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| author | Vitaliy <vitaliyf@users.noreply.github.com> | 2023-02-17 14:20:37 +0800 |
|---|---|---|
| committer | maoling <maoling@apache.org> | 2023-02-17 14:20:37 +0800 |
| commit | ac219cef2ad7999fc95c8fd4eb3b945ba37abd43 (patch) | |
| tree | ab6ce7cdccfc29e7c158aac79418e997d169aacf | |
| parent | 2e9c3f3ceda90aeb9380acc87b253bf7661b7794 (diff) | |
| download | zookeeper-ac219cef2ad7999fc95c8fd4eb3b945ba37abd43.tar.gz | |
docs: Minor clarification around globalOutstandingLimit comments
This comment better explain how someone with a typical 3-node ensemble may end up with a 500 limit by default.
The code that "causes" this is here: https://github.com/apache/zookeeper/blob/cedf09370b88b682ae4f7bcd29c683798fa31928/zookeeper-server/src/main/java/org/apache/zookeeper/server/quorum/LeaderZooKeeperServer.java#L166-L170
Author: Vitaliy <vitaliyf@users.noreply.github.com>
Reviewers: maoling <maoling@apache.org>
Closes #1946 from vitaliyf/docs-globaloutstandinglimit-comments
| -rw-r--r-- | zookeeper-docs/src/main/resources/markdown/zookeeperAdmin.md | 12 |
1 files changed, 7 insertions, 5 deletions
diff --git a/zookeeper-docs/src/main/resources/markdown/zookeeperAdmin.md b/zookeeper-docs/src/main/resources/markdown/zookeeperAdmin.md index 636c6cde2..1e317a0b4 100644 --- a/zookeeper-docs/src/main/resources/markdown/zookeeperAdmin.md +++ b/zookeeper-docs/src/main/resources/markdown/zookeeperAdmin.md @@ -620,9 +620,11 @@ property, when available, is noted below. Clients can submit requests faster than ZooKeeper can process them, especially if there are a lot of clients. To prevent ZooKeeper from running out of memory due to queued - requests, ZooKeeper will throttle clients so that there is no - more than globalOutstandingLimit outstanding requests in the - system. The default limit is 1,000. + requests, ZooKeeper will throttle clients so that there are no + more than globalOutstandingLimit outstanding requests across + entire ensemble, equally divided. The default limit is 1,000 + and, for example, with 3 members each of them will have + 1000 / 2 = 500 individual limit. * *preAllocSize* : (Java system property: **zookeeper.preAllocSize**) @@ -635,14 +637,14 @@ property, when available, is noted below. * *snapCount* : (Java system property: **zookeeper.snapCount**) ZooKeeper records its transactions using snapshots and - a transaction log (think write-ahead log).The number of + a transaction log (think write-ahead log). The number of transactions recorded in the transaction log before a snapshot can be taken (and the transaction log rolled) is determined by snapCount. In order to prevent all of the machines in the quorum from taking a snapshot at the same time, each ZooKeeper server will take a snapshot when the number of transactions in the transaction log reaches a runtime generated random value in the \[snapCount/2+1, snapCount] - range.The default snapCount is 100,000. + range. The default snapCount is 100,000. * *commitLogCount* * : (Java system property: **zookeeper.commitLogCount**) |