Merge pull request #85 from status-im/max-open-files

Add max open files limit of 512 to rocksdb init

eth/trie/backends/rocksdb_backend.nim

@@ -7,6 +7,10 @@ type
 
  ChainDB* = RocksChainDB
 
+# Maximum open files for rocksdb, set to 512 to be safe for usual 1024 Linux
+# limit per application
+const maxOpenFiles = 512
+
 proc get*(db: ChainDB, key: openarray[byte]): seq[byte] =
  let s = db.store.getBytes(key)
  if s.ok:
@@ -44,7 +48,8 @@ proc newChainDB*(basePath: string, readOnly = false): ChainDB =
  createDir(dataDir)
  createDir(backupsDir)
 
- let s = result.store.init(dataDir, backupsDir, readOnly)
+ let s = result.store.init(dataDir, backupsDir, readOnly,
+ maxOpenFiles = maxOpenFiles)
  if not s.ok: raiseStorageInitError()
 
  if not readOnly: