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new acde49c349 Make AutoRecovery enable stickyReadS as default. (#4125)
acde49c349 is described below
commit acde49c349b6856f25ab0b00ef50412b844182a0
Author: Yan Zhao <[email protected]>
AuthorDate: Thu Nov 9 19:05:21 2023 +0800
Make AutoRecovery enable stickyReadS as default. (#4125)
### Motivation
The AutoRecovery would move the data to another alive bookie to ensure the
data replicas. So it will read data from the alive bookie at the ensemble, then
write the data to the new bookie.
When reading data, it will choose the bookie in the ensemble randomly, so
it may choose the bookie that may be already shut down, and then print many
warm logs.
If we make stickyReadSEnabled=true, it will read the data from the alive
bookie continually, and won't print any warm log, and the stickyReadS can
improve hit rate of the bookie server read cache, speed the read operation.
---
conf/bk_server.conf | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)
diff --git a/conf/bk_server.conf b/conf/bk_server.conf
index 408f8ac4c0..79e10f5851 100755
--- a/conf/bk_server.conf
+++ b/conf/bk_server.conf
@@ -617,7 +617,7 @@ ledgerDirectories=/tmp/bk-data
gcEntryLogMetadataCacheEnabled=false
# Directory to persist Entrylog metadata if
gcPersistentEntrylogMetadataMapEnabled is true
-# [Default: it creates a sub-directory under a first available base ledger
directory with
+# [Default: it creates a sub-directory under a first available base ledger
directory with
# name "entrylogIndexCache"]
# gcEntryLogMetadataCachePath=
@@ -918,7 +918,7 @@ zkEnableSecurity=false
# latency stats rollover interval, in seconds
# prometheusStatsLatencyRolloverSeconds=60
-# Expose the default JVM Metrics or not. If you are using the BookKeeper as an
embedded service and you want to
+# Expose the default JVM Metrics or not. If you are using the BookKeeper as an
embedded service and you want to
# expose metrics in your application, you might need to disable this to avoid
the JVM metrics register duplicated.
# exposeDefaultJVMMetrics=true
@@ -1054,6 +1054,9 @@ zkEnableSecurity=false
# The number of entries that a replication will rereplicate in parallel.
# rereplicationEntryBatchSize=10
+# Enable/disable having read operations for a ledger to be sticky to a single
bookie.
+stickyReadSEnabled=true
+
# The grace period, in milliseconds, that the replication worker waits before
fencing and
# replicating a ledger fragment that's still being written to upon bookie
failure.
# openLedgerRereplicationGracePeriod=30000
