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Solr plugins

A set of solr plugins that adds additional insight into a running solr.

Memory inspector

A plugin that dumps detailed memory usage statistics of index readers as well as segment details, for all cores. Statistics are also accessible though queryhandler statictics in the solr admin gui.

Installation

Add this to your solrconfig.xml:

<requestHandler name="/memory" class="ae.teletronics.solr.plugin.MemoryInspectorHandler"/>

Usage

Do an http request to a collection, that has the memory inspector mapped. E.g.:

http://<ip>:<port>/solr/<collection>/memory?wt=json&indent=true

return the memory usage as json. If you add dumpToStdOut=true as a parameter, the memory usage is also logged on INFO level. The output looks something like this (depending on your configuration):

Solr cores (count: 2): 20.7 KB
|-- Core 'collection1' (codec: 'HighCompressionCompressingStoredFields', lucene match version: '5.4.0'): 20.7 KB
    |-- Searcher (maxDocs: 20, debugInfo: 'Searcher@34544949[collection1] main{ExitableDirectoryReader(UninvertingDirectoryReader(Uninverting(_a(5.4.0):c10) Uninverting(_b(5.4.0):c1) Uninverting(_c(5.4.0):c1) Uninverting(_d(5.4.0):c1) Uninverting(_e(5.4.0):c1) Uninverting(_f(5.4.0):c1) Uninverting(_g(5.4.0):c1) Uninverting(_h(5.4.0):c1) Uninverting(_i(5.4.0):c1) Uninverting(_j(5.4.0):c1) Uninverting(_l(5.4.0):c1)))}'): 20.7 KB
        |-- ExitableDirectoryReader(UninvertingDirectoryReader(Uninverting(_a(5.4.0):c10) Uninverting(_b(5.4.0):c1) Uninverting(_c(5.4.0):c1) Uninverting(_d(5.4.0):c1) Uninverting(_e(5.4.0):c1) Uninverting(_f(5.4.0):c1) Uninverting(_g(5.4.0):c1) Uninverting(_h(5.4.0):c1) Uninverting(_i(5.4.0):c1) Uninverting(_j(5.4.0):c1) Uninverting(_l(5.4.0):c1))): 20.7 KB
            |-- _a(5.4.0):c10: 2 KB
                |-- postings [PerFieldPostings(segment=_a formats=1)]: 1.5 KB
                    |-- format 'Lucene50_0' [BlockTreeTermsReader(fields=6,delegate=Lucene50PostingsReader(positions=false,payloads=false))]: 1.4 KB
                        |-- field '_version_' [BlockTreeTerms(terms=10,postings=10,positions=-1,docs=10)]: 233 bytes
                            |-- term index [FST(input=BYTE1,output=ByteSequenceOutputs,packed=false]: 73 bytes
                            ...
                        |-- delegate [Lucene50PostingsReader(positions=false,payloads=false)]: 32 bytes
                |-- docvalues [PerFieldDocValues(formats=1)]: 236 bytes
                    |-- format 'Lucene54_0' [Lucene54DocValuesProducer(fields=4)]: 216 bytes
                        |-- direct addresses meta field 's_s1' [org.apache.lucene.util.packed.DirectMonotonicReader$Meta@ccb70fe]: 144 bytes
                |-- stored fields [CompressingStoredFieldsReader(mode=HIGH_COMPRESSION,chunksize=5567)]: 312 bytes
                    |-- stored field index [CompressingStoredFieldsIndexReader(blocks=1)]: 312 bytes
                        |-- doc base deltas: 88 bytes
                        |-- start pointer deltas: 88 bytes
            |-- _b(5.4.0):c1: 1.9 KB
                ...
            |-- _c(5.4.0):c1: 1.9 KB
            ...
|-- Core 'collection2' (codec: 'HighCompressionCompressingStoredFields', lucene match version: '5.4.0'): 0 bytes
    |-- Searcher (maxDocs: 0, debugInfo: 'Searcher@6b7df682[collection2] main{ExitableDirectoryReader(UninvertingDirectoryReader())}'): 0 bytes
        |-- ExitableDirectoryReader(UninvertingDirectoryReader()): 0 bytes

Thread renaming search handler

A search handler that renames the searching thread to the search handler class being executed along with a start timestamp and all query parameters. The actual search is handled by a configurable delegate. A list of running searches is accessible though queryhandler statictics in the solr admin gui.

Installation

Add this to your solrconfig.xml:

    <requestHandler name="/threadrenamingselect" class="ae.teletronics.solr.plugin.ThreadRenamingRequestHandler">
        <str name="delegate">/select</str>
    </requestHandler>

To make thread renaming the default select handler, change the mapping of the default select handler to something else than /select and map ThreadRenamingRequestHandlerto /select instead.

Usage

An example thead name for a simple query could look like this:

org.apache.solr.handler.component.SearchHandler (Start: 03:38:06.599): {q=*:*}

This information will be part of all thread dumps as well as anything else printing thread names - e.g. logging, if configured to print the thread name. A list of all running searches, formatted like above, is available through the solr admin gui as well.