// from jdk1.8
"If the specified key is not already associated with a value, attempts to
compute its value using the given mapping function and enters it into this map
unless null. The entire method invocation is performed atomically, so the
function is applied at most once per key. Some attempted update operations on
this map by other threads may be blocked while computation is in progress, so
the computation should be short and simple, and must not attempt to update any
other mappings of this map.
"
public V computeIfAbsent(K key, Function<? super K, ? extends V>
mappingFunction) {
The problem may be introduced by this change SOLR-15555
At 2023-01-04 21:06:47, "YangLiu" <[email protected]> wrote:
Maybe this is a jdk “bug”, but it should be used incorrectly.
At 2023-01-04 19:58:35, "slly" <[email protected]> wrote:
>Does anyone have similar problems?
>
>
>The cache class we configured is FastLRUCache in solrconfig.xml
>
>
> <filterCache class="solr.FastLRUCache" size="512" initialSize="512"
> autowarmCount="0"/>
>
>
>Many threads are blocking the stack below:
>
>
> "qtp2141817446-2744893" #2744893 prio=5 os_prio=0 tid=0x00007f0b1b9f4800
> nid=0x3ea9 waiting for monitor entry [0x00007f0b16bdd000]
>
>java.lang.Thread.State: BLOCKED (on object monitor)
>
>at
>java.util.concurrent.ConcurrentHashMap.computeIfAbsent(ConcurrentHashMap.java:1674)
>
>- waiting to lock <0x000000030e8004a8> (a
>java.util.concurrent.ConcurrentHashMap$ReservationNode)
>
>at
>org.apache.solr.util.ConcurrentLRUCache.computeIfAbsent(ConcurrentLRUCache.java:226)
>
>at org.apache.solr.search.FastLRUCache.computeIfAbsent(FastLRUCache.java:259)
>
>at
>org.apache.solr.search.SolrIndexSearcher.getAndCacheDocSet(SolrIndexSearcher.java:876)
>
>at
>org.apache.solr.search.SolrIndexSearcher.getDocSet(SolrIndexSearcher.java:825)
>
>at
>org.apache.solr.search.SolrIndexSearcher.getDocSetBits(SolrIndexSearcher.java:788)
>
>at
>org.apache.solr.search.SolrIndexSearcher.getLiveDocSet(SolrIndexSearcher.java:897)
>
>at org.apache.solr.query.SolrRangeQuery.createDocSet(SolrRangeQuery.java:174)
>
>at org.apache.solr.query.SolrRangeQuery.createDocSet(SolrRangeQuery.java:168)
>
>at org.apache.solr.search.DocSetUtil.createDocSet(DocSetUtil.java:129)
>
>at
>org.apache.solr.search.SolrIndexSearcher.getDocSetNC(SolrIndexSearcher.java:1197)
>
>at
>org.apache.solr.search.SolrIndexSearcher.lambda$getAndCacheDocSet$1(SolrIndexSearcher.java:876)
>
>at
>org.apache.solr.search.SolrIndexSearcher$$Lambda$823/1455346307.apply(Unknown
>Source)
>
>at
>org.apache.solr.search.FastLRUCache.lambda$computeIfAbsent$1(FastLRUCache.java:261)
>
>at org.apache.solr.search.FastLRUCache$$Lambda$824/1183964656.apply(Unknown
>Source)
>
>at
>org.apache.solr.util.ConcurrentLRUCache.lambda$computeIfAbsent$1(ConcurrentLRUCache.java:227)
>
>at
>org.apache.solr.util.ConcurrentLRUCache$$Lambda$825/1107818925.apply(Unknown
>Source)
>
>at
>java.util.concurrent.ConcurrentHashMap.computeIfAbsent(ConcurrentHashMap.java:1660)
>
>- locked <0x0000000310c00220> (a
>java.util.concurrent.ConcurrentHashMap$ReservationNode)
>
>at
>org.apache.solr.util.ConcurrentLRUCache.computeIfAbsent(ConcurrentLRUCache.java:226)
>
>at org.apache.solr.search.FastLRUCache.computeIfAbsent(FastLRUCache.java:259)
>
>at
>org.apache.solr.search.SolrIndexSearcher.getAndCacheDocSet(SolrIndexSearcher.java:876)
>
>at
>org.apache.solr.search.SolrIndexSearcher.getPositiveDocSet(SolrIndexSearcher.java:844)
>
>at
>org.apache.solr.search.SolrIndexSearcher.getProcessedFilter(SolrIndexSearcher.java:1035)
>
>at
>org.apache.solr.search.SolrIndexSearcher.getDocListNC(SolrIndexSearcher.java:1558)
>
>at
>org.apache.solr.search.SolrIndexSearcher.getDocListC(SolrIndexSearcher.java:1439)
>
>at org.apache.solr.search.SolrIndexSearcher.search(SolrIndexSearcher.java:596)
>
>
>
>Thanks.
>
>
>
>
