0 838848.0 393256.3 0.0 6710912.0 6255490.9 2477168.0 1260112.9 262144.0 93696.5 280 144.570 53 100.630 245.201
838848.0 838848.0 393256.3 0.0 6710912.0 6268600.8 2477168.0 1260112.9 262144.0 93696.5 280 144.570 53 100.630 245.201
838848.0 838848.0 393256.3 0.0 6710912.0 6281767.4 2477168.0 1260112.9 262144.0 93696.5 280 144.570 53 100.630 245.201
838848.0 838848.0 393256.3 0.0 6710912.0 6294983.6 2477168.0 1260112.9 262144.0 93696.5 280 144.570 53 100.630 245.201
838848.0 838848.0 393256.3 0.0 6710912.0 6308106.2 2477168.0 1260112.9 262144.0 93696.5 280 144.570 53 100.630 245.201
838848.0 838848.0 393256.3 0.0 6710912.0 6321249.9 2477168.0 1260112.9 262144.0 93696.5 280 144.570 53 100.630 245.201
838848.0 838848.0 393256.3 0.0 6710912.0 6334388.5 2477168.0 1260112.9 262144.0 93696.5 280 144.570 53 100.630 245.201
838848.0 838848.0 393256.3 0.0 6710912.0 6347509.3 2477168.0 1260112.9 262144.0 93696.5 280 144.570 53 100.630 245.201
838848.0 838848.0 393256.3 0.0 6710912.0 6360783.6 2477168.0 1260112.9 262144.0 93696.5 280 144.570 53 100.630 245.201
838848.0 838848.0 393256.3 0.0 6710912.0 6373907.9 2477168.0 1260112.9 262144.0 93696.5 280 144.570 53 100.630 245.201
838848.0 838848.0 393256.3 0.0 6710912.0 6387005.7 2477168.0 1260112.9 262144.0 93696.5 280 144.570 53 100.630 245.201
838848.0 838848.0 393256.3 0.0 6710912.0 6400119.1 2477168.0 1260112.9 262144.0 93696.5 280 144.570 53 100.630 245.201
838848.0 838848.0 393256.3 0.0 6710912.0 6413285.3 2477168.0 1260112.9 262144.0 93696.5 280 144.570 53 100.630 245.201
838848.0 838848.0 393256.3 0.0 6710912.0 6426462.7 2477168.0 1260112.9 262144.0 93696.5 280 144.570 53 100.630 245.201
838848.0 838848.0 393256.3 0.0 6710912.0 6439742.0 2477168.0 1260112.9 262144.0 93696.5 280 144.570 53 100.630 245.201
838848.0 838848.0 393256.3 0.0 6710912.0 6443932.0 2477168.0 1260112.9 262144.0 93696.5 280 144.570 53 100.630 245.201
838848.0 838848.0 393256.3 0.0 6710912.0 6504376.5 2477168.0 1260112.9 262144.0 93696.5 280 144.570 53 100.630 245.201

Basically locating as GC reclamation causes the business thread to stop responding resulting in timeouts, and it seems that there is too much data in the JVM to recycle. The problem is clear, then check the code.

Neo4j Problem Series-JVM

This article is an English version of an article which is originally in the Chinese language on aliyun.com and is provided for information purposes only. This website makes no representation or warranty of any kind, either expressed or implied, as to the accuracy, completeness ownership or reliability of the article or any translations thereof. If you have any concerns or complaints relating to the article, please send an email, providing a detailed description of the concern or complaint, to info-contact@alibabacloud.com. A staff member will contact you within 5 working days. Once verified, infringing content will be removed immediately.

Contact Us

The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion; products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the content of the page makes you feel confusing, please write us an email, we will handle the problem within 5 days after receiving your email.

If you find any instances of plagiarism from the community, please send an email to: info-contact@alibabacloud.com and provide relevant evidence. A staff member will contact you within 5 working days.

A Free Trial That Lets You Build Big!

Start building with 50+ products and up to 12 months usage for Elastic Compute Service

Get Started for Free

  • Sales Support

    1 on 1 presale consultation

    Chat Contact Sales

  • After-Sales Support

    24/7 Technical Support 6 Free Tickets per Quarter Faster Response

    Open a Ticket

  • Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.

    Learn More