Issue

When you have a multi-node AEM + MongoDB cluster and you shut down the MongoDB primary node and allow failover, then AEM throws errors on all cluster nodes.

Environment

AEM 6.2 + Oak 1.4.15 or earlier

Cause

This is a known issue with AEM + Oak 1.4.15 (and earlier Oak versions).

Resolution

  1. Update to Oak 1.4.16 or later Oak version as provided here.

  2. Set socketTimeoutMS=60000 in the mongouri, for example:

    #mongodb connection options
    CQ_JVM_OPTS="${CQ_JVM_OPTS} -Doak.documentMK.maxServerTimeDiffMillis=31000 -Doak.mongo.uri=mongodb://aemuser:redacted@mongo1host:27017,mongo2host:27017,mongo3host:27017/aem-author?authsource=aem-author&authMechanism=MONGODB-CR&replicaSet=aem&readPreference=nearest&w=2&socketTimeoutMS=60000 -Doak.mongo.db=aem-author"
  3. Add socketKeepAlive=true in DocumentNodeStoreService configuration. For example:

    # This file contains DocumentNodeStoreService configurations and information relating to the apps connection to the Mongo DB
    customBlobStore=B"true"
    maxReplicationLagInSecs=L"21600"
    blobCacheSize=I"16"
    cache=I"16384"
    cacheSegmentCount=I"16"
    cacheStackMoveDistance=I"16"
    nodeCachePercentage="50"
    prevDocCachePercentage="10"
    childrenCachePercentage="20"
    diffCachePercentage="15"
    docChildrenCachePercentage="2"
    persistentCache="./crx-quickstart/repository/cache,size\=2048,binary\=0"
    journalGCInterval=L"300000"
    journalGCMaxAge=L"21600000"
    journalGcBatchSize=I"100"
    blobGcMaxAgeInSecs=L"86400"
    socketKeepAlive=B"true"

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