Minor Description
If a shard recovers via replication (vs PeerSync) a file named replication.properties gets created. If the same shard recovers once more via replication, IndexFetcher fails to write latest replication information as it tries to create replication.properties but as file already exists. Here is the stack trace I saw
java.nio.file.FileAlreadyExistsException: <solr_home>\shard-3-001\cores\collection1\data\replication.properties
at sun.nio.fs.WindowsException.translateToIOException(Unknown Source)
at sun.nio.fs.WindowsException.rethrowAsIOException(Unknown Source)
at sun.nio.fs.WindowsException.rethrowAsIOException(Unknown Source)
at sun.nio.fs.WindowsFileSystemProvider.newByteChannel(Unknown Source)
at java.nio.file.spi.FileSystemProvider.newOutputStream(Unknown Source)
at java.nio.file.Files.newOutputStream(Unknown Source)
at org.apache.lucene.store.FSDirectory$FSIndexOutput.<init>(FSDirectory.java:413)
at org.apache.lucene.store.FSDirectory$FSIndexOutput.<init>(FSDirectory.java:409)
at org.apache.lucene.store.FSDirectory.createOutput(FSDirectory.java:253)
at org.apache.solr.handler.IndexFetcher.logReplicationTimeAndConfFiles(IndexFetcher.java:689)
at org.apache.solr.handler.IndexFetcher.fetchLatestIndex(IndexFetcher.java:501)
at org.apache.solr.handler.IndexFetcher.fetchLatestIndex(IndexFetcher.java:265)
at org.apache.solr.handler.ReplicationHandler.doFetch(ReplicationHandler.java:397)
at org.apache.solr.cloud.RecoveryStrategy.replicate(RecoveryStrategy.java:157)
at org.apache.solr.cloud.RecoveryStrategy.doRecovery(RecoveryStrategy.java:409)
at org.apache.solr.cloud.RecoveryStrategy.run(RecoveryStrategy.java:222)
at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)
at java.util.concurrent.FutureTask.run(Unknown Source)
at org.apache.solr.common.util.ExecutorUtil$MDCAwareThreadPoolExecutor.lambda$0(ExecutorUtil.java:229)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
