Package org.apache.solr.handler.admin

Class ZookeeperStatusHandler

java.lang.Object

org.apache.solr.handler.RequestHandlerBase

org.apache.solr.handler.admin.ZookeeperStatusHandler

All Implemented Interfaces:

AutoCloseable, ApiSupport, SolrInfoBean, NestedRequestHandler, SolrMetricProducer, SolrRequestHandler

public class ZookeeperStatusHandler
extends RequestHandlerBase

Zookeeper Status handler, talks to ZK using sockets and four-letter words

Since:

solr 7.5

Nested Class Summary

Nested classes/interfaces inherited from interface org.apache.solr.core.SolrInfoBean

SolrInfoBean.Category, SolrInfoBean.Group

Field Summary

Fields inherited from class org.apache.solr.handler.RequestHandlerBase

appends, defaults, httpCaching, initArgs, invariants, solrMetricsContext

Fields inherited from interface org.apache.solr.request.SolrRequestHandler

TYPE

Constructor Summary

Constructors

Constructor	Description
ZookeeperStatusHandler(CoreContainer cc)

Method Summary

Modifier and Type	Method	Description
SolrInfoBean.Category	getCategory()	Category of this component
String	getDescription()	Simple one or two line description
protected List<String>	getZkRawResponse(String zkHostPort, String fourLetterWordCommand)	Sends a four-letter-word command to one particular Zookeeper server and returns the response as list of strings
protected Map<String,Object>	getZkStatus(String zkHost, ZkDynamicConfig zkDynamicConfig)	For each zk host, resolved either from zk connection string or from zk dynamic reconfiguration config, fetch all config and status info from ZK API and returns as a map, where key is hostname
void	handleRequestBody(SolrQueryRequest req, SolrQueryResponse rsp)
protected Map<String,Object>	monitorZookeeper(String zkHostPort)
protected boolean	validateZkRawResponse(List<String> response, String zkHostPort, String fourLetterWordCommand)	Takes the raw response lines returned by getZkRawResponse(String, String) and runs some validations

Methods inherited from class org.apache.solr.handler.RequestHandlerBase

getApis, getInitArgs, getMetricNames, getName, getPluginInfo, getRequestHandler, getSolrMetricsContext, getSolrParamsFromNamedList, getSubHandler, handleRequest, init, initializeMetrics, setPluginInfo

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface org.apache.solr.api.ApiSupport

registerV1, registerV2

Methods inherited from interface org.apache.solr.core.SolrInfoBean

getMetricRegistry, getMetricsSnapshot, registerMetricName

Methods inherited from interface org.apache.solr.metrics.SolrMetricProducer

close, initializeMetrics

Constructor Detail

ZookeeperStatusHandler

public ZookeeperStatusHandler(CoreContainer cc)

Method Detail

getDescription

public String getDescription()

Description copied from interface: SolrInfoBean

Simple one or two line description

Specified by:

getDescription in interface SolrInfoBean

Specified by:

getDescription in class RequestHandlerBase

getCategory

public SolrInfoBean.Category getCategory()

Description copied from interface: SolrInfoBean

Category of this component

Specified by:

getCategory in interface SolrInfoBean

Overrides:

getCategory in class RequestHandlerBase

handleRequestBody

public void handleRequestBody(SolrQueryRequest req,
                              SolrQueryResponse rsp)
                       throws Exception

Specified by:

handleRequestBody in class RequestHandlerBase

Throws:

Exception

getZkStatus

protected Map<String,Object> getZkStatus(String zkHost,
                                               ZkDynamicConfig zkDynamicConfig)

For each zk host, resolved either from zk connection string or from zk dynamic reconfiguration config, fetch all config and status info from ZK API and returns as a map, where key is hostname

Parameters:

zkHost - zookeeper connection string

zkDynamicConfig - list of zk dynamic config objects

Returns:

map of zookeeper config and status per zk host

monitorZookeeper

protected Map<String,Object> monitorZookeeper(String zkHostPort)
                                             throws SolrException

Throws:

SolrException

getZkRawResponse

protected List<String> getZkRawResponse(String zkHostPort,
                                        String fourLetterWordCommand)

Sends a four-letter-word command to one particular Zookeeper server and returns the response as list of strings

Parameters:

zkHostPort - the host:port for one zookeeper server to access

fourLetterWordCommand - the custom 4-letter command to send to Zookeeper

Returns:

a list of lines returned from Zookeeper

validateZkRawResponse

protected boolean validateZkRawResponse(List<String> response,
                                        String zkHostPort,
                                        String fourLetterWordCommand)

Takes the raw response lines returned by getZkRawResponse(String, String) and runs some validations

Parameters:

response - the lines

zkHostPort - the host

fourLetterWordCommand - the 4lw command

Returns:

true if validation succeeds

Throws:

SolrException - if validation fails