GitHub user DeyunLuo edited a discussion: when consumer ack message, the
backlog size not reduce, the bookie storage size not release
```bash
1. the backlog-quota use the limitTime
pulsar-admin namespaces get-backlog-quotas bsc/spider
message_age BacklogQuotaImpl(limit=-1, limitSize=-1, limitTime=21600,
policy=consumer_backlog_eviction)
2. not set the retention policy
pulsar-admin namespaces get-retention bsc/spider
{
"retentionTimeInMinutes" : 0,
"retentionSizeInMB" : 0
}
```
3. the pulsar_storage_backlog_size always increase
5. but the pulsar_msg_backlog is always consumer
```bash
6. only have one subscription and use shared
"msgRateIn" : 47.333925891802906,
"msgThroughputIn" : 76108.15232319059,
"msgRateOut" : 101.86800154014381,
"msgThroughputOut" : 168684.02298794116,
"bytesInCounter" : 376920164455,
"msgInCounter" : 1882569,
"bytesOutCounter" : 410604705531,
"msgOutCounter" : 9426464,
"averageMsgSize" : 1607.89858202678,
"msgChunkPublished" : false,
"storageSize" : 116436386186,
"backlogSize" : 116391369788,
"publishRateLimitedTimes" : 0,
"earliestMsgPublishTimeInBacklogs" : 0,
"offloadedStorageSize" : 0,
"lastOffloadLedgerId" : 0,
"lastOffloadSuccessTimeStamp" : 0,
"lastOffloadFailureTimeStamp" : 0,
"ongoingTxnCount" : 0,
"abortedTxnCount" : 0,
"committedTxnCount" : 0,
7. When I use the clear-backlog command, the sotrage size will release
why consumer ack message, but the bookie not release the backlog storage size?
```
GitHub link: https://github.com/apache/pulsar/discussions/21825
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