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Knox Gateway down

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Contributor

Hi in my cluster knox gateway was down.i found one issue in knox-gc.log.

Please find the below error

2018-07-05T01:55:29.588+0000: 314055.583: [GC (Allocation Failure) 2018-07-05T01:55:29.887+0000: 314055.882: [ParNew: 2532112K->10894K(2831168K), 0.0440397 secs] 2532112K->10894K(2837312K), 0.3432294 secs] [Times: user=0.03 sys=0.00, real=0.35 secs]

Please help me how to solve

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@Felix Albani @Sindhu @Jay Kumar SenSharma @Geoffrey Shelton OkotHi,

knox gateway is going down on daily basis.i found only knox-gc.log with toaday's time stamp in /var/log/knox/ directory.

if you think that it is due to allocation failure can you please tell me how much memory i need to allocate for knox gateway.

in my gateway.sh file i found the below line.do i need to change the values here or any other place and please let me know how much memory i should give to resolve this issue.

APP_MEM_OPTS="-Xmx5g -XX:NewSize=3G -XX:MaxNewSize=3G -verbose:gc -XX:ParallelGCThreads=8 -XX:+UseConcMarkSweepGC -Xloggc:/var/log/knox/knox-gc.log -XX:+PrintGCDetails -XX:+PrintGCTimeStamps -XX:+PrintGCDateStamps"


Thanks in advance

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@kanna k

So based on the above logs you added I see

2018-07-10 09:55:07,592 ERROR hadoop.gateway (DefaultTopologyService.java:loadTopologies(252)) - Failed to load topology /usr/hdp/2.6.1.0-129/knox/bin/../conf/topologies/sample.xml: org.xml.sax.SAXParseException; lineNumber: 41; columnNumber: 76; The reference to entity "ServiceAccounts" must end with the ';' delimiter.

This error points to a sample.xml topology file which has errors. Perhaps you can move it out from topologies directory or fix the problem in the before mentioned line.

As far as memory I already provided the link to calculate the memory for Knox in previous post. But as I mentioned, unless you are seeing OOM exceptions I don't think you are having memory problems. I would suggest you check the logs and see what is causing the knox server to go down.

HTH

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Contributor

i found below information in gateway.log

can any one help me to resolve this...

2018-07-10 09:55:07,535 ERROR hadoop.gateway (DefaultTopologyService.java:loadTopology(111)) - Failed to load topology /usr/hdp/2.6.1.0-129/knox/bin/../conf/topologies/sample.xml, retrying after 50ms: org.xml.sax.SAXParseException; lineNumber: 41; columnNumber: 76; The reference to entity "ServiceAccounts" must end with the ';' delimiter.

2018-07-10 09:55:07,588 ERROR digester3.Digester (Digester.java:fatalError(1541)) - Parse Fatal Error at line 41 column 76: The reference to entity "ServiceAccounts" must end with the ';' delimiter.

org.xml.sax.SAXParseException; lineNumber: 41; columnNumber: 76; The reference to entity "ServiceAccounts" must end with the ';' delimiter.

at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.createSAXParseException(ErrorHandlerWrapper.java:203)

at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.fatalError(ErrorHandlerWrapper.java:177)

at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(XMLErrorReporter.java:441)

at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(XMLErrorReporter.java:368)

at com.sun.org.apache.xerces.internal.impl.XMLScanner.reportFatalError(XMLScanner.java:1437)

at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanEntityReference(XMLDocumentFragmentScannerImpl.java:1850)

at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl$FragmentContentDriver.next(XMLDocumentFragmentScannerImpl.java:3067)

at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(XMLDocumentScannerImpl.java:606)

at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(XMLDocumentFragmentScannerImpl.java:510)

at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:848)

at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:777)

at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(XMLParser.java:141)

at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(AbstractSAXParser.java:1213)

at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(SAXParserImpl.java:649)

at org.apache.commons.digester3.Digester.parse(Digester.java:1642)

at org.apache.commons.digester3.Digester.parse(Digester.java:1701)

at org.apache.hadoop.gateway.services.topology.impl.DefaultTopologyService.loadTopologyAttempt(DefaultTopologyService.java:124)

at org.apache.hadoop.gateway.services.topology.impl.DefaultTopologyService.loadTopology(DefaultTopologyService.java:100)

at org.apache.hadoop.gateway.services.topology.impl.DefaultTopologyService.loadTopologies(DefaultTopologyService.java:235)

at org.apache.hadoop.gateway.services.topology.impl.DefaultTopologyService.reloadTopologies(DefaultTopologyService.java:320)

at org.apache.hadoop.gateway.GatewayServer.start(GatewayServer.java:422)

at org.apache.hadoop.gateway.GatewayServer.startGateway(GatewayServer.java:295)

at org.apache.hadoop.gateway.GatewayServer.main(GatewayServer.java:148)

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

at java.lang.reflect.Method.invoke(Method.java:497)

at org.apache.hadoop.gateway.launcher.Invoker.invokeMainMethod(Invoker.java:70)

at org.apache.hadoop.gateway.launcher.Invoker.invoke(Invoker.java:39)

at org.apache.hadoop.gateway.launcher.Command.run(Command.java:99)

at org.apache.hadoop.gateway.launcher.Launcher.run(Launcher.java:69)

at org.apache.hadoop.gateway.launcher.Launcher.main(Launcher.java:46)

2018-07-10 09:55:07,589 ERROR digester3.Digester (Digester.java:parse(1652)) - An error occurred while parsing XML from '(already loaded from stream)', see nested exceptions

org.xml.sax.SAXParseException; lineNumber: 41; columnNumber: 76; The reference to entity "ServiceAccounts" must end with the ';' delimiter.

at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(AbstractSAXParser.java:1239)

at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(SAXParserImpl.java:649)

at org.apache.commons.digester3.Digester.parse(Digester.java:1642)

at org.apache.commons.digester3.Digester.parse(Digester.java:1701)

at org.apache.hadoop.gateway.services.topology.impl.DefaultTopologyService.loadTopologyAttempt(DefaultTopologyService.java:124)

at org.apache.hadoop.gateway.services.topology.impl.DefaultTopologyService.loadTopology(DefaultTopologyService.java:100)

at org.apache.hadoop.gateway.services.topology.impl.DefaultTopologyService.loadTopologies(DefaultTopologyService.java:235)

at org.apache.hadoop.gateway.services.topology.impl.DefaultTopologyService.reloadTopologies(DefaultTopologyService.java:320)

at org.apache.hadoop.gateway.GatewayServer.start(GatewayServer.java:422)

at org.apache.hadoop.gateway.GatewayServer.startGateway(GatewayServer.java:295)

at org.apache.hadoop.gateway.GatewayServer.main(GatewayServer.java:148)

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

at java.lang.reflect.Method.invoke(Method.java:497)

at org.apache.hadoop.gateway.launcher.Invoker.invokeMainMethod(Invoker.java:70)

at org.apache.hadoop.gateway.launcher.Invoker.invoke(Invoker.java:39)

at org.apache.hadoop.gateway.launcher.Command.run(Command.java:99)

2018-07-10 09:55:07,592 ERROR hadoop.gateway (DefaultTopologyService.java:loadTopologies(252)) - Failed to load topology /usr/hdp/2.6.1.0-129/knox/bin/../conf/topologies/sample.xml: org.xml.sax.SAXParseException; lineNumber: 41; columnNumber: 76; The reference to entity "ServiceAccounts" must end with the ';' delimiter.