Metrics and use of metrics_idx
by Michael Burman
Hi,
This sparked my interest after the discussions in PR #523 (adding cache to avoid metrics_idx writes). Stefan commented that he still wants to write to this table to keep metrics available instantly, jsanda wants to write them asynchronously. Maybe we should instead just stop writing there?
Why? We do the same thing in tenants also at this time, we don't write there if someone writes a metric to a new tenant. We fetch the partition keys from metrics_idx table. Now, the same ideology could be applied to the metrics_idx writing, read the partition keys from data. There's a small performance penalty, but the main thing is that we don't really need that information often - in most use cases never.
If we want to search something with for example tags, we search it with tags - that metricId has been manually added to the metrics_idx table. No need to know if there's metrics which were not initialized. This should be the preferred way of doing things in any case - use tags instead of pushing metadata to the metricId.
If we need to find out if id exists, fetching that from the PK (PartitionKey) index is fast. The only place where we could slow down is if there's lots of tenants with lots of metricIds each and we want to fetch all the metricIds of a single tenant. In that case the fetching of definitions could slow down. How often do users fetch all the tenant metricIds without any filtering? And how performance critical is this sort of behavior? And what use case does list of ids serve (without any information associated to them) ?
If you need to fetch datapoints from a known metricId, there's no need for metrics_idx table writing or reading. So this index writing only applies to listing metrics.
- Micke
7 years, 9 months
errors when embedding c*
by John Mazzitelli
> We have embedded C* today using the maven 'embeddedc' profile.
> HOWEVER, I can tell you that that still doesn't work quite right
> ...
> some components throw errors at startup and you usually have to
> shutdown the h-server, restart it, and usually (not always) things
> start working again.
Whether we embed C* in -services or in another distro, either way, we have a problem.
I'm sure all of us have seen this at one time or another :)
It seems if I restart the server, most times (not all) I no longer see these errors. I have no idea if this is just going to cause problems in alerts, or if there are other problems we'll see. But I see lots of these kinds of errors:
===========
2016-07-05 11:06:21,747 ERROR [org.jboss.as.ejb3.invocation] (Thread-127 (ActiveMQ-client-global-threads-913106351)) WFLYEJB0034: EJB Invocation failed on component CacheManager for method public java.util.Set org.hawkular.alerts.bus.init.CacheManager.getActiveDataIds(): javax.ejb.ConcurrentAccessTimeoutException: WFLYEJB0241: EJB 3.1 PFD2 4.8.5.5.1 concurrent access timeout on CacheManager - could not obtain lock within 5000MILLISECONDS
...
at org.hawkular.alerts.bus.init.CacheManager$$$view16.getActiveDataIds(Unknown Source)
at org.hawkular.alerts.bus.listener.MetricDataListener.onBasicMessage(MetricDataListener.java:82)
at org.hawkular.alerts.bus.listener.MetricDataListener.onBasicMessage(MetricDataListener.java:50)
at org.hawkular.bus.common.consumer.BasicMessageListener.onBasicMessage(BasicMessageListener.java:77)
at org.hawkular.bus.common.consumer.BasicMessageListener.onMessage(BasicMessageListener.java:63)
...
7 years, 9 months
inventory startup exceptions - but not causing problems
by John Mazzitelli
Lukas:
https://paste.fedoraproject.org/387177/14673904/
I see several of these inventory warnings in my agent itests - all my tests pass, so its not causing any problems that I can see. But just wanted to point it out. Seems to happen at startup?
-------
12:25:28,470 WARN [org.hawkular.inventory.rest] (default task-9) RestEasy exception, : java.lang.IllegalStateException: Transaction already open.
at org.hawkular.inventory.impl.tinkerpop.spi.GraphProvider.startTransaction(GraphProvider.java:93)
at org.hawkular.inventory.impl.tinkerpop.InventoryContext.startTransaction(InventoryContext.java:55)
at org.hawkular.inventory.impl.tinkerpop.TinkerpopBackend.startTransaction(TinkerpopBackend.java:125)
at org.hawkular.inventory.base.TransactionConstructor.lambda$startInBackend$88(TransactionConstructor.java:40)
at org.hawkular.inventory.base.TraversalContext.startTransaction(TraversalContext.java:339)
at org.hawkular.inventory.base.TraversalContext.startTransaction(TraversalContext.java:335)
at org.hawkular.inventory.base.Util.inCommittableTx(Util.java:76)
at org.hawkular.inventory.base.Traversal.inCommittableTx(Traversal.java:105)
at org.hawkular.inventory.base.Traversal.inTx(Traversal.java:96)
at org.hawkular.inventory.base.Traversal.inTx(Traversal.java:79)
at org.hawkular.inventory.base.Fetcher.loadEntity(Fetcher.java:72)
at org.hawkular.inventory.base.Fetcher.entity(Fetcher.java:55)
at org.hawkular.inventory.base.Fetcher.entity(Fetcher.java:39)
at org.hawkular.inventory.api.ResolvableToSingle.exists(ResolvableToSingle.java:52)
at org.hawkular.inventory.rest.cdi.AutoTenantInventoryProducer$AutotenantInventory$2.get(AutoTenantInventoryProducer.java:150)
at org.hawkular.inventory.rest.cdi.AutoTenantInventoryProducer$AutotenantInventory$2.get(AutoTenantInventoryProducer.java:141)
at org.hawkular.inventory.rest.RestTenant.get(RestTenant.java:54)
at org.hawkular.inventory.rest.RestTenant$Proxy$_$$_WeldClientProxy.get(Unknown Source)
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.jboss.resteasy.core.MethodInjectorImpl.invoke(MethodInjectorImpl.java:139)
at org.jboss.resteasy.core.ResourceMethodInvoker.invokeOnTarget(ResourceMethodInvoker.java:295)
at org.jboss.resteasy.core.ResourceMethodInvoker.invoke(ResourceMethodInvoker.java:249)
at org.jboss.resteasy.core.ResourceMethodInvoker.invoke(ResourceMethodInvoker.java:236)
at org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:395)
at org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:202)
at org.jboss.resteasy.plugins.server.servlet.ServletContainerDispatcher.service(ServletContainerDispatcher.java:221)
at org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher.service(HttpServletDispatcher.java:56)
at org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher.service(HttpServletDispatcher.java:51)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)
at io.undertow.servlet.handlers.ServletHandler.handleRequest(ServletHandler.java:85)
at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:129)
at io.undertow.websockets.jsr.JsrWebSocketFilter.doFilter(JsrWebSocketFilter.java:129)
at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:60)
at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131)
at io.undertow.servlet.handlers.FilterHandler.handleRequest(FilterHandler.java:84)
at io.undertow.servlet.handlers.security.ServletSecurityRoleHandler.handleRequest(ServletSecurityRoleHandler.java:62)
at io.undertow.servlet.handlers.ServletDispatchingHandler.handleRequest(ServletDispatchingHandler.java:36)
at org.wildfly.extension.undertow.security.SecurityContextAssociationHandler.handleRequest(SecurityContextAssociationHandler.java:78)
at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
at io.undertow.servlet.handlers.security.SSLInformationAssociationHandler.handleRequest(SSLInformationAssociationHandler.java:131)
at io.undertow.servlet.handlers.security.ServletAuthenticationCallHandler.handleRequest(ServletAuthenticationCallHandler.java:57)
at io.undertow.server.handlers.DisableCacheHandler.handleRequest(DisableCacheHandler.java:33)
at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
at io.undertow.security.handlers.AuthenticationConstraintHandler.handleRequest(AuthenticationConstraintHandler.java:51)
at io.undertow.security.handlers.AbstractConfidentialityHandler.handleRequest(AbstractConfidentialityHandler.java:46)
at io.undertow.servlet.handlers.security.ServletConfidentialityConstraintHandler.handleRequest(ServletConfidentialityConstraintHandler.java:64)
at io.undertow.servlet.handlers.security.ServletSecurityConstraintHandler.handleRequest(ServletSecurityConstraintHandler.java:56)
at io.undertow.security.handlers.AuthenticationMechanismsHandler.handleRequest(AuthenticationMechanismsHandler.java:60)
at io.undertow.servlet.handlers.security.CachedAuthenticatedSessionHandler.handleRequest(CachedAuthenticatedSessionHandler.java:77)
at io.undertow.security.handlers.NotificationReceiverHandler.handleRequest(NotificationReceiverHandler.java:50)
at io.undertow.security.handlers.AbstractSecurityContextAssociationHandler.handleRequest(AbstractSecurityContextAssociationHandler.java:43)
at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
at org.wildfly.extension.undertow.security.jacc.JACCContextIdHandler.handleRequest(JACCContextIdHandler.java:61)
at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
at io.undertow.servlet.handlers.ServletInitialHandler.handleFirstRequest(ServletInitialHandler.java:284)
at io.undertow.servlet.handlers.ServletInitialHandler.dispatchRequest(ServletInitialHandler.java:263)
at io.undertow.servlet.handlers.ServletInitialHandler.access$000(ServletInitialHandler.java:81)
at io.undertow.servlet.handlers.ServletInitialHandler$1$1.run(ServletInitialHandler.java:180)
at java.security.AccessController.doPrivileged(Native Method)
at io.undertow.servlet.handlers.ServletInitialHandler$1.handleRequest(ServletInitialHandler.java:177)
at io.undertow.server.Connectors.executeRootHandler(Connectors.java:202)
at io.undertow.server.HttpServerExchange$1.run(HttpServerExchange.java:793)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
Caused by: org.hawkular.inventory.impl.tinkerpop.spi.NoRecordedStacktrace
7 years, 10 months
List of endpoints in components
by Lukas Krejci
Due to a bug in the listing of endpoints in inventory (something I never
really paid attention to, because it seemed like this was autogenerated from
Resteasy metadata) I started thinking about what is actually returned from
that endpoint.
The format is somewhat spartan:
[{"uri": "...", "methods": ["GET", "POST", ...]}, ...]
Now during the build, all the Hawkular components use something much more
complete and elaborate - the swagger.json - which we use to generate the API
documentation for hawkular.org.
I think it would be much better if the endpoint listing actually returned the
swagger.json instead of the above format lacking much of the information
available in swagger.
What do you think?
This would obviously break the current users but would be much more helpful
for API consumers given the richness of the swagger format and the amount of
information we include.
--
Lukas Krejci
7 years, 10 months
